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Filed Pursuant to Rule 424(b)(4)
Registration No. 333-205217

17,900,000 Shares
SUNRUN
Common Stock
This is an initial public offering of shares of common stock of Sunrun Inc. 17,482,268 shares of common stock are being sold by us and 417,732 shares of common stock are being sold by the selling stockholders identified in this prospectus. We will not receive any of the proceeds from the sale of the shares being sold by the selling stockholders.
Prior to this offering, there has been no public market for shares of our common stock. The initial public offering price of the common stock is $14.00. We have been approved to list our common stock on the NASDAQ Global Select Market under the symbol “RUN.”
The underwriters have the option to purchase up to 2,335,000 additional shares from us and 350,000 additional shares from the selling stockholders identified in this prospectus to cover over-allotments of shares.
We are an “emerging growth company” as defined under the federal securities laws and, as such, are subject to reduced public company reporting requirements.
See “Risk Factors” beginning on page 14 to read about factors you should consider before buying shares of our common stock.
Price to
Public
Underwriting
Discounts and
Commissions(1)
Proceeds to
Issuer
Proceeds to
Selling
Stockholders
Per share $14.00 $0.91 $13.09 $13.09
Total $250,600,000 $16,289,000 $228,842,888 $5,468,112
(1) See “Underwriting” for a description of the compensation payable to the underwriters.
Delivery of the shares of common stock will be made on or about August 10, 2015.
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
Credit Suisse Goldman, Sachs & Co. Morgan Stanley
BofA Merrill Lynch RBC Capital Markets
KeyBanc Capital Markets SunTrust Robinson Humphrey
The date of this prospectus is August 4, 2015

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GOING SOLAR WITH SUNRUN IS SIMPLE.
Sunrun handles everything—we design, install, finance, insure, monitor and maintain the solar panels while our customers simply pay for electricity at a lower rate than their utility.
“We absolutely LOVE our solar! We brag about our low bills to our friends, telling them they should do it...and wave and smile to our neighbors
who have it now too! We could not be happier!”
Artem & Jill B.
Nevada
Hawaii
Arizona
California
Colorado
Oregon
“I came into contact with Sunrun through [their retail partner]. And when this partner teams up with a company the service, quality, and value of that company is very high.”
Ryan L.
“I’m very happy with Sunrun. It’s so easy to live with! I like that Sunrun maintains my system, and I don’t have to worry about it. Their service agreement made a lot of sense and has saved me a lot of money.”
John D.
New jersey
Massachusetts
OUR CUSTOMERS LOCK-IN LONG TERM SAVINGS.
While they sit back and enjoy the savings, we take care of the system throughout the lifetime of the agreement—for no additional cost.

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We have not, and the selling stockholders have not, authorized anyone to provide any information or make any representations other than those contained in this prospectus or in any free writing prospectus prepared by or on behalf of us or to which we have referred you. We and the selling stockholders take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. We and the selling stockholders are offering to sell, and seeking offers to buy, shares of our common stock only in jurisdictions where offers and sales are permitted. The information contained in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or of any sale of our common stock.

Through and including August 29, 2015 (the 25th day after the date of this prospectus), all dealers effecting transactions in these securities, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to a dealer’s obligation to deliver a prospectus when acting as an underwriter and with respect to an unsold allotment or subscription.

For investors outside of the United States: Neither we, the selling stockholders nor any of the underwriters have done anything that would permit this offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. You are required to inform yourselves about and to observe any restrictions relating to this offering and the distribution of this prospectus outside of the United States.

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RISK FACTORS

Investing in our common stock involves a high degree of risk. You should carefully consider the risks and uncertainties described below, together with all of the other information in this prospectus, including the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes, before making a decision to invest in our common stock. The risks and uncertainties described below may not be the only ones we face. If any of the risks actually occur, our business, financial condition, results of operations, cash flows and prospects could be materially and adversely affected. In that event, the market price of our common stock could decline, and you could lose part or all of your investment.

Risks Related to Our Business and Our Industry

We need to raise capital to finance the continued growth of our residential solar service business. If capital is not available to us on acceptable terms, as and when needed, our business and prospects would be materially and adversely impacted.

Our future success depends on our ability to raise capital from third parties to grow our business. To date, we have funded our business principally through low-cost tax equity investment funds. If we are unable to establish new investment funds when needed, or upon desirable terms, the growth of our solar service business would be impaired.

The contract terms in certain of our existing investment fund documents contain various conditions with respect to our ability to draw on financing commitments from the fund investors, including conditions that restrict our ability to draw on such commitments if an event occurs that could reasonably be expected to have a material adverse effect on the fund or, in some instances, us. If we were not able to satisfy such conditions due to events related to our business, a specific investment fund, developments in our industry, including tax or regulatory changes, or otherwise, and as a result, we were unable to draw on existing funding commitments, we could experience a material adverse effect on our business, liquidity, financial condition, results of operations and prospects. If any of the investors that currently invest in our investment funds were to decide not to invest in future investment funds to finance our solar service offerings due to general market conditions, concerns about our business or prospects or any other reason, or materially change the terms under which they were willing to provide future financing, we would need to identify new investors to invest in our investment funds and our cost of capital may increase.

There can be no assurance that we will be able to continue to successfully access capital in a manner that supports the growth of our business. Certain sources of capital may not be available in the future, and competition for any available funding may increase. We cannot be sure that we will be able to maintain necessary levels of funding without incurring high funding costs, unfavorable changes in the terms of funding instruments or the liquidation of certain assets. If we were unable to continue to offer a competitive investment profile, we may lose access to these funds or they may only be available on less favorable terms than those provided to our competitors or currently provided to us. If we were to be unable to arrange new or alternative methods of financing on favorable terms, our business, financial condition, results of operations and prospects could be materially and adversely affected.

The solar energy industry is an emerging market that is constantly evolving and may not develop to the size or at the rate we expect.

The solar energy industry is an emerging and constantly evolving market opportunity. We believe the solar energy industry will take several years to fully develop and mature, and we cannot be certain that the market will grow at the rate we expect. Any future growth of the solar energy market and the success of our solar service offerings depend on many factors beyond our control, including recognition and acceptance of the solar service market by consumers, the pricing of alternative sources of energy and our ability to provide our solar service

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offerings cost effectively. If the markets for solar energy do not develop at the rate we expect, our business may be adversely affected. Solar energy has yet to achieve broad market acceptance and depends in part on continued support in the form of rebates, tax credits and other incentives from federal, state and local governments. If this support diminishes, our ability to obtain external financing on acceptable terms, or at all, could be materially adversely affected. Such funding limitations could lead to inadequate financing support for the anticipated growth in our business. Furthermore, growth in residential solar energy depends in part on macroeconomic conditions, retail prices of electricity and homeowner preferences, each of which can change quickly. Declining macroeconomic conditions, including in the job markets and residential real estate markets, could contribute to instability and uncertainty among homeowners and impact their financial wherewithal, credit scores or interest in entering into long-term contracts, even if such contracts would generate immediate and long-term savings. Market prices of retail electricity generated by utilities or other energy sources could decline for a variety of reasons, as discussed further below. Any such declines in macroeconomic conditions or changes in homeowner preferences would adversely impact our business.

Our ability to provide our solar service offerings to homeowners on an economically viable basis depends in part on our ability to finance these systems with fund investors who seek particular tax and other benefits.

Our solar service offerings have been eligible for federal investment tax credits (“ITCs”), U.S. Treasury grants and other tax benefits. We have relied on, and will continue to rely on, tax equity investment funds, which are financing structures that monetize a substantial portion of those benefits, in order to finance our solar service offerings. If, for any reason, we were unable to continue to monetize those benefits through these arrangements, we may be unable to provide and maintain our solar service offerings for homeowners on an economically viable basis.

The availability of this tax-advantaged financing depends upon many factors, including:

The federal government currently offers a 30% ITC (the “Commercial ITC”) under Section 48(a) of the Internal Revenue Code of 1986, as amended (the “Code”), for the installation of certain solar power facilities prior to December 31, 2016, for taxpayers using solar property in a trade or business. This Commercial ITC will be, pursuant to current law, reduced from approximately 30% of the fair market value of the solar energy systems to approximately 10% for solar energy systems placed in service after December 31, 2016. The Commercial ITC reductions will reduce the amount we can monetize pursuant to investment fund structures. Moreover, potential investors must remain satisfied that the funding structures that we offer will make the tax benefits associated with solar energy systems available to these investors, which depends both on the investors’ assessment of the tax law and the absence of any unfavorable interpretations of that law. Adverse changes in existing law or interpretations of existing law by the Internal Revenue Service (the “IRS”) and the courts could reduce the willingness of investors to invest in funds associated with these solar energy systems. Accordingly, we cannot assure you that this type of financing will continue to be available to us. New investment fund structures or other financing mechanisms may also become available, and if we are unable to take advantage of these fund structures and financing mechanisms, we may be at a competitive disadvantage. If, for any reason, we were unable to finance our solar service offerings through tax-advantaged structures or if we were unable to realize or monetize Commercial ITCs or other tax benefits, we may no longer be able to provide our solar service offerings to new homeowners on an economically viable basis, which would have a material adverse effect on our business, financial condition and results of operations.

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We have historically benefited from declining costs in our industry, and our business and financial results may be harmed as a result of increases in costs associated with our solar service offerings. If we do not reduce our cost structure in the future, our ability to become profitable may be impaired.

Declining costs related to raw materials, manufacturing and the sale and installation of our solar service offerings has been a key driver in the pricing of our solar service offerings and, more broadly, homeowner adoption of solar energy. While historically the prices of solar panels and raw materials have declined, the cost of solar panels and raw materials could increase in the future due a variety of factors, including trade barriers, export regulations, regulatory or contractual limitations, industry market requirements and changes in technology and industry standards. Any such increases could slow our growth and cause our financial results and operational metrics to suffer. For example, in the past, we and our solar partners purchased a significant portion of the solar panels used in our solar service offerings from manufacturers based in China or such panels have contained components from China. The U.S. government has imposed antidumping and countervailing duties on solar cells manufactured in China. In addition, we may face other increases in our operating expense, including increases in wages or other labor costs, as well as marketing, sales or branding related costs. In addition, we invested heavily in building our direct-to-consumer capabilities in 2014 after our acquisition of MEC. These investments included significantly increasing our installation capacity through the opening of new branches, increasing our hiring in construction and in associated management personnel, and increasing brand and sales and marketing expenses. We may continue to make significant investments to drive growth in the future. Increases in any of these costs could adversely affect our results of operations and financial condition and harm our business and prospects. If we are unable to reduce our cost structure in the future, we may not be able to achieve profitability, which could have a material adverse effect on our business and prospects.

Electric utility statutes and regulations and changes to statutes or regulations may present technical, regulatory and economic barriers to the purchase and use of our solar service offerings that may significantly reduce demand for such offerings.

Federal, state, and local government statutes and regulations concerning electricity heavily influence the market for our solar service offerings. These statutes and regulations relate to electricity pricing, net metering, incentives, taxation, competition with utilities, and the interconnection of homeowner-owned and third party-owned solar energy systems to the electrical grid. These statutes and regulations are constantly evolving. Governments, often acting through state utility or public service commissions, change and adopt different rates for residential customers on a regular basis and these changes can have a negative impact on our ability to deliver savings to homeowners.

Utilities, their trade associations, and fossil fuel interests in the country, each of which has significantly greater economic and political resources than the residential solar industry, are currently challenging solar-related policies to reduce the competitiveness of residential solar energy. Any adverse changes in solar-related policies could have a negative impact on our business and prospects.

We face competition from traditional energy companies as well as solar energy companies.

The solar energy industry is highly competitive and continually evolving as participants strive to distinguish themselves within their markets and compete with large utilities. We believe that our primary competitors are the established utilities that supply energy to homeowners by traditional means. We compete with these utilities primarily based on price, predictability of price, and the ease by which homeowners can switch to electricity generated by our solar service offerings. If we cannot offer compelling value to homeowners based on these factors, then our business and revenues will not grow. Utilities generally have substantially greater financial, technical, operational and other resources than we do. As a result of their greater size, these competitors may be able to devote more resources to the research, development, promotion and sale of their products or respond more quickly to evolving industry standards and changes in market conditions than we can. Furthermore, these competitors are able to devote substantially more resources and funding to regulatory and lobbying efforts.

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Utilities could also offer other value-added products or services that could help them compete with us even if the cost of electricity they offer is higher than ours. In addition, a majority of utilities’ sources of electricity are non- solar, which may allow utilities to sell electricity more cheaply than us. In addition, regulated utilities are increasingly seeking approval to ‘rate-base’ their own residential solar businesses. Rate-basing means that utilities would receive guaranteed rates of return for their solar businesses. This is already commonplace for utility scale solar projects and commercial solar projects. While few utilities to date have received regulatory permission to rate base residential solar, our competitiveness would be significantly harmed should more utilities receive such permission because we do not receive guaranteed profits for our solar service offerings.

We also face competition from other residential solar service providers. Some of these competitors have a higher degree of brand name recognition, differing business and pricing strategies, and greater capital resources than we have and have extensive knowledge of our target markets. If we are unable to establish or maintain a consumer brand that resonates with homeowners, or compete with the pricing offered by our competitors, our sales and market share position may be adversely affected as our growth is dependent on originating new homeowners. We may also face competitive pressure from companies who offer lower priced consumer offerings than us.

We also compete with companies that are not regulated like traditional utilities but that have access to the traditional utility electricity transmission and distribution infrastructure. These energy service companies are able to offer homeowners electricity supply-only solutions that are competitive with our solar service offerings on both price and usage of solar energy technology while avoiding the long-term agreements and physical installations that our current fund-financed business model requires. This may limit our ability to attract homeowners, particularly those who wish to avoid long-term contracts or have an aesthetic or other objection to putting solar panels on their roofs.

We also face competition from purely finance-driven nonintegrated competitors that subcontract out the installation of solar energy systems, from installation businesses (including solar partners) that seek financing from external parties, from large construction companies and from electrical and roofing companies. In addition, local installers that might otherwise be viewed as potential solar partners may gain market share by being able to be first providers in new local markets. Some of these competitors may provide energy at lower costs than we do.

As the solar industry grows and evolves, we will also face new competitors who are not currently in the market, as well as existing and new competitors that achieve significant developments in alternative technologies or new products such as storage solutions, loan products or other programs related to third-party ownership. Our failure to adapt to changing market conditions, to compete successfully with existing or new competitors and to adopt new or enhanced technologies could limit our growth and have a material adverse effect on our business and prospects.

Regulations and policies related to rate design could deter potential homeowners from purchasing our solar service offerings, reduce the value of the electricity we produce, and reduce the savings that our homeowners could realize from our solar service offerings.

All states regulate investor-owned utility retail electricity pricing. In addition, there are numerous publicly owned utilities and electric cooperatives that establish their own retail electricity pricing through some form of regulation or internal process. These regulations and policies could deter potential homeowners from purchasing our solar service offerings. For example, utilities are seeking rate design changes to “de-couple” rates. This form of “de-coupling” means changing rates to charge lower volume-based rates, or the rates charged for kilowatt hour of electricity purchased by a residential customer, and higher unavoidable fixed charges that a homeowner is subject to when they purchase solar energy from third parties. This form of rate design would adversely impact our business by reducing the value of the electricity our solar energy systems produce and reducing the savings homeowners receive by purchasing our solar service offerings. In addition to changes in general rates charged to all residential customers, utilities are increasingly seeking solar-specific charges (which may be fixed charges,

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capacity-based charges, or other rate changes). Any of these changes could materially reduce the demand for our products and could limit the number of markets in which our products are competitive with electricity provided by the utilities.

We rely on net metering and related policies to offer competitive pricing to homeowners in all of our current markets, and changes to net metering policies may significantly reduce demand for electricity from our solar service offerings.

As of March 31, 2015, a substantial majority of states have adopted net metering policies, including each of the states where we currently serve homeowners. Net metering policies provide homeowners with a one-for-one full retail credit within a monthly billing period for electricity that the solar energy system exports to the electric grid. At the end of the monthly billing period, if the homeowner has generated excess electricity within that month, the homeowner typically carries forward a credit for any excess electricity to be offset against future utility purchases. While the value of credits carried forward from month to month varies from state to state, all intra-month credits are at the full retail rate. At the end of an annual billing period or calendar year, utilities either continue to carry forward a credit, or reconcile the homeowner’s final annual or calendar year bill using different rates (including zero credit) for the exported electricity.

Utilities, their trade associations, and fossil fuel interests in the country are currently challenging net metering policies, and seeking to either eliminate it, cap it, or impose charges on homeowners that have adopted net metering. Some states, including California, currently set limits on the total percentage of a utility’s customers that can adopt net metering. Maryland, Nevada and New York also have metering caps and other states we serve now or in the future may adopt metering caps. If the net metering caps in California or other jurisdictions are reached without an expansion of net metering policies, homeowners in the future will be unable to recognize the cost savings associated with net metering they currently enjoy. Of the states in which we offer our solar service offerings, only Nevada is expected to reach its cap within the next 12 months unless the cap is increased. We currently expect Nevada to reach its cap in the next month unless it is increased. However, legislation has been adopted that requires that an uncapped program approved by the Nevada Public Utilities Commission be implemented in Nevada no later than December 31, 2015. If changes to net metering policies occur without grandfathering to existing homeowners, those existing homeowners could be negatively impacted which could create a default risk from those homeowners. Our ability to sell our solar service offerings may be adversely impacted by the failure to expand existing limits to net metering. The failure to adopt a net metering policy where it currently is not in place would pose a barrier to entry in those states. Additionally, the imposition of charges that only or disproportionately impact homeowners that utilize net metering would adversely impact our business.

Our business currently depends on the availability of utility rebates, tax credits and other financial incentives in addition to other tax benefits. The expiration, elimination or reduction of these rebates and incentives could adversely impact our business.

U.S. federal, state and local governmental bodies provide incentives to owners, distributors, installers and manufacturers of solar energy systems to promote solar energy. These incentives include ITCs, as discussed above, as well as other tax credits, rebates and other financial incentives, such as system performance payments and payments for solar renewable energy credits (“SRECs”) associated with solar energy generation. We rely on these incentives to lower our cost of capital and to incent investors to invest in our funds, all of which enables us to lower the price we charge homeowners for our solar service offerings. However, these incentives may expire on a particular date (as discussed above with respect to ITCs), end when the allocated funding is exhausted, or be reduced or terminated without notice. The financial value of certain incentives may also decrease over time. For example, the values of SRECs are volatile and could decrease over time as the supply of SREC-producing solar energy systems installed in a particular market increases. We monetize SRECs through forward sales. If we are unable to deliver these contracted SRECs, we may be required to make up the shortfall of SRECs through purchases on the open market or make payments of liquidated damages.

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Our business model also relies on multiple tax exemptions offered at the state and local levels. For example, solar energy systems are generally not considered in determining values for calculation of local and state real and personal property taxes as a result of applicable property tax exemptions. If solar energy systems were not excluded, the property taxes payable by homeowners would be higher, which could offset any potential savings our solar service offerings could offer. For example, in the state of Arizona, the Arizona Department of Revenue has determined that a personal property tax exemption on solar panels does not apply to solar panels that are leased (as opposed to owned), such that leased panels in Arizona may ultimately subject the homeowner to an increase in personal property taxes and this increased personal property tax could reduce or eliminate entirely the savings that these solar panels would otherwise provide to the homeowner. Although we are involved in ongoing litigation challenging the Arizona personal property tax determination, there can be no assurances that this litigation will be resolved in a manner that is favorable to us or other solar companies. If this litigation is not resolved in a manner that is favorable to us and other solar companies, and we pass the tax cost on to our customers, it will adversely impact our ability to attract new customers in Arizona, and the savings that our current Arizona customers realize will be reduced by the additional tax imposed, which will make our solar service offerings less attractive to those customers and could increase the risk of default from those customers. In addition, we rely on certain state and local tax exemptions that apply to the sale of equipment, sale of power, or both. These state and local sales tax exemptions can be changed by the state legislature and other regulators, and such a change could adversely impact our business.

We are not currently regulated as a utility under applicable laws, but we may be subject to regulation as a utility in the future or become subject to new federal and state regulations for any additional solar service offerings we may introduce in the future.

Federal, state, and municipal laws do not currently regulate us as a utility. As a result, we are not subject to the various regulatory requirements applicable to U.S. utilities. However, any federal, state, local or otherwise applicable regulations could place significant restrictions on our ability to operate our business and execute our business plan by prohibiting or otherwise restricting our sale of electricity. These regulatory requirements could include restricting our sale of electricity, as well as regulating the price of our solar service offerings. If we were subject to the same regulatory authorities as utilities in the United States or if new regulatory bodies were established to oversee our business, then our operating costs could materially increase.

Our business depends in part on the regulatory treatment of third-party owned solar energy systems.

Our customer agreements are third-party ownership arrangements. Sales of electricity by third parties face regulatory challenges in some states and jurisdictions. These challenges pertain to issues such as whether third-party-owned systems qualify for the same levels of rebates or other non-tax incentives available for homeowner-owned solar energy systems, whether third-party-owned systems are eligible at all for these incentives, and whether third-party-owned systems are eligible for net metering and the associated significant cost savings. Reductions in, or eliminations of, the current treatment of third-party arrangements could reduce demand for our solar service offerings, adversely impact our access to capital and cause us to increase the price we charge homeowners for energy.

Interconnection limits or circuit-level caps imposed by regulators may significantly reduce our ability to sell electricity from our solar service offerings in certain markets or slow interconnections, harming our growth rate and customer satisfaction scores.

Interconnection rules establish the circumstances in which rooftop solar will be connected to the electricity grid. Interconnection limits or circuit-level caps imposed by regulators may curb our growth in key markets. Utilities throughout the country have different rules and regulations regarding interconnection and some utilities cap or limit the amount of solar energy that can be interconnected to the grid. Our systems do not provide power to homeowners until they are interconnected to the grid. The vast majority of our current homeowners are connected to the grid, and we expect homeowners to continue to be connected to the grid in the future.

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Interconnection regulations are based on claims from utilities regarding the amount of solar electricity that can be connected to the grid without causing grid reliability issues or requiring significant grid upgrades. These interconnection limits or circuit-level caps have slowed the pace of our installations in Hawaii and could slow our installations in other markets, harming our growth rate and customer satisfaction scores.

We may be required to make payments or contribute assets to our investors upon the occurrence of certain events, including one-time reset or true-up payments or upon the exercise of a redemption option by one of our investors.

Our fund investors typically advance capital to us based on estimates. The models we use to calculate prepayments in connection with certain of our investment funds will be updated for each investment fund at a fixed date occurring after placement in service of all solar energy systems or an agreed upon date (typically within the first year of the applicable term) to reflect certain specified conditions as they exist at such date, including the ultimate system size of the equipment that was leased, how much it cost, and when it went into service. As a result of this true up, applicable payments are resized, and we may be obligated to refund the investor’s prepayments or to contribute additional assets to the investment fund. Further, our estimated retained value may be reduced. In addition, certain of our fund investors have the right to require us to purchase their interests in the investment funds after a set period of time, generally at a price equal to the greater of a set purchase price or fair market value of the interests at the time of the repurchase. Any significant refunds, capital contributions or purchases that we may be required to make could adversely affect our liquidity or financial condition.

A material drop in the retail price of utility-generated electricity or electricity from other sources would harm our business, financial condition and results of operations.

We believe that a homeowner’s decision to buy solar energy from us is primarily driven by a desire to lower electricity costs. Decreases in the retail prices of electricity from utilities or other energy sources would harm our ability to offer competitive pricing and could harm our business. The price of electricity from utilities could decrease as a result of:

A reduction in utility electricity prices would make the purchase of our solar service offerings less attractive. If the retail price of energy available from utilities were to decrease due to any of these or other reasons, we would be at a competitive disadvantage. As a result, we may be unable to attract new homeowners and our growth would be limited.

It is difficult to evaluate our business and prospects due to our limited operating history.

Until 2014, we focused our efforts primarily on the sales, financing, and monitoring of solar energy systems for residential customers, with installation provided by our solar partners. In February 2014, we purchased the residential sales and installation business of Mainstream Energy Corporation, as well as its fulfillment business, AEE Solar, and its racking business, SnapNrack. We refer to these businesses collectively as “MEC.” We have

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limited experience managing the fulfillment and racking lines of business, and we may not be successful in maintaining or growing the revenue from these businesses. Further, we have limited experience, in comparison to our solar partner model, in our direct-to-consumer business, and as a result, we may fail to grow as quickly or achieve the revenue scale targeted in connection with such model. We may also be unsuccessful in expanding our customer base through installation of our solar service offerings within our current markets or in new markets we may enter. Additionally, we cannot assure you that we will be successful in generating substantial revenue from our current solar service offerings or from any additional solar service offerings we may introduce in the future. Our limited operating history, combined with the rapidly evolving and competitive nature of our industry, may not provide an adequate basis for you to evaluate our results of operations and business prospects. In addition, we only have limited insight into emerging trends, such as alternative energy sources, commodity prices in the overall energy market, and legal and regulatory changes that impact the solar industry, any of which could adversely impact our business, prospects and results of operations.

We have incurred losses and may be unable to achieve or sustain profitability in the future.

We have incurred net losses in the past, and we had an accumulated deficit of $77.0 million as of March 31, 2015. We will continue to incur net losses as we increase our spending to finance the expansion of our operations, expand our installation, engineering, administrative, sales and marketing staffs, increase spending on our brand awareness and other sales and marketing initiatives, and implement internal systems and infrastructure to support our growth. We do not know whether our revenue will grow rapidly enough to absorb these costs and our limited operating history makes it difficult to assess the extent of these expenses or their impact on our results of operations. Our ability to achieve profitability depends on a number of factors, including but not limited to:

Even if we do achieve profitability, we may be unable to sustain or increase our profitability in the future.

Our results of operations may fluctuate from quarter to quarter, which could make our future performance difficult to predict and could cause our results of operations for a particular period to fall below expectations, resulting in a decline in the price of our common stock.

Our quarterly results of operations are difficult to predict and may fluctuate significantly in the future. We have experienced seasonal and quarterly fluctuations in the past and expect these fluctuations to continue. However, given that we are an early-stage company operating in a rapidly changing industry, those fluctuations may be masked by our recent growth rates and thus may not be readily apparent from our historical results of operations. As such, our past quarterly results of operations may not be good indicators of future performance.

In addition to the other risks described in this “Risk Factors” section, as well as the factors discussed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section, the following factors could cause our results of operations and key performance indicators to fluctuate:

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In the past, we have experienced seasonal fluctuations in sales and installations, particularly in the fourth quarter. This has been the result of decreased sales through the holiday season and weather-related installation delays. In addition, energy production is greater in the second and third quarters of the year, causing variability in operating lease revenues throughout the year. Our incentives revenue is also highly variable due to associated revenue recognition rules, as discussed in greater detail in “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” Seasonal and other factors may also contribute to variability in our sales of solar energy systems and product sales. For these or other reasons, the results of any prior quarterly or annual periods should not be relied upon as indications of our future performance. In addition, our actual revenue or key operating metrics in future quarters may fall short of the expectations of investors and financial analysts, which could have a material adverse effect on the trading price of our common stock.

If we fail to manage our recent and future growth effectively, we may be unable to execute our business plan, maintain high levels of customer service or adequately address competitive challenges.

We have experienced significant growth in recent periods, and we intend to continue to expand our business significantly within existing markets and in a number of new locations in the future. This growth has placed, and any future growth may place, a significant strain on our management, operational and financial infrastructure. In particular, we will be required to expand, train and manage our growing employee base and solar partners. Our management will also be required to maintain and expand our relationships with homeowners, suppliers and other third parties and attract new homeowners and suppliers, as well as to manage multiple geographic locations.

In addition, our current and planned operations, personnel, systems and procedures might be inadequate to support our future growth and may require us to make additional unanticipated investment in our infrastructure, including additional costs for the expansion of our employee base and our solar partners as well as marketing and branding costs. Our success and ability to further scale our business will depend, in part, on our ability to manage these changes in a cost-effective and efficient manner. If we cannot manage our growth, we may be unable to take advantage of market opportunities, execute our business strategies or respond to competitive pressures. This could also result in declines in quality or homeowner satisfaction, increased costs, difficulties in introducing new solar service offerings or other operational difficulties. Any failure to effectively manage growth could adversely impact our business and reputation.

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Servicing our debt requires a significant amount of cash to comply with certain covenants and satisfy payment obligations, and we may not have sufficient cash flow from our business to pay our substantial debt and may be forced to take other actions to satisfy our obligations under our indebtedness, which may not be successful.

We have substantial amounts of debt, including the working capital facility and the non-recourse debt facilities entered into by our subsidiaries, as discussed in more detail in the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements. Our ability to make scheduled payments of the principal of, to pay interest on or to refinance our indebtedness depends on our future performance, which is subject to economic, financial, competitive and other factors beyond our control. Our business may not continue to generate cash flow from operations in the future sufficient to service our debt and make necessary capital expenditures to operate our business. If we are unable to generate such cash flow, we may be required to adopt one or more alternatives, such as selling assets, restructuring debt or obtaining additional equity capital on terms that may be onerous or highly dilutive. Our ability to refinance our indebtedness will depend on the capital markets and our financial condition at such time. We may not be able to engage in any of these activities or engage in these activities on desirable terms, which could result in a default on our debt obligations.

We expect to incur substantially more debt in the future, which could intensify the risks to our business.

We and our subsidiaries expect to incur additional debt in the future, subject to the restrictions contained in our debt instruments. Our existing debt arrangements restrict our ability to incur additional indebtedness, including secured indebtedness, and we may be subject to similar restrictions under the terms of future debt arrangements. These restrictions could inhibit our ability to pursue our business strategies. Increases in our existing debt obligations would further heighten the debt related risk discussed above.

Furthermore, there is no assurance that we will be able to enter into new debt instruments on acceptable terms. If we were unable to satisfy financial covenants and other terms under existing or new instruments or obtain waivers or forbearance from our lenders or if we were unable to obtain refinancing or new financings for our working capital, equipment and other needs on acceptable terms if and when needed, our business would be adversely affected.

The production and installation of solar energy systems depends heavily on suitable meteorological conditions. If meteorological conditions are unexpectedly unfavorable, the electricity production from our solar service offerings may be below our expectations, and our ability to timely deploy new systems may be adversely impacted.

The energy produced and revenue and cash flows generated by a solar energy system depend on suitable solar and weather conditions, both of which are beyond our control. Furthermore, components of our systems, such as panels and inverters, could be damaged by severe weather or natural catastrophes, such as hailstorms, tornadoes or earthquakes. In these circumstances, we generally would be obligated to bear the expense of repairing the damaged solar energy systems that we own. Sustained unfavorable weather also could unexpectedly delay the installation of our solar energy systems, leading to increased expenses and decreased revenue and cash flows in the relevant periods. Weather patterns could change, making it harder to predict the average annual amount of sunlight striking each location where our systems are installed. This could make our solar service offerings less economical overall or make individual systems less economical. Any of these events or conditions could harm our business, financial condition and results of operations.

Our business is concentrated in certain markets, putting us at risk of region specific disruptions.

As of March 31, 2015, approximately 58% of our customers were in California and we expect much of our near-term future growth to occur in California, further concentrating our customer base and operational infrastructure. Accordingly, our business and results of operations are particularly susceptible to adverse

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economic, regulatory, political, weather and other conditions in this market and in other markets that may become similarly concentrated. In addition, our corporate and sales headquarters are located in San Francisco, California, an area that is at a heightened risk of earthquakes. We may not have adequate insurance, including business interruption insurance, to compensate us for losses that may occur from any such significant events, including damage to our solar energy systems. A significant natural disaster, such as an earthquake, could have a material adverse impact on our business, results of operations and financial condition. In addition, acts of terrorism or malicious computer viruses could cause disruptions in our or our solar partners’ businesses or the economy as a whole. To the extent that these disruptions result in delays or cancellations of installations or the deployment of our solar service offerings, our business, results of operations and financial condition would be adversely affected.

Loan financing developments could adversely impact our business.

The third-party ownership structure, which we bring to market through our solar service offerings, continues to be the predominant form of system ownership in the residential solar market in many states. However, there is a possibility of a shift from this trend to an outright purchase of the system by the homeowner (i.e., a homeowner purchases the solar energy system outright instead of leasing the system from us and paying us for the solar power produced by those systems for a 20-year initial term) with the development of loan financing products. Increases in third-party loan financing products or outright purchases could result in the demand for long-term customer agreements to decline, which would require us to shift our product focus to respond to the market trend and could have an adverse effect on our business. In 2014, the majority of our customers chose our solar service offerings as opposed to buying a solar energy system outright. Our financial model is impacted by the volume of homeowners who choose our solar service offerings, and an increase in the number of customers who choose to purchase solar energy systems (whether for cash or through third-party financing) may harm our business and financial results.

In addition to the Commercial ITC, the federal government currently offers a 30% ITC under Section 25D of the Code (“Individual ITC”). The Individual ITC is available only to individual taxpayers who purchase a solar energy system outright (for cash or through a loan) and is scheduled to expire at the end of 2016. Additionally, we sell solar panels and equipment to resellers and installers who sell solar energy systems to individual homeowners for cash. As such, we expect the demand for that portion of our direct-to-consumer products and sales in our distribution channel to be adversely affected to the extent such Individual ITC is not extended (with or without some level of reduction).

Our growth depends in part on the success of our relationships with third parties, including our solar partners.

A key component of our growth strategy is to develop or expand our relationships with third parties. For example, we are investing resources in establishing strategic relationships with market players across a variety of industries, including large retailers, to generate new customers. These programs may not roll out as quickly as planned or produce the results we anticipated. A significant portion of our business depends on attracting and retaining new and existing solar partners. Negotiating relationships with our solar partners, investing in due diligence efforts with potential solar partners, training such third parties and contractors, and monitoring them for compliance with our standards require significant time and resources and may present greater risks and challenges than expanding a direct sales or installation team. If we are unsuccessful in establishing or maintaining our relationships with these third parties, our ability to grow our business and address our market opportunity could be impaired. Even if we are able to establish and maintain these relationships, we may not be able to execute on our goal of leveraging these relationships to meaningfully expand our business, brand recognition and customer base. This would limit our growth potential and our opportunities to generate significant additional revenue or cash flows.

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We and our solar partners depend on a limited number of suppliers of solar panels and other system components to adequately meet anticipated demand for our solar service offerings. Any shortage, delay or component price change from these suppliers, or the acquisition of any of these suppliers by a competitor, could result in sales and installation delays, cancellations and loss of market share.

We and our solar partners purchase solar panels, inverters and other system components from a limited number of suppliers, making us susceptible to quality issues, shortages and price changes. If we or our solar partners fail to develop, maintain and expand our relationships with these or other suppliers, we may be unable to adequately meet anticipated demand for our solar service offerings, or we may only be able to offer our systems at higher costs or after delays. If one or more of the suppliers that we or our solar partners rely upon to meet anticipated demand ceases or reduces production, we may be unable to quickly identify alternate suppliers or to qualify alternative products on commercially reasonable terms, and we may be unable to satisfy this demand. The acquisition of a supplier by one of our competitors could limit our access to such components and require significant redesigns of our solar energy systems or installation procedures and have a material adverse effect on our business.

In particular, there are a limited number of suppliers of inverters, which are components that convert electricity generated by solar panels into electricity that can be used to power the home. For example, once we design a system for use with a particular inverter, if that type of inverter is not readily available at an anticipated price, we may incur additional delay and expense to redesign the system. Further, the inverters on our solar energy systems generally carry only 10-year warranties. If there is an inverter equipment shortage in a year when a substantial number of inverters on our systems need to be replaced, we may not be able to replace the inverters to maintain proper system functioning or may be forced to do so at higher than anticipated prices, either of which would adversely impact our business.

There have also been periods of industry-wide shortage of key components, including solar panels, in times of rapid industry growth. For example, new or unexpected changes in rooftop fire codes or building codes may require new or different system components to satisfy compliance with such newly effective codes or regulations, which may not be readily available for distribution to us or our suppliers. The manufacturing infrastructure for some of these components has a long lead time, requires significant capital investment and relies on the continued availability of key commodity materials, potentially resulting in an inability to meet demand for these components and, as a result, could negatively impact our ability to install systems in a timely manner. Further, any decline in the exchange rate of the U.S. dollar compared to the functional currency of our component suppliers could increase our component prices. Any of these shortages, delays or price changes could limit our growth, cause cancellations or adversely affect our operating margins, and result in loss of market share and damage to our brand.

As the primary entity that contracts with homeowners, we are subject to risks associated with construction, cost overruns, delays, regulatory compliance and other contingencies, any of which could have a material adverse effect on our business and results of operations.

We are a licensed contractor in certain communities that we service, and we are ultimately responsible as the contracting party for every solar energy system installation. We may be liable, either directly or through our solar partners, to homeowners for any damage we cause to them, their home, belongings or property during the installation of our systems. For example, we, either directly or through our solar partners, frequently penetrate homeowners’ roofs during the installation process and may incur liability for the failure to adequately weatherproof such penetrations following the completion of construction. In addition, because the solar energy systems we or our solar partners deploy are high voltage energy systems, we may incur liability for any failure to comply with electrical standards and manufacturer recommendations.

Further, we or our solar partners may face construction delays or cost overruns, which may adversely affect our or our solar partners’ ability to ramp up the volume of installation in accordance with our plans. Such delays or overruns may occur as a result of a variety of factors, such as labor shortages, defects in materials and

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workmanship, adverse weather conditions, transportation constraints, construction change orders, site changes, labor issues and other unforeseen difficulties, any of which could lead to increased cancellation rates, reputational harm and other adverse effects.

In addition, the installation of solar energy systems, energy-storage systems and other energy-related products requiring building modifications are subject to oversight and regulation in accordance with national, state and local laws and ordinances relating to building, fire and electrical codes, safety, environmental protection, utility interconnection and metering, and related matters. We also rely on certain of our employees to maintain professional licenses in many of the jurisdictions in which we operate, and our failure to employ properly licensed personnel could adversely affect our licensing status in those jurisdictions. It is difficult and costly to track the requirements of every individual authority having jurisdiction over our installations and to design solar energy systems to comply with these varying standards. Any new government regulations or utility policies pertaining to our systems may result in significant additional expenses to us and our homeowners and, as a result, could cause a significant reduction in demand for our solar service offerings.

While we have a variety of stringent quality standards that we apply in the selection of our solar partners, we do not control our suppliers and solar partners or their business practices. Accordingly, we cannot guarantee that they follow our standards or ethical business practices, such as fair wage practices and compliance with environmental, safety and other local laws. A lack of demonstrated compliance could lead us to seek alternative suppliers or contractors, which could increase our costs and result in delayed delivery or installation of our products, product shortages or other disruptions of our operations. Violation of labor or other laws by our suppliers and solar partners or the divergence of a supplier’s or solar partners’ labor or other practices from those generally accepted as ethical in the United States or other markets in which we do business could also attract negative publicity for us and harm our business, brand and reputation in the market.

We typically bear the risk of loss and the cost of maintenance, repair and removal on solar energy systems that are owned or leased by our investment funds.

We typically bear the risk of loss and are generally obligated to cover the cost of maintenance, repair and removal for any solar energy system that we sell or lease to our investment funds. At the time we sell or lease a solar energy system to an investment fund, we enter into a maintenance services agreement where we agree to operate and maintain the system for a fixed fee that is calculated to cover our future expected maintenance costs. If our solar energy systems require an above-average amount of repairs or if the cost of repairing systems were higher than our estimate, we would need to perform such repairs without additional compensation. If our solar energy systems, a majority of which are located in California and Hawaii, are damaged as the result of a natural disaster beyond our control, losses could exceed or be excluded from, our insurance policy limits, and we could incur unforeseen costs that could harm our business and financial condition. We may also incur significant costs for taking other actions in preparation for, or in reaction to, such events. We purchase property insurance with industry standard coverage and limits approved by an investor’s third-party insurance advisors to hedge against such risk, but such coverage may not cover our losses.

Disruptions to our solar production metering solution could negatively impact our revenues and increase our expenses.

Our ability to invoice homeowners for the energy produced by our solar energy systems and monitor solar energy production for various purposes depends on the operation of our metering solution. We could incur significant expense and disruption to our operations in connection with failures of our metering solution, including meter hardware failures and failure of the cellular technology that we use to communicate with those meters. Many of our meters operate on either the 2G or 3G cellular data networks, which are expected to sunset before the term of our contract with homeowners. Upgrading our metering solution may cause us to incur a significant expense. Additionally, our meters communicate data through proprietary software, which we license from our metering partners. Should we be unable to continue to license, on agreeable terms, the software necessary to communicate with our meters, it could cause a significant disruption in our business and operations.

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Problems with product quality or performance may cause us to incur warranty expenses and performance guarantee expenses, may lower the residual value of our solar energy systems and may damage our market reputation and cause our financial results to decline.

Homeowners who buy energy from us under leases or power purchase agreements are covered by production guaranties and roof penetration warranties. As the owners of the solar energy systems, we or our investment funds receive a warranty from the inverter and solar panel manufacturers, and, for those solar energy systems that we do not install directly, we receive workmanship and material warranties as well as roof penetration warranties from our solar partners. For example, we recently had to replace a significant number of defective inverters, the cost of which was borne by the manufacturer. However, our customers were without solar service for a period of time while the work was done, which impacted customer satisfaction. Furthermore, one or more of our third-party manufacturers or solar partners could cease operations and no longer honor these warranties, leaving us to fulfill these potential obligations to homeowners. Further, we provide a performance guarantee with certain solar service offerings pursuant to which we compensate homeowners on an annual basis if their system does not meet the electricity production guarantees set forth in their agreement with us. Homeowners who buy energy from us under leases or power purchase agreements are covered by production guarantees equal to the length of the term of these agreements, typically 20 years.

Because of our limited operating history, we have been required to make assumptions and apply judgments regarding a number of factors, including our anticipated rate of warranty claims and the durability, performance and reliability of our solar energy systems. Our assumptions could prove to be materially different from the actual performance of our systems, causing us to incur substantial expense to repair or replace defective solar energy systems in the future or to compensate homeowners for systems that do not meet their production guarantees. Product failures or operational deficiencies also would reduce our revenue from power purchase or lease agreements because they are dependent on system production. Any widespread product failures or operating deficiencies may damage our market reputation and adversely impact our financial results.

Product liability claims against us could result in adverse publicity and potentially significant monetary damages.

If our solar service offerings, including our racking systems or other products, injured someone, we would be exposed to product liability claims. Because solar energy systems and many of our other current and anticipated products are electricity-producing devices, it is possible that consumers or their property could be injured or damaged by our products, whether by product malfunctions, defects, improper installation or other causes. We rely on third-party manufacturing warranties, warranties provided by our solar partners and our general liability insurance to cover product liability claims and have not obtained separate product liability insurance. Any product liability claim we face could be expensive to defend and divert management’s attention. The successful assertion of product liability claims against us could result in potentially significant monetary damages that could require us to make significant payments, as well as subject us to adverse publicity, damage our reputation and competitive position and adversely affect sales of our systems and other products. In addition, product liability claims, injuries, defects or other problems experienced by other companies in the residential solar industry could lead to unfavorable market conditions to the industry as a whole, and may have an adverse effect on our ability to attract homeowners, thus affecting our growth and financial performance.

The residual value of our solar energy systems at the end of the associated term of the lease or power purchase agreement may be lower than projected, which may adversely affect our financial performance and valuation.

We depreciate the costs of our solar energy systems over 20 years to a residual value. At the end of the initial 20-year term, customers may choose to purchase their solar energy systems, ask to remove the system at our cost or renew their customer agreements. Homeowners may choose to not renew or purchase for any reason, such as pricing, decreased energy consumption, relocation of residence or switching to a competitor product.

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Furthermore, it is difficult to predict how future environmental regulations may affect the costs associated with the removal, disposal or recycling of our solar energy systems. If the value in trade or renewal revenue at the end of the contract is less than we expect, after giving effect to any associated removal and redeployment costs, we may be required to recognize all or some of the remaining unamortized costs. This could materially impair our future results of operations.

We have guaranteed a minimum return to be received by an investor in one of our investment funds, which could adversely affect our business and financial condition if we were required to make any payments as a result of this guarantee.

We have guaranteed payments to the investor in one of our investment funds in the case that the investor does not achieve a specified minimum internal rate of return in this fund, which rate is assessed annually. The amounts of potential future payments under this guarantee depend on the amounts and timing of future distributions to the investor from funds and the tax benefits that accrue to the investor from the fund’s activities. Because of uncertainties associated with estimating the timing and amounts of distributions to the investor, we cannot determine the potential maximum future payments that we could have to make under this guarantee. To date, we have not been required to make any payments under this guarantee. We may agree to similar terms with other third-party fund investors in the future. Any significant payments that we may be required to make under such guarantees, now or in the future, could adversely affect our financial condition.

Federal tax law is not clear regarding when our projects can be considered to have been “placed in service,” and we have obligations to indemnify some of our fund investors if the IRS is successful in asserting that the relevant fund did not place in service the system it owns. Our business and financial condition could be adversely affected if we were required to make any payments as a result of this indemnity.

Generally, only the entity that originally places a solar system in service may claim a Commercial ITC. The term “placed in service” for federal tax purposes is not statutorily defined, and while the IRS and tax court decisions have provided general guidance related to the factors that should determine when property is placed in service for federal tax purposes, it has not provided any guidance specifically related to this issue for residential solar systems. We have indemnification obligations in place with some of our fund investors for ITC losses resulting from systems being transferred to their funds after having been placed in service for federal tax purposes. If the IRS were to assert that these residential solar energy systems were placed in service for federal tax purposes, before being transferred to the relevant fund, it could lead to the loss of the ITCs claimed on these systems, and any resulting indemnification payments that we may be required to make to our fund investors, now or in the future, could adversely affect our financial condition. Furthermore, if the Commercial ITC steps down as is contemplated under current law from 30% to 10% in 2017, there may be confusion as to which year some of our systems are placed in service for federal tax purposes and which of the 30% and 10% tax credit can be claimed on such systems.

Damage to our brand and reputation or failure to expand our brand would harm our business and results of operations.

We depend significantly on our brand and reputation for high-quality solar service offerings, engineering and customer service to attract homeowners and grow our business. If we fail to continue to deliver our solar service offerings within the planned timelines, if our solar service offerings do not perform as anticipated or if we damage any homeowners’ properties or cancel projects, our brand and reputation could be significantly impaired. We also depend greatly on referrals from homeowners for our growth. Therefore, our inability to meet or exceed homeowners’ expectations would harm our reputation and growth through referrals. Further, we have focused particular attention on expeditiously growing our direct sales force and our solar partners, leading us in some instances to hire personnel or partner with third parties who we may later determine do not fit our company culture. If we cannot manage our hiring and training processes to avoid potential issues related to expanding our

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sales team or solar partners and maintain appropriate customer service levels, our business and reputation may be harmed and our ability to attract homeowners would suffer. In addition, if we were unable to achieve a similar level of brand recognition as our competitors, some of which currently have a broader brand footprint as a result of a larger direct sales force, more resources and longer operational history, we could lose recognition in the marketplace among prospective customers, suppliers and partners, which could affect our growth and financial performance. Our growth strategy involves marketing and branding initiatives that will involve incurring significant expenses in advance of corresponding revenues. We cannot assure you that such marketing and branding expenses will result in the successful expansion of our brand recognition or increase our revenues.

A failure to hire and retain a sufficient number of employees and service providers in key functions would constrain our growth and our ability to timely complete homeowners’ projects and successfully manage homeowner accounts.

To support our growth, we need to hire, train, deploy, manage and retain a substantial number of skilled employees, engineers, installers, electricians, sales and project finance specialists. Competition for qualified personnel in our industry is increasing, particularly for skilled personnel involved in the installation of solar energy systems. We may be unable to attract or retain qualified and skilled installation personnel or installation companies to be our solar partners, which would have an adverse effect on our business. We and our solar partners also compete with the homebuilding and construction industries for skilled labor. As these industries grow and seek to hire additional workers, our cost of labor may increase. The unionization of the industry’s labor force could also increase our labor costs. Shortages of skilled labor could significantly delay a project or otherwise increase our costs. Because our profit on a particular installation is based in part on assumptions as to the cost of such project, cost overruns, delays or other execution issues may cause us to not achieve our expected margins or cover our costs for that project. In addition, because we are headquartered in the San Francisco Bay Area, we compete for a limited pool of technical and engineering resources that requires us to pay wages that are competitive with relatively high regional standards for employees in these fields. Further, we need to continue to expand upon the training of our customer service team to provide high-end account management and service to homeowners before, during and following the point of installation of our solar energy systems. Identifying and recruiting qualified personnel and training them requires significant time, expense and attention. It can take several months before a new customer service person is fully trained and productive at the standards that we have established. If we are unable to hire, develop and retain talented customer service personnel, we may not be able to realize the expected benefits of this investment or grow our business.

In addition, to support the growth and success of our direct-to-consumer channel, we need to recruit, retain and motivate a large number of sales personnel on a continuing basis. We compete with many other companies for qualified sales personnel, and it could take many months before a new salesperson is fully trained on our solar service offerings. If we are unable to hire, develop and retain qualified sales personnel or if they are unable to achieve desired productivity levels, we may not be able to compete effectively.

If we or our solar partners cannot meet our hiring, retention and efficiency goals, we may be unable to complete homeowners’ projects on time or manage homeowner accounts in an acceptable manner or at all. Any significant failures in this regard would materially impair our growth, reputation, business and financial results. If we are required to pay higher compensation than we anticipate, these greater expenses may also adversely impact our financial results and the growth of our business.

The loss of one or more members of our senior management or key employees may adversely affect our ability to implement our strategy.

We depend on our experienced management team, and the loss of one or more key executives could have a negative impact on our business. In particular, we are dependent on the services of our chief executive officer and co-founder, Lynn Jurich, and our Chairman and co-founder, Edward Fenster. We also depend on our ability to retain and motivate key employees and attract qualified new employees. Neither our founders nor our key

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employees are bound by employment agreements for any specific term, and we may be unable to replace key members of our management team and key employees in the event we lose their services. Integrating new employees into our management team could prove disruptive to our operations, require substantial resources and management attention and ultimately prove unsuccessful. We recently hired our Chief Financial Officer in March 2015, and it will take time for this executive officer to become fully integrated into his new role. An inability to attract and retain sufficient managerial personnel who have critical industry experience and relationships could limit or delay our strategic efforts, which could have a material adverse effect on our business, financial condition and results of operations.

We may not realize the anticipated benefits of past or future acquisitions, and integration of these acquisitions may disrupt our business and management.

We acquired MEC in February 2014 and Clean Energy Experts in April 2015. We may in the future acquire additional companies, project pipelines, products, or technologies or enter into joint ventures or other strategic initiatives. We may not realize the anticipated benefits of past or future acquisitions, and any acquisition has numerous risks that are not within our control. These risks include the following, among others:

Our failure to address these risks, or other problems encountered in connection with our past or future acquisitions, could cause us to fail to realize the anticipated benefits of these acquisitions or investments, cause us to incur unanticipated liabilities, and harm our business generally. Future acquisitions could also result in dilutive issuances of our equity securities, the incurrence of debt, contingent liabilities, amortization expenses, incremental expenses or the write-off of goodwill, any of which could harm our financial condition or results of operations.

Mergers and acquisitions of companies are inherently risky, may not produce the anticipated benefits and could adversely affect our business, financial condition, or results of operations.

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If we are unsuccessful in developing and maintaining our proprietary technology, including our BrightPath software, our ability to attract and retain solar partners could be impaired, our competitive position could be harmed and our revenue could be reduced.

Our future growth depends on our ability to continue to develop and maintain our proprietary technology that supports our solar service offerings, including our BrightPath software. In addition, we rely, and expect to continue to rely, on licensing agreements with certain third parties for aerial images that allow us to efficiently and effectively analyze a homeowner’s rooftop for solar energy system specifications. In the event that our current or future products require features that we have not developed or licensed, or we lose the benefit of an existing license, we will be required to develop or obtain such technology through purchase, license or other arrangements. If the required technology is not available on commercially reasonable terms, or at all, we may incur additional expenses in an effort to internally develop the required technology. In addition, our BrightPath software was developed, in part, with U.S. federal government funding. When new technologies are developed with U.S. government funding, the government obtains certain rights in any resulting patents, including a nonexclusive license authorizing the government to use the invention for non-commercial purposes. These rights may permit the government to disclose our confidential information to third parties and to exercise “march-in” rights to use or allow third parties to use our patented technology. We are also subject to certain reporting and other obligations to the U.S. government in connection with funding for BrightPath. If we were unable to maintain our existing proprietary technology, our ability to attract and retain solar partners could be impaired, our competitive position could be harmed and our revenue could be reduced.

Our business may be harmed if we fail to properly protect our intellectual property, and we may also be required to defend against claims or indemnify others against claims that our intellectual property infringes on the intellectual property rights of third parties.

We believe that the success of our business depends in part on our proprietary technology, including our software, information, processes and know-how. We rely on copyright, trade secret and patent protections to secure our intellectual property rights. Although we may incur substantial costs in protecting our technology, we cannot be certain that we have adequately protected or will be able to adequately protect it, that our competitors will not be able to utilize our existing technology or develop similar technology independently, that the claims allowed with respect to any patents held by us will be broad enough to protect our technology or that foreign intellectual property laws will adequately protect our intellectual property rights. Moreover, we cannot be certain that our patents provide us with a competitive advantage. Despite our precautions, it may be possible for third parties to obtain and use our intellectual property without our consent. Unauthorized use of our intellectual property by third parties, and the expenses incurred in protecting our intellectual property rights, may adversely affect our business. In the future, some of our products could be alleged to infringe existing patents or other intellectual property of third parties, and we cannot be certain that we will prevail in any intellectual property dispute. In addition, any future litigation required to enforce our patents, to protect our trade secrets or know-how or to defend us or indemnify others against claimed infringement of the rights of third parties could harm our business, financial condition and results of operations.

The Office of the Inspector General of the U.S. Department of Treasury has issued subpoenas to a number of significant participants in the rooftop solar energy installation industry, including us. The subpoena we received requires us to deliver certain documents in our possession relating to our participation in the U.S. Treasury grant program. These documents are being delivered to the Office of the Inspector General of the U.S. Department of Treasury, which is investigating the administration and implementation of the U.S. Treasury grant program.

In July 2012, we and other companies that are significant participants in both the solar industry and the cash grant program under Section 1603 of the American Recovery and Reinvestment Act of 2009 received subpoenas from the U.S. Department of Treasury’s Office of the Inspector General. Our subpoena requested, among other things, documents that relate to our applications for U.S. Treasury grants and communications with certain other solar service companies or certain firms that appraise solar energy property for U.S. Treasury grant application

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purposes. The Inspector General is working with the Civil Division of the U.S. Department of Justice to investigate the administration and implementation of the U.S. Treasury grant program, including possible misrepresentations concerning the fair market value of the solar power systems submitted for grant under that program made in grant applications by companies in the solar industry, including us. We are continuing to produce documents and testimony as requested by the Inspector General, and we intend to continue to cooperate fully with the Inspector General and the Department of Justice. We are not able to predict how long this review will be on-going. If, at the conclusion of the investigation, the Inspector General concludes that misrepresentations were made, the Department of Justice could decide to bring a civil action to recover amounts it believes were improperly paid to us. If it were successful in asserting this action, we could be required to pay damages and penalties for any funds received based on such misrepresentations (which, in turn, could require us to make indemnity payments to certain of our fund investors). Such consequences could have a material adverse effect on our business, liquidity, financial condition and prospects. Additionally, the period of time necessary to resolve the investigation is uncertain, and this matter could require significant management and financial resources that could otherwise be devoted to the operation of our business.

If the Internal Revenue Service or the U.S. Treasury Department makes determinations that the fair market value of our solar energy systems is materially lower than what we have claimed, we may have to pay significant amounts to our fund investors and our business, financial condition and prospects may be materially and adversely affected.

We and our fund investors claim the Commercial ITC or the U.S. Treasury grant in amounts based on the fair market value of our solar energy systems. We have obtained independent appraisals to determine the fair market values we report for claiming Commercial ITCs and U.S. Treasury grants. The IRS and the U.S. Treasury Department review these fair market values. With respect to U.S. Treasury grants, the U.S. Treasury Department reviews the reported fair market value in determining the amount initially awarded, and the IRS and the U.S. Treasury Department may also subsequently audit the fair market value and determine that amounts previously awarded must be repaid to the U.S. Treasury Department or that excess awards constitute taxable income for U.S. federal income tax purposes. With respect to Commercial ITCs, the IRS may review the fair market value on audit and determine that the tax credits previously claimed must be reduced. If the fair market value is determined in these circumstances to be less than we reported, we may owe our fund investors an amount equal to this difference, plus any costs and expenses associated with a challenge to that valuation. We could also be subject to tax liabilities, including interest and penalties. If the IRS or the U.S. Treasury Department further disagrees now or in the future with the amounts we reported regarding the fair market value of our solar energy systems, or if we receive an adverse outcome with respect to the Department of Treasury Inspector General investigation, it could have a material adverse effect on our business, financial condition and prospects. For example, a hypothetical five percent downward adjustment in the fair market value of the solar energy systems for which we have been awarded approximately $269.0 million in U.S. Department of Treasury grants since the beginning of the U.S. Treasury grant program through December 31, 2014, would obligate us to repay approximately $14 million to our fund investors. Two of our investment funds have been subject to audit by the IRS related to this issue. One of these audits has been closed with no adjustment. The other audit is still ongoing.

We are subject to legal proceedings, regulatory inquiries and litigation, and we may be named in additional legal proceedings, become involved in regulatory inquiries or be subject to litigation in the future, all of which are costly, distracting to our core business and could result in an unfavorable outcome, or a material adverse effect on our business, financial condition, results of operations, or the trading price for our securities.

We are involved in legal proceedings and receive inquiries from government and regulatory agencies, including the pending Treasury investigation discussed above and under “Business—Legal Proceedings.” In the event that we are involved in significant disputes or are the subject of a formal action by a regulatory agency, we could be exposed to costly and time consuming legal proceedings that could result in any number of outcomes. Although outcomes of such actions vary, any current or future claims or regulatory actions initiated by or against

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us, whether successful or not, could result in expensive costs, costly damage awards or settlement amounts, injunctive relief, increased costs of business, fines or orders to change certain business practices, significant dedication of management time, diversion of significant operational resources, or otherwise harm our business.

Further, we are currently involved in an ongoing consumer rights class action lawsuit, as well as a wage and hour class action. If we are not successful in these cases, we may be required to pay significant monetary damages, which could hurt our results of operations. Lawsuits are time-consuming and expensive to resolve and divert management’s time and attention. Although we carry general liability insurance, our insurance may not cover potential claims or may not be adequate to indemnify us for all liability that may be imposed. We cannot predict how the courts will rule in the class action lawsuits or any other potential lawsuit against us. Decisions in favor of parties that bring lawsuits against us could subject us to significant liability for damages, adversely affect our results of operations and harm our reputation.

A failure to comply with laws and regulations relating to our interactions with current or prospective residential customers could result in negative publicity, claims, investigations, and litigation, and adversely affect our financial performance.

Our business involves transactions with homeowners. We must comply with numerous federal, state and local laws and regulations that govern matters relating to our interactions with homeowners, including those pertaining to privacy and data security, consumer financial and credit transactions, home improvement contracts, warranties and direct-to-home solicitation. These laws and regulations are dynamic and subject to potentially differing interpretations, and various federal, state and local legislative and regulatory bodies may expand current laws or regulations, or enact new laws and regulations, regarding these matters. Changes in these laws or regulations or their interpretation could dramatically affect how we do business, acquire customers, and manage and use information we collect from and about current and prospective customers and the costs associated therewith. We strive to comply with all applicable laws and regulations relating to our interactions with residential customers. It is possible, however, that these requirements may be interpreted and applied in a manner that is inconsistent from one jurisdiction to another and may conflict with other rules or our practices. Our non-compliance with any such law or regulations could also expose us to claims, proceedings, litigation and investigations by private parties and regulatory authorities, as well as substantial fines and negative publicity, each of which may materially and adversely affect our business. We have incurred, and will continue to incur, significant expenses to comply with such laws and regulations, and increased regulation of matters relating to our interactions with residential customers could require us to modify our operations and incur significant additional expenses, which could have an adverse effect on our business, financial condition and results of operations.

Compliance with occupational safety and health requirements and best practices can be costly, and noncompliance with such requirements may result in potentially significant penalties, operational delays and adverse publicity.

The installation of solar energy systems requires our employees and employees of our solar partners to work with complicated and potentially dangerous electrical systems. The evaluation and installation of our energy-related products require these employees to work in locations that may contain potentially dangerous levels of asbestos, lead or mold or other substances. We also maintain large fleets of vehicles that these employees use in the course of their work. There is substantial risk of serious injury or death if proper safety procedures are not followed. Our operations are subject to regulation under the U.S. Occupational Safety and Health Act (“OSHA”) and equivalent state laws. Changes to OSHA requirements, or stricter interpretation or enforcement of existing laws or regulations, could result in increased costs. If we fail to comply with applicable OSHA regulations, even if no work-related serious injury or death occurs, we may be subject to civil or criminal enforcement and be required to pay substantial penalties, incur significant capital expenditures, or suspend or limit operations. Any accidents, citations, violations, injuries or failure to comply with industry best practices may subject us to adverse publicity, damage our reputation and competitive position and adversely affect our business.

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Rising interest rates will adversely impact our business.

Rising interest rates will increase our cost of capital. Our future success depends on our ability to raise capital from fund investors and obtain secured lending to help finance the deployment of our solar service offerings. Part of our business strategy is to seek to reduce our cost of capital through these arrangements to improve our margins, offset future reductions in government incentives and maintain the price competitiveness of our solar service offerings. Rising interest rates may have an adverse impact on our ability to offer attractive pricing on our solar service offerings to homeowners.

The majority of our cash flows to date have been from solar service offerings under customer agreements that have been monetized under various investment fund structures. One of the components of this monetization is the present value of the payment streams from homeowners who enter into these customer agreements. If the rate of return required by capital providers, including debt providers, rises as a result of a rise in interest rates, it will reduce the present value of the homeowner payment stream and consequently reduce the total value derived from this monetization. Any measures that we could take to mitigate the impact of rising interest rates on our ability to secure third-party financing could ultimately have an adverse impact on the value proposition that we offer homeowners.

We are exposed to the credit risk of homeowners and payment delinquencies on our accounts receivables.

Our customer agreements are typically for 20 years and require the homeowner to make monthly payments to us. Accordingly, we are subject to the credit risk of homeowners. As of March 31, 2015, the average FICO score of our customers under a lease or power purchase agreement was approximately 760, but this may decline to the extent FICO score requirements under future investment funds are relaxed. While to date homeowner defaults have been immaterial, we expect that the risk of homeowner defaults may increase as we grow our business. Due to the immaterial amount of homeowner defaults to date, our reserve for this exposure is minimal, and our future exposure may exceed the amount of such reserves. If we experience increased homeowner credit defaults, our revenues and our ability to raise new investment funds could be adversely affected. If economic conditions worsen, certain of our homeowners may face liquidity concerns and may be unable to satisfy their payment obligations to us on a timely basis or at all, which could have a material adverse effect on our financial condition and results of operations.

The requirements of being a public company may strain our resources, divert management’s attention and affect our ability to attract and retain qualified board members and officers.

As a public company, we are subject to the reporting requirements of the Exchange Act, the listing requirements of the NASDAQ Stock Market and other applicable securities rules and regulations. Compliance with these rules and regulations will increase our legal and financial compliance costs, make some activities more difficult, time-consuming or costly and increase demand on our systems and resources. The Exchange Act requires, among other things, that we file annual, quarterly and current reports with respect to our business and results of operations and maintain effective disclosure controls and procedures and internal control over financial reporting. To maintain and improve our disclosure controls and procedures and internal control over financial reporting to meet this standard, significant resources and management oversight may be required. As a result, management’s attention may be diverted from other business concerns, which could harm our business and results of operations. Although we have already hired additional employees to comply with these requirements, we may need to hire more employees in the future, which will increase our costs and expenses.

We use “open source” software in our solutions, which may require that we release the source code of certain software subject to open source licenses or subject us to possible litigation or other actions that could adversely affect our business.

We utilize software that is licensed under so-called “open source,” “free” or other similar licenses. Open source software is made available to the general public on an “as-is” basis under the terms of a non-negotiable

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license. We currently combine our proprietary software with open source software but not in a manner that we believe requires the release of the source code of our proprietary software to the public. However, our use of open source software may entail greater risks than use of third-party commercial software. Open source licensors generally do not provide warranties or other contractual protections regarding infringement claims or the quality of the code. In addition, if we combine our proprietary software with open source software in a certain manner, we could, under certain open source licenses, be required to release the source code of our proprietary software to the public. This would allow our competitors to create similar offerings with lower development effort and time. We may also face claims alleging noncompliance with open source license terms or infringement or misappropriation of proprietary software. These claims could result in litigation, require us to purchase a costly license or require us to devote additional research and development resources to change our software, any of which would have a negative effect on our business and results of operations. In addition, if the license terms for open source software that we use change, we may be forced to re-engineer our solutions, incur additional costs or discontinue the use of these solutions if re-engineering cannot be accomplished on a timely basis. Although we monitor our use of open source software to avoid subjecting our offerings to unintended conditions, few courts have interpreted open source licenses, and there is a risk that these licenses could be construed in a way that could impose unanticipated conditions or restrictions on our ability to use our proprietary software. We cannot guarantee that we have incorporated or will incorporate open source software in our software in a manner that will not subject us to liability or in a manner that is consistent with our current policies and procedures.

Any unauthorized disclosure or theft of personal information we gather, store and use could harm our reputation and subject us to claims or litigation.

We receive, store and use personal information of homeowners, including names, addresses, e-mail addresses, credit information and other housing and energy use information. Unauthorized disclosure of such personal information, whether through breach of our systems by an unauthorized party, employee theft or misuse, or otherwise, could harm our business. If we were subject to an inadvertent disclosure of such personal information, or if a third party were to gain unauthorized access to homeowners’ personal information we possess, we could be subject to claims or litigation arising from damages suffered by homeowners. In addition, we could incur significant costs in complying with the multitude of federal, state and local laws regarding the unauthorized disclosure of personal information. Finally, any perceived or actual unauthorized disclosure of such information could harm our reputation, substantially impair our ability to attract and retain homeowners and have an adverse impact on our business.

Our management will not be required to evaluate the effectiveness of our internal control over financial reporting until the end of the fiscal year for which our second annual report is due. If we are unable to establish and maintain effective internal control over financial reporting, investors may lose confidence in the accuracy of our financial reports.

In connection with the audits of our consolidated financial statements for the years ended December 31, 2013 and 2012, we identified material weaknesses in our internal control over financial reporting relating to certain aspects of our financial statement close process and our accounting for income taxes. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of a company’s annual or interim financial statements will not be prevented or detected on a timely basis. These material weaknesses resulted from an aggregation of deficiencies.

We incorrectly accounted for our deferred tax liabilities, prepaid tax asset and the related amortization as it related to income taxes incurred on intercompany transactions. The foregoing resulted in the restatement of our 2012 consolidated financial statements. Subsequent to the quarter ended March 31, 2015, we also identified and corrected an immaterial error related to the accounting for taxes on intercompany transactions. We continue to remediate our internal controls related to the accounting for income taxes.

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The accounting policies associated with our investment funds are complex, which contributed to the material weaknesses in our internal control over financial reporting. For a certain fund arrangement, we initially characterized the transfer of legal title to certain solar energy systems and the associated prepaid cash flows as a sale as opposed to a lease pass-through arrangement. Additionally, our accrual for certain milestone payments was incomplete.

Finally, deficiencies in the design and operation of our internal controls resulted in audit adjustments and delayed our financial statement close process for the years ended December 31, 2013 and 2012.

As a public company, we will be required to establish and maintain internal control over financial reporting and to report any material weaknesses in such internal controls. Section 404 of the Sarbanes-Oxley Act requires that we evaluate and determine the effectiveness of our internal control over financial reporting. Beginning with our second annual report following this offering, we will be required to provide a management report on internal control over financial reporting. When we are no longer an emerging growth company, our management report on internal control over financial reporting will need to be attested to by our independent registered public accounting firm. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud will be detected.

We may fail to establish and maintain effective internal control over financial reporting, in which case we may not detect errors on a timely basis and our financial statements may be materially misstated. In addition, we cannot guarantee that our internal control over financial reporting will prevent or detect all errors and fraud. The risk of errors is increased in light of the complexity of our business and investment funds. For example, we must deal with significant complexity in accounting for our fund structures and the resulting allocation of net income (loss) between our stockholders and noncontrolling interests under the hypothetical liquidation book value (“HLBV”) method as well as the income tax consequences of these fund structures. As we enter into additional investment funds, which may have contractual provisions different from those of our existing funds, the analysis as to whether we consolidate these funds, the calculation under the HLBV method, and the analysis of the tax impact could become increasingly complicated. This additional complexity could require us to hire additional resources and increase the chance that we experience errors in the future.

If we fail to establish and maintain effective internal control over financial reporting, investors may lose confidence in the accuracy and completeness of our financial reports, which could cause the price of our common stock to decline. In addition, we could become subject to investigations by the NASDAQ Stock Market, the SEC or other regulatory authorities, which could require additional management attention and which could adversely affect our business.

Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

As of December 31, 2014, we had U.S. federal net operating loss carryforwards of approximately $454.5 million and state net operating loss carryforwards of approximately $409.6 million, which begin expiring in varying amounts from 2028 through 2034 if unused. Under Sections 382 and 383 of the Code if a corporation undergoes an “ownership change,” the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes, such as research tax credits, to offset its post-change income and taxes may be limited. In general, an “ownership change” occurs if there is a cumulative change in our ownership by “5% shareholders” that exceeds 50 percentage points over a rolling three-year period. Similar rules may apply under state tax laws. Any such limitations on our ability to use our net operating loss carryforwards and other tax assets could adversely impact our business, financial condition and results of operations.

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Risks Related to Ownership of Our Common Stock and this Offering

Upon completion of this offering, our executive officers, directors and principal stockholders will continue to have substantial control over us, which will limit your ability to influence the outcome of important matters, including a change in control.

Upon completion of this offering, our executive officers, directors and each of our stockholders who beneficially own 5% or more of our outstanding common stock and their affiliates, in the aggregate, will beneficially own approximately 55.2% of the outstanding shares of our common stock, based on the number of shares outstanding as of June 30, 2015. As a result, these stockholders, if acting together, will be able to influence or control matters requiring approval by our stockholders, including the election of directors and the approval of mergers, acquisitions or other extraordinary transactions. They may also have interests that differ from yours and may vote in a way with which you disagree and which may be adverse to your interests. This concentrated control may have the effect of delaying or preventing a change in control of our company, could deprive our stockholders of an opportunity to receive a premium for their capital stock and might ultimately affect the market price of our common stock.

An active trading market for our common stock may never develop or be sustained.

We have been approved to list our common stock on the NASDAQ Global Select Market under the symbol “RUN.” However, we cannot assure you that an active trading market for our common stock will develop on that exchange or elsewhere or, if developed, that any market will be sustained. Accordingly, we cannot assure you of the liquidity of any trading market, your ability to sell your shares of our common stock when desired or the prices that you may obtain for your shares of our common stock.

The market price of our common stock may be volatile, and you could lose all or part of your investment.

Prior to the completion of this offering, there has been no public market for shares of our common stock. The initial public offering price of our common stock was determined through negotiation between us and the underwriters. This price will not necessarily reflect the price at which investors in the market will be willing to buy and sell shares of our common stock following this offering. In addition, the market price of our common stock following this offering is likely to be highly volatile, may be higher or lower than the initial public offering price of our common stock and could be subject to wide fluctuations in response to various factors, some of which are beyond our control and may not be related to our operating performance.

Fluctuations in the market price of our common stock could cause you to lose all or part of your investment because you may not be able to sell your shares at or above the price you paid in this offering. Factors that could cause fluctuations in the market price of our common stock include the following:

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In addition, in the past, following periods of volatility in the overall market and the market price of a particular company’s securities, securities class action litigation has often been instituted against these companies. This litigation, if instituted against us, could result in substantial costs and a diversion of our management’s attention and resources.

A total of 79,073,895, or 81.5%, of the outstanding shares of our capital stock after this offering will be restricted from immediate resale but may be sold in the near future. The large number of shares of our capital stock eligible for public sale or subject to rights requiring us to register them for public sale could depress the market price of our common stock.

The market price of our common stock could decline as a result of sales of a large number of shares of our common stock in the market after this offering, and the perception that these sales could occur may also depress the market price of our common stock. Based on shares of our capital stock outstanding as of March 31, 2015, we will have 96,973,895 shares of our capital stock outstanding after this offering. Our executive officers, directors and the holders of substantially all of our capital stock and securities convertible into or exchangeable for our capital stock have entered into market standoff agreements with us or lock-up agreements with the underwriters under which they have agreed, subject to specific exceptions, not to sell any of our capital stock for 180 days following the date of this prospectus. As a result of these agreements, the provisions of our investors’ rights agreement described further in the section titled “Description of Capital Stock—Registration Rights” and the provisions of Rule 144 or Rule 701 under the Securities Act, shares of our capital stock will be available for sale in the public market as follows:

Following the expiration of the lock-up agreements referred to above, stockholders owning an aggregate of up to 64,580,152 shares of our common stock can require us to register shares of our capital stock owned by them for public sale in the United States. In addition, we intend to file a registration statement to register approximately 28,700,000 shares of our capital stock reserved for future issuance under our equity compensation

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plans. Upon effectiveness of that registration statement, subject to the satisfaction of applicable exercise periods, the expiration or waiver of the market standoff agreements and lock-up agreements referred to above and applicable volume and restrictions that apply to affiliates, the shares of our capital stock issued upon exercise of outstanding options to purchase shares of our common stock will be available for immediate resale in the United States in the open market.

Future sales of our common stock may make it more difficult for us to sell equity securities in the future at a time and at a price that we deem appropriate. These sales also could cause the market price of our common stock to decline and make it more difficult for you to sell shares of our common stock.

Anti-takeover provisions contained in our amended and restated certificate of incorporation and amended and restated bylaws, as well as provisions of Delaware law, could impair a takeover attempt.

Our amended and restated certificate of incorporation, amended and restated bylaws and Delaware law contain provisions which could have the effect of rendering more difficult, delaying, or preventing an acquisition deemed undesirable by our board of directors and therefore depress the trading price of our common stock. Among other things, our amended and restated certificate of incorporation and amended and restated bylaws include provisions:

These provisions, alone or together, could delay or prevent hostile takeovers and changes in control or changes in our management.

As a Delaware corporation, we are also subject to provisions of Delaware law, including Section 203 of the Delaware General Corporation law, which prevents certain stockholders holding more than 15% of our outstanding capital stock from engaging in certain business combinations without approval of the holders of at least two-thirds of our outstanding capital stock not held by such stockholder.

Any provision of our amended and restated certificate of incorporation, amended and restated bylaws or Delaware law that has the effect of delaying or preventing a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our capital stock and could also affect the price that some investors are willing to pay for our common stock.

Provisions contained in our amended and restated certificate of incorporation and amended and restated bylaws limit the ability of our stockholders to call special meetings and prohibit stockholder action by written consent.

Our amended and restated certificate of incorporation will provide that our stockholders may not take action by written consent. Instead, any such actions must be taken at an annual or special meeting of our stockholders. As a result, our stockholders will not be able to take any action without first holding a meeting of our stockholders called in accordance with the provisions of our amended and restated bylaws, including advance notice procedures set forth in our amended and restated bylaws. Our amended and restated bylaws will further

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provide that special meetings of our stockholders may be called only by a majority of our board of directors, the chairman of our board of directors, our Chief Executive Officer or our President. As a result, our stockholders are not allowed to call a special meeting. These provisions may delay the ability of our stockholders to force consideration of a stockholder proposal, including a proposal to remove directors.

Provisions contained in our amended and restated certificate of incorporation and amended and restated bylaws could preclude our stockholders from bringing matters before meetings of stockholders and delay changes in our board of directors.

Our amended and restated bylaws will provide advance notice procedures for stockholders seeking to bring business before, or nominate candidates for election as directors at, our annual or special meetings of stockholders. In addition, our amended and restated certificate of incorporation will provide that stockholders may remove directors only for cause. Any amendment of these provisions in our amended and restated bylaws or amended and restated certificate of incorporation would require approval by holders of at least 66 ²⁄₃% of our then outstanding capital stock. These provisions could preclude our stockholders from bringing matters before annual or special meetings of stockholders and delay changes in our board of directors.

Our amended and restated bylaws will provide that the Court of Chancery of the State of Delaware will be the sole and exclusive forum for substantially all disputes between us and our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers or employees.

Our amended and restated bylaws, which will become effective prior to the completion of this offering, provide that, unless we consent to the selection of an alternative forum, the Court of Chancery of the State of Delaware is the sole and exclusive forum for (i) any derivative action or proceeding brought on our behalf, (ii) any action asserting a claim of breach of fiduciary duty owed by any of our directors, officers or other employees to us or to our stockholders, (iii) any action asserting a claim arising pursuant to the Delaware General Corporation Law or (iv) any action asserting a claim governed by the internal affairs doctrine. The choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers or other employees, which may discourage such lawsuits against us and our directors, officers and other employees. Alternatively, if a court were to find the choice of forum provision contained in our amended and restated bylaws to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could harm our business, results of operations and financial condition.

Our management will have broad discretion over the use of proceeds and may apply the proceeds of this offering in ways that may not improve our operating results or increase the value of your investments.

We intend to use the net proceeds to us from this offering for general corporate purposes, including working capital, operating expenses and capital expenditures. We cannot specify with certainty the particular uses of the net proceeds to us from this offering. Accordingly, our management will have considerable discretion in the application of the net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. Until the net proceeds are used, they may be placed in investments that do not produce significant income or that may lose value.

Purchasers in this offering will experience immediate and substantial dilution in the book value of their investment.

The initial public offering price of $14.00 per share is substantially higher than the pro forma net tangible book value per share of our outstanding capital stock upon the completion of this offering. Therefore, if you purchase shares of our common stock in this offering, you will incur immediate dilution of $9.23 in the net tangible book value per share from the price you paid. In addition, investors purchasing shares of our common stock from us in this offering will have contributed 39.0% of the total consideration paid to us by all stockholders

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who purchased shares of our common stock from us, in exchange for acquiring approximately 18.0% of the outstanding shares of our common stock as of March 31, 2015 after giving effect to this offering. The exercise of outstanding options to purchase shares of our common stock will result in further dilution.

If securities or industry analysts do not publish or cease publishing research or reports about us, our business, our market or our competitors, or if they adversely change their recommendations regarding our common stock, the market price of our common stock and trading volume could decline.

The market for our common stock will be influenced by the research and reports that securities or industry analysts may publish about us, our business, our market or our competitors. If any of the analysts who may cover us adversely change their recommendations regarding our common stock, or provide more favorable recommendations about our competitors, the market price of our common stock would likely decline. If any of the analysts who may cover us were to cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause the market price of our common stock and trading volume to decline.

We do not expect to declare any dividends in the foreseeable future.

We do not anticipate declaring any cash dividends to holders of our common stock in the foreseeable future. Consequently, investors may need to rely on sales of our common stock after price appreciation, which may never occur, as the only way to realize any future gains on their investment. Investors seeking cash dividends should not purchase shares of our common stock.

Additional stock issuances could result in significant dilution to our stockholders.

We may issue additional equity securities to raise capital, make acquisitions or for a variety of other purposes. Additional issuances of our stock may be made pursuant to the exercise or conversion of new or existing convertible debt securities, warrants, stock options or other equity incentive awards to new and existing service providers. Any such issuances will result in dilution to existing holders of our stock. We rely on equity-based compensation as an important tool in recruiting and retaining employees. The amount of dilution due to equity-based compensation of our employees and other additional issuances could be substantial.

As an emerging growth company within the meaning of the Securities Act, we will utilize certain modified disclosure requirements, and we cannot be certain if these reduced requirements will make our common stock less attractive to investors.

We are an emerging growth company, and, for as long as we continue to be an emerging growth company, we may choose to take advantage of exemptions from various reporting requirements applicable to other public companies but not to “emerging growth companies.” These exemptions include not being required to have our independent registered public accounting firm audit our internal control over financial reporting under Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. We have in this prospectus utilized, and we plan in future filings with the SEC to continue to utilize, the modified disclosure requirements available to emerging growth companies. As a result, our stockholders may not have access to certain information they may deem important.

We could remain an “emerging growth company” for up to five years following the anniversary of this offering, or until the earliest of (1) the last day of the first fiscal year in which our annual gross revenue reaches or exceeds $1.0 billion, (2) the date that we become a “large accelerated filer” as defined in the Exchange Act, which could occur as early as January 1, 2017 or (3) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the preceding three-year period.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus contains forward-looking statements within the meaning of the federal securities laws, which statements involve substantial risks and uncertainties. Forward-looking statements generally relate to future events or our future financial or operating performance. In some cases, you can identify forward-looking statements because they contain words such as “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these words or other similar terms or expressions that concern our expectations, strategy, plans or intentions. Forward-looking statements contained in this prospectus include, but are not limited to, statements about:

We caution you that the foregoing list may not contain all of the forward-looking statements made in this prospectus.

You should not rely upon forward-looking statements as predictions of future events. We have based the forward-looking statements contained in this prospectus primarily on our current expectations and projections about future events and trends that we believe may affect our business, financial condition, results of operations and prospects. The outcome of the events described in these forward-looking statements is subject to risks, uncertainties and other factors described in the section titled “Risk Factors” and elsewhere in this prospectus. Moreover, we operate in a very competitive and rapidly changing environment. New risks and uncertainties

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emerge from time to time, and it is not possible for us to predict all risks and uncertainties that could have an impact on the forward-looking statements contained in this prospectus. We cannot assure you that the results, events and circumstances reflected in the forward-looking statements will be achieved or occur, and actual results, events or circumstances could differ materially from those described in the forward-looking statements.

The forward-looking statements made in this prospectus relate only to events as of the date on which the statements are made. We undertake no obligation to update any forward-looking statements made in this prospectus to reflect events or circumstances after the date of this prospectus or to reflect new information or the occurrence of unanticipated events, except as required by law. We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make.

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MARKET AND INDUSTRY DATA

This prospectus contains estimates and information concerning our industry, including market size and growth rates of the markets in which we participate, that are based on industry publications and reports. This information involves a number of assumptions and limitations, and you are cautioned not to give undue weight to these estimates. We have not independently verified the accuracy or completeness of the data contained in these industry publications and reports. The industry in which we operate is subject to a high degree of uncertainty and risk due to a variety of factors, including those described in the section titled “Risk Factors.” These and other factors could cause results to differ materially from those expressed in these publications and reports.

Certain information in the text of this prospectus is contained in independent industry publications. The source of these independent industry publications is provided below:

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USE OF PROCEEDS

We estimate that the net proceeds to us from the sale of shares of our common stock in this offering at the initial public offering price of $14.00 per share, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us, will be approximately $221.8 million, or approximately $252.4 million if the underwriters exercise their over-allotment in full. We will not receive any of the proceeds from the sale of shares by the selling stockholders.

We intend to use the net proceeds to us from this offering for general corporate purposes, including working capital, operating expenses and capital expenditures. We cannot specify with certainty the particular uses of the net proceeds to us from this offering. Accordingly, we will have broad discretion in using these proceeds, provided that we comply with the terms and conditions contained in our credit agreements. Pending the use of proceeds to us from this offering as described above, we intend to invest the net proceeds from this offering in short-term and long-term interest-bearing obligations, including government and investment-grade debt securities and money market funds.

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DIVIDEND POLICY

We have never declared or paid any cash dividends on our capital stock. We currently intend to retain all available funds and any future earnings for use in the operation of our business and do not expect to pay any dividends on our capital stock in the foreseeable future. Any future determination to declare dividends will be made at the discretion of our board of directors, subject to applicable laws, and will depend on a number of factors, including our financial condition, results of operations, capital requirements, contractual restrictions, general business conditions and other factors that our board of directors may deem relevant. In addition, our credit agreements contain restrictions on payments of cash dividends.

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CAPITALIZATION

The following table sets forth our cash and cash equivalents, as well as our capitalization, as of March 31, 2015 as follows:

You should read this table together with our consolidated financial statements and related notes, and the sections titled “Selected Consolidated Financial and Other Data” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” that are included elsewhere in this prospectus.

If the underwriters exercise their over-allotment option in full, pro forma as adjusted cash and cash equivalents, additional paid-in capital, total stockholders’ equity, total capitalization and shares outstanding as of March 31, 2015, would be $357.9 million, $640.6 million, $561.8 million, $1,056.6 million and 99,308,895, respectively.

See the section titled “Prospectus Summary—The Offering” for a description of the shares of our capital stock that are or are not reflected as outstanding shares on a pro forma basis in the table above.

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DILUTION

If you purchase shares of our common stock in this offering, your ownership interest will be diluted to the extent of the difference between the initial public offering price per share of our common stock in this offering and the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering. Dilution in pro forma as adjusted net tangible book value per share to investors purchasing shares of our common stock in this offering represents the difference between the amount per share paid by investors purchasing shares of our common stock in this offering and the pro forma as adjusted net tangible book value per share of our common stock immediately after completion of this offering.

Our historical net tangible book value of our common stock as of March 31, 2015 was $240.3 million, or $9.75 per share. Historical net tangible book value per share represents our tangible assets (total assets less intangible assets) less total liabilities and non-controlling interests divided by the number of shares of outstanding common stock.

Our pro forma net tangible book value as of March 31, 2015 was $240.3 million, or $3.02 per share. Our pro forma net tangible book value per share represents the amount of our historical tangible book value as of March 31, 2015, after giving effect to the assumed conversion of all outstanding shares of our convertible preferred stock into an aggregate of 54,840,767 shares of our common stock, which conversion will occur immediately prior to the completion of this offering and excluding the issuance of Additional Securities.

After giving effect to the sale by us of 17,482,268 shares of our common stock in this offering at the initial public offering price of $14.00 per share, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us, our pro forma as adjusted net tangible book value as of March 31, 2015 would have been $462.2 million, or $4.77 per share. This represents an immediate increase in pro forma as adjusted net tangible book value of $1.75 per share to our existing stockholders and an immediate dilution of $9.23 per share to investors purchasing shares of our common stock in this offering. The following table illustrates this dilution:

If the underwriters exercise their over-allotment option in full, the pro forma as adjusted net tangible book value per share of our common stock immediately after the completion of this offering would be $4.96 per share, and the dilution in pro forma net tangible book value per share to investors purchasing shares of our common stock in this offering would be $9.04 per share.

The following table presents, as of March 31, 2015, after giving effect to (i) the assumed automatic conversion of all outstanding shares of our convertible preferred stock into an aggregate of 54,840,767 shares of our common stock, which assumed conversion will occur immediately prior to the completion of this offering, (ii) the exclusion of the issuance of Additional Securities and (iii) the sale by us of 17,482,268 shares of our common stock in this offering at the initial public offering price of $14.00 per share, the difference between the existing stockholders and the investors purchasing shares of our common stock in this offering with respect to the number of shares of our common stock purchased from us, the total consideration paid or to be paid to us, and the

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average price per share paid or to be paid to us, before deducting underwriting discounts and commissions and estimated offering expenses payable by us:

The foregoing table does not reflect any sales of shares of our common stock by existing stockholders in this offering.

Except as otherwise indicated, the above discussion and tables assume no exercise of the underwriters’ over-allotment option. If the underwriters exercise their over-allotment option in full, our existing stockholders would own 79.3% and the investors purchasing shares of our common stock in this offering would own 20.7% of the total number of shares of our common stock outstanding immediately after completion of this offering.

See the section titled “Prospectus Summary—The Offering” for a description of the shares of our capital stock that are or are not reflected as outstanding shares on a pro forma basis in the table and discussion above.

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SELECTED CONSOLIDATED FINANCIAL AND OTHER DATA

The following selected consolidated statement of operations data for the years ended December 31, 2013 and 2014 and selected consolidated balance sheet data as of December 31, 2013 and 2014 have been derived from our audited financial statements included elsewhere in this prospectus. The statements of operations data for each of the three month periods ended March 31, 2014 and 2015 and the balance sheet data as of March 31, 2015 set forth below are derived from our unaudited quarterly consolidated financial statements included elsewhere in this prospectus and contain all adjustments, consisting of normal recurring adjustments, that management considers necessary for a fair presentation of our financial position and results of operations for the periods presented. Our historical results are not necessarily indicative of the results that may be expected in the future, and our interim results are not necessarily indicative of the results to be expected for the full fiscal year. You should read the following selected financial and other data in conjunction with the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements and related notes included elsewhere in this prospectus. See also the consolidated financial statements of MEC, which we acquired in February 2014, as well as the pro forma information contained elsewhere in this prospectus.

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the section titled “Selected Consolidated Financial and Other Data” and the consolidated financial statements and related notes thereto included elsewhere in this prospectus. This discussion contains forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those discussed below. Factors that could cause or contribute to such differences include those identified below and those discussed in the section titled “Risk Factors” included elsewhere in this prospectus.

Overview

We provide clean, solar energy to homeowners at a significant savings compared to traditional utility energy. We have been selling solar energy to residential customers through a variety of offerings since we were founded in 2007. We, either directly or through one of our solar partners, install a solar energy system on a customer’s home and either sell the system to the homeowner or, as is more often the case, sell the energy generated by the system to the homeowner pursuant to a lease or power purchase agreement (“PPA”) with no or low upfront costs. We refer to these leases and PPAs as “customer agreements.” Following installation, a system is interconnected to the local utility grid. The home’s energy usage is provided by the solar energy system, with any additional energy needs provided by the local utility. Through the use of a bi-directional utility meter, any excess solar energy that is not immediately used by the homeowner is exported to the utility grid, and the homeowner receives a credit for the excess energy from their utility to offset future usage of utility-generated energy.

Until 2014, we provided our solar service offerings primarily through our solar partner channel and relied on our solar partners to originate customers for our solar service offerings and procure and install the solar energy systems on our customers’ homes. In February 2014, we purchased the residential sales and installation business of Mainstream Energy Corporation, as well as its fulfillment business, AEE Solar, and its racking business, SnapNrack. We refer to these businesses collectively as “MEC.” Following the MEC acquisition, we began offering our solar service offerings both directly to the homeowner and through our solar partners, which include sales and installation partners, and strategic partners, which include retail partners. In addition, following the acquisition, we began to sell solar energy systems directly to customers for cash. We also sell solar energy panels and other products to resellers through AEE Solar and SnapNrack. As of March 31, 2015, we offered our solar service offerings to customers in 13 states, with approximately 58% of our customers in California, and sold solar energy panels and other products to resellers throughout the United States. The acquisition of MEC provided us with direct-to-consumer installation capabilities in the areas we previously serviced only through our partner channel. We did not expand our solar service offerings to any new state as a result of the acquisition of MEC.

We compete mainly with traditional utilities. In the markets we serve, our strategy is to price the energy we sell below prevailing retail electricity rates. As a result, the price our customers pay to buy energy from us through our solar service offerings varies depending on the state where the customer lives and the local traditional utility that otherwise provides electricity to the customer as well as the prices other solar energy companies charge in that region. Even within the same neighborhood, site-specific characteristics drive meaningful variability in the revenue and cost profiles of each home. Using our proprietary technology, we target homes with advantageous revenue and cost characteristics, which means we are often able to offer pricing that allows customers to save more on their energy bill while maintaining our ability to meet our targeted returns. For example, with the insights provided by our technology, we can offer competitive pricing to customers with homes that have favorable characteristics, such as roofs that allow for easy installation, high electricity consumption, or low shading, effectively passing through the cost savings we are able to achieve on these installations to the homeowner.

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Our ability to offer customer agreements depends in part on our ability to finance the purchase and installation of the solar energy systems by monetizing the resulting customer cash flows and related investment tax credits (“ITCs”), accelerated tax depreciation and other incentives from governments and local utilities. We monetize these incentives under tax equity investment funds which are generally structured as non-recourse project financings. Since inception, we have established 20 investment funds, which represent financing for an estimated $3.1 billion in value of solar energy systems on a cumulative basis. We intend to establish additional investment funds and may also use debt, equity and other financing strategies to fund our growth.

Recent Developments

We present preliminary operating data for the quarter ended June 30, 2015 below. This information is subject to change as we complete our closing procedures for the quarter, and complete financial and operating data for this quarter is not yet available. Our actual results may differ from the information presented due to the completion of our closing procedures, final adjustments and other developments that may arise between the date of this prospectus and the time the financial and operating results for this period are finalized. There can be no assurance that the transactions in our undeployed tax equity pipeline will be consummated at the contemplated levels or at all. In addition, the information below may not be indicative of our performance in subsequent periods and should be read together with “Risk Factors” and the historical financial and operating information provided in this prospectus.

We deployed 42 MW during the quarter ended June 30, 2015, with cumulative megawatts deployed of 472 MW as of June 30, 2015. We also expanded our solar service offerings to customers in two additional states in the quarter ended June 30, 2015, for a total of 15 states. As of June 30, 2015, our pipeline of expected tax equity funding represented capacity for future installations of solar energy systems representing approximately 165 MW.

On July 9, 2015, we entered into a securitization transaction pursuant to which we pooled and transferred qualifying solar energy systems and related lease agreements secured by associated customer contracts (“Solar Assets”) into a special purpose entity (“Issuer”). The Issuer, a wholly-owned indirect subsidiary of Sunrun, issued an aggregate principal amount of $111 million of asset-backed notes (“Notes”) secured by and payable solely from the cash flows generated by the Solar Assets. The Notes represent obligations of the Issuer and are not insured or guaranteed by Sunrun or any of our affiliates. The Notes consist of Class A Notes, in an aggregate principal amount of $100 million, that bear interest at a rate of 4.40% per annum, and Class B Notes, in an aggregate principal amount of $11 million, that bear interest at a rate of 5.38% per annum and are subordinated in right of payment to the Class A Notes. The weighted average interest rate for the Notes is 4.5%. Most of the net proceeds from the issuance of the Notes were used to repay a portion of our lease pass-through financing obligations. We entered into certain management and operations and maintenance agreements with the Issuer pursuant to which we will provide operations and maintenance and administrative services for the Solar Assets.

Investment Funds

Our customer agreements provide for recurring customer payments, typically over 20 years, and the related solar energy systems are generally eligible for ITCs, accelerated tax depreciation and other government or utility incentives. Our financing strategy is to monetize these benefits at a low weighted-average cost of capital. This low cost of capital enables us to offer attractive pricing to our customers for the energy generated by the solar energy system on their homes. Historically, we have monetized a portion of the value created by our customer agreements and the related solar energy systems through investment funds. These assets are attractive to fund investors due to the long-term, recurring nature of the cash flows generated by our customer agreements, the high credit scores of our customers, the fact that energy is a non-discretionary good and our low loss rates. As of March 31, 2015, our average customer under a lease or PPA had a FICO score of over 760 and we had collected approximately 99% of cumulative billings due from customers. In addition, fund investors can receive attractive after-tax returns from our investment funds due to their ability to utilize ITCs, accelerated depreciation and certain government or utility incentives associated with the funds’ ownership of solar energy systems.

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Since inception, we have formed 20 investment funds. Of these 20 funds, 15 are currently active and are described below. We have established different types of investment funds to implement our asset monetization strategy. Depending on the nature of the investment fund, cash may be contributed to the investment fund by the investor upfront or in stages based on milestones associated with the design, construction or interconnection status of the solar energy systems. The cash contributed by the fund investor is used by the investment fund to purchase solar energy systems. The investment funds either own or enter into a master lease with a Sunrun subsidiary for the solar energy systems, customer agreements and associated incentives. We receive on-going cash distributions from the investment funds representing a portion of the monthly customer payments received. We use the upfront cash as well as on-going distributions to cover our costs associated with purchasing and installing the solar energy systems. In addition, we also use debt, equity and other financing strategies to fund our operations. The allocation of the economic benefits between us and the fund investor and the corresponding accounting treatment varies depending on the structure of the investment fund.

In general, our investment funds do not have limits on their terms. However, the economic modeling of the investment funds is generally tied to the 20-year terms of the underlying customer agreements. The terms and conditions of each investment fund vary significantly by investor and by fund. In our active investment funds, the investor commitments range in size from approximately $75 million to $125 million per fund, which allows us to finance portfolios of solar energy systems with a total fair market value (as determined at the time of such investment) ranging from approximately $140 million to $275 million. The fund investor is required to invest the committed capital only if we achieve specified project development milestones within a specified time frame. Our investment funds also require that we meet certain capital deployment deadlines and investment criteria, including certain credit concentrations.

Our rights to receive cash distributions or other payments from the investment funds vary widely depending on a variety of factors, including the investment fund structure, the terms and conditions of the specific investment fund and the performance and composition of the investment fund portfolio of solar energy systems. Only one of our current investment funds includes a guaranteed return to the investor. The rates of return actually received by fund investors is dependent on the performance of the solar energy assets and term of the transaction, as many of our investment funds include put or call options as described below.

Our investment funds typically include an option for us to acquire all of the equity interests that our fund investors hold in the investment funds or an option in favor of our tax equity investors to require us to acquire all of their equity interests in the investment funds. The timing of these call and put options varies by investment fund but is generally at least five years after the installation of the last solar energy system funded by the investment fund. If we were to acquire all of the equity interests in any of our investment funds, we would receive all of the customer payments for the remainder of the term of the customer agreements, with no further distributions made to the tax equity investor. For additional information about these put and call options, please see Note 14 to our consolidated financial statements included elsewhere in this prospectus.

We currently utilize three legal structures in our investment funds, which we refer to as: (i) lease pass-throughs, (ii) partnership flips and (iii) joint venture (“JV”) inverted leases. We reflect lease pass-through arrangements on our consolidated balance sheet as a lease pass-through financing obligation. We record the investor’s interest in partnership flips or JV inverted leases (which we define collectively as consolidated joint ventures) as noncontrolling interests or redeemable noncontrolling interests. These consolidated joint ventures are usually redeemable at our option and, in certain cases, at the investor’s option. If redemption is at our option or the consolidated joint ventures are not redeemable, we record the investor’s interest as a noncontrolling interest and account for the interest using the hypothetical liquidation at book value (“HLBV”) method. If the investor has the option to put their interest to us, we book the investor’s interest as redeemable noncontrolling interest at the greater of the HLBV and the redemption value. Please see “Net Loss Attributable to Common Stockholders” under “Components of Statements of Operations” below for a description of the application of the HLBV method. As of March 31, 2015, one JV inverted lease is not redeemable and is accounted for using a pro rata income allocation.

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The table below provides an overview of our current investment funds:

Lease Pass-Through

Lease Pass-Through. In this investment fund structure, we and the fund investor form two partnership entities which facilitate the pass-through of the ITC or U.S. Treasury grants to the fund investors. In this structure we contribute solar energy systems to an “owner” entity in exchange for interests in the owner entity, and the fund investors contribute cash to a “tenant” entity in exchange for interests in the tenant entity.

Under our lease pass-through structure, in accordance with the provisions of Financial Accounting Standards Board (“FASB”), Accounting Standards Codification Topic 810 (“ASC 810”) Consolidation, we have determined that we are the primary beneficiary of the owner entity, and accordingly, we consolidate that entity. We have also determined that we are not the primary beneficiary of the tenant entity, and accordingly, we do not consolidate that entity.

In this investment fund structure, the investors make a series of large up-front payments as well as, in some instances, subsequent smaller quarterly lease payments through their respective tenant entity to the corresponding owner entity in exchange for the assignment of cash flows from customer agreements and certain other benefits associated with the customer agreements and related solar energy systems. We account for the payments from investors as borrowings by recording the proceeds received as lease pass-through financing obligations. The financing obligation is reduced by recurring customer payments received under the customer agreements assigned to the funds and, if applicable, any U.S. Treasury grants, the fair value of the ITCs monetized and proceeds from the contracted resale of assigned solar renewable energy certificates (“SRECs”), as they are received by the investor over the term of the assignment agreement, which is approximately 20 years. We account for these investment funds in our consolidated financial statements as if we are the lessor in the arrangement with the customer, and we record on our consolidated financial statements activities arising from the customer agreements and any related U.S. Treasury grants, ITCs, incentive rebates and SREC sales. The interest charge on our lease pass-through financing obligations is imputed at the inception of the fund based on the effective interest rate in the arrangement giving rise to the obligation and is updated prospectively as appropriate.

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Consolidated Joint Ventures

Partnership Flips. Under partnership flip structures, we and our fund investors contribute cash into a partnership entity. The partnership uses the cash to acquire solar energy systems developed by us and sells or leases the energy produced under customer agreements. Each fund investor receives a minimum target rate of return, typically on an after-tax basis, which varies by investment fund. Prior to the fund investor receiving its minimum target rate of return, the fund investor receives the majority of the value attributable to customer payments and accelerated tax depreciation, and substantially all of the ITCs. Once the fund investor has received its minimum target rate of return, we receive substantially all of the value attributable to the remaining customer payments and other incentives. In this format, in part owing to the allocation of depreciation benefits to the investor, the investor’s pre-tax return is much lower than the investor’s after-tax return.

Under our partnership flip structure, we have determined that we control the variable interest entity (“VIE”), and accordingly we consolidate the entity and book the investor’s interest as a noncontrolling interest.

Inverted Leases. Under our inverted lease structure, we and the fund investor set up a multi-tiered investment vehicle that is comprised of two partnership entities which facilitate the pass through of the tax benefits to the fund investors. In this structure we contribute solar energy systems to an “owner” partnership entity in exchange for interests in the owner partnership and the fund investors contribute cash to a “tenant” partnership in exchange for interests in the tenant partnership, which in turn makes an investment in the owner partnership entity in exchange for interests in the owner partnership. The owner partnership uses the cash contributions received from the tenant partnership to purchase systems from us and/or fund installation of such systems. The owner partnership leases the contributed solar energy systems to the tenant partnership under a master lease, and the tenant partnership pays the owner partnership rent for those systems both upfront and on an ongoing basis. The tenant partnership sells energy from the solar energy systems to customers pursuant to the terms of the applicable customer agreements. Customer payments made to the tenant partnership are used to pay expenses (including fees to us), make master lease rent payments and pay preferred return distributions to the fund investor. The owner partnership distributes cash to us and the tenant partnership. As the tenant partnership is an investor in the owner partnership, this allows the fund investors to receive a portion of the accelerated tax depreciation and operating losses associated with the ownership of the assets. In this format, in part owing to the allocation of depreciation benefits to the investor, the investor’s pre-tax return is much lower than the investor’s after-tax return. Under our existing JV inverted lease structure, a substantial portion of the value generated by the solar energy systems is provided to the fund investor for a specified period of time, which is generally based upon the period of time corresponding to the expiry of the recapture period associated with the ITCs. After that point in time, we receive substantially all of the value attributable to the long-term recurring customer payments and the other incentives.

Under our JV inverted lease structure, we have determined that we control the VIE, and accordingly we consolidate the entity and book the investor’s interest as a noncontrolling interest or redeemable noncontrolling interest. For all of our JV inverted leases, the redeemable noncontrolling interest is carried on our balance sheet at the greater of the redemption value or the amount calculated under the HLBV method. The HLBV method estimates the amount that, if the fund’s assets were hypothetically sold at their book value, the investor would be entitled to receive according to the liquidation waterfall in the partnership agreement. Generally, the terms of each agreement allocate the value of ITCs earned or grants received by the fund investor to us. Any remaining proceeds are allocated on a pro rata basis to the fund investor and us in accordance with their ownership percentages. We also have one JV inverted lease fund whereby we have a pro rata interest in the entity and we account for the noncontrolling interest’s share of income on a pro rata basis. Accordingly, the noncontrolling interest of this fund is carried on our balance sheet at the cumulative amount of capital contributions, reduced by cumulative distributions paid to the investor, as well as the pro rata share of their income. For further information, see the section entitled “Components of Statements of Operations—Net Loss attributable to Common Stockholders.”

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For further information regarding our investment funds, including the associated risks, see “Risk Factors—Our ability to provide our solar service offerings to homeowners on an economically viable basis depends in part on our ability to finance these systems with fund investors who seek particular tax and other benefits” and Note 14 to our consolidated financial statements appearing elsewhere in this prospectus.

Key Operating Metrics

We regularly review a number of metrics, including the following key operating metrics, to evaluate our business, measure our performance, identify trends affecting our business, formulate financial projections and make strategic decisions. Some of our key operating metrics are estimates. These estimates are based on our management’s beliefs and assumptions and on information currently available to management. Although we believe that we have a reasonable basis for each of these estimates, we caution you that these estimates are based on a combination of assumptions that may prove to be inaccurate over time. Such inaccuracies could be material, particularly given that the estimates relate to cash flows up to 30 years in the future. Underperformance of the solar energy systems, payment defaults by our homeowners, cancellations of signed contracts, system transfers, competition from other distributed solar energy companies, development in the distributed solar energy market and the energy market more broadly, technical innovation, macroeconomic conditions, developments in the regulatory environment, government incentives or other factors described under the section of this prospectus captioned “Risk Factors” could cause our actual results to differ materially from our calculations. Furthermore, other companies may calculate these metrics differently than we do now or in the future, which would reduce their usefulness as a comparative measure.

Megawatts Deployed and Cumulative Megawatts Deployed

We track the electricity-generating capacity of our solar energy systems as measured in megawatts. Because the size of solar energy systems varies greatly due to roof design, sun exposure and other factors, we believe that tracking the aggregate megawatt production capacity of the systems is an indicator of the growth rate of our residential solar service. We track megawatts deployed in a given period as an indicator of asset growth in the period. We track cumulative megawatts deployed as of the end of a given period as an indicator of our historical growth.

Megawatts deployed represents the aggregate megawatt production capacity of our solar energy systems, whether sold directly to customers or subject to customer agreements, for which we have (i) confirmation that the systems are installed on the roof, subject to final inspection, or (ii) in the case of certain system installations by our partners, accrued at least 80% of the expected project cost.

The following sets forth the megawatt production capacity of solar energy systems we have deployed during the period presented and the cumulative megawatts deployed from inception to the end of each period presented:

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Customers

We track the number of customers with solar energy systems that are installed or are under contract to install, net of cancellations, including both customers who purchase solar energy offerings under customer agreements and customers who purchase solar energy systems for cash. Cancellations are shown in the period in which the cancellation occurs, not in the period in which the contract is executed. Our customer agreements have a 10-day cancellation period, and there are no consequences to a customer for cancelling the customer agreement with us during that period. Under the terms of our customer agreements, the consequences to a customer of cancelling the customer agreement with us after the expiration of the 10-day cancellation period is payment in full of the lost 20 years of cash flows expected from the customer agreement plus any lost tax benefits that would have been associated with the solar energy system. The customers who purchase solar energy systems pay cash for the solar energy system and related installation and do not enter into a customer agreement.

Estimated Nominal Contracted Payments Remaining

Our customer agreements, which consist of leases and PPAs, create recurring customer payments over the term of the customer agreement, typically 20 years. We refer to these payment obligations as “estimated nominal contracted payments remaining.” As of March 31, 2015, we had $1.7 billion in estimated nominal contracted payments remaining.

We track the estimated nominal contracted payments remaining as of specified dates. Estimated nominal contracted payments remaining equals the sum of the remaining cash payments that our customers are expected to pay over the terms of their agreements with us, including estimated uncollected prepayments, for systems contracted as of the measurement date. Estimated nominal contracted payments remaining do not reflect potential customer losses, which to date have been insignificant. For a PPA, we multiply the contract price per kilowatt-hour by the estimated annual energy output of the associated solar energy system to determine the estimated nominal contracted payments. For a lease, we include the monthly fees and upfront fee, if any, as set forth in the lease. The estimated nominal contracted payments remaining for a particular PPA or lease decline as the payments are made. Estimated nominal contracted payments include value attributable to customer agreements that are owned by our investment funds. Fund investors have contractual rights to a portion of these nominal contracted payments.

Estimated nominal contracted payments remaining is a forward-looking number, and we use judgment in developing the assumptions used to calculate it. For PPAs, the primary assumption in the calculation is the annual energy output of the associated solar energy systems, which is estimated based on typical annual sun hours given the system’s location, nameplate production capacity of the system, and estimated declines in the solar equipment productivity over the life of the system. Those assumptions may not prove to be accurate over

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time. As of March 31, 2015, approximately $1.5 billion of our estimated nominal contracted payments remaining was associated with PPAs.

The following table sets forth, with respect to our long-term customer agreements, the estimated nominal contracted payments remaining as of the end of each period presented (in thousands):

The estimated nominal contracted payments remaining metric does not factor in renewal or sale of the solar energy system at the end of the initial 20-year term of the customer agreement. At the end of the original contract term, customers have the option to renew the contract at a then-determined price, purchase the system or have us remove the system. The solar energy systems will already be installed on the customer’s home, which we believe will facilitate customer acceptance of our renewal or purchase offer and result in limited additional costs to us.

Estimated Retained Value

Estimated retained value represents the cash flows, discounted at 6% that we expect to receive from homeowners pursuant to customer agreements, net of estimated cash distributions to investors in consolidated joint ventures and estimated operating, maintenance and administrative expenses for systems contracted as of the measurement date. In calculating estimated retained value, we do not deduct customer payments we are obligated to pass through to investors in lease pass-throughs. These amounts are reflected on our balance sheet as long-term and short-term lease pass-through obligations, similar to the way that debt obligations are presented. In determining our financing strategy, we use lease pass-throughs and long-term debt in an equivalent fashion. The longer tenor, pre-tax cost of capital and accounting methodology associated with our lease pass-throughs are more similar to debt than consolidated joint venture funds. We calculate estimated retained value as the sum of estimated retained value under energy contract and estimated retained value of purchase at the end of the initial 20-year term of our customer agreements.

Estimated retained value under energy contract represents the net cash flows during the initial 20-year term of our customer agreements, and estimated retained value of a purchase is the forecasted net present value we would receive upon or following the expiration of the initial contract term. All our customer agreements include a purchase option for the homeowner at the end of the initially contracted term at fair market value, which is typically determined at the time of the expiration of the initial contracted term. Although we assume substantially all customers will purchase the solar energy system at the expiration of the initial contract term, whether a customer does so or renews its customer agreement instead does not make a difference in our calculation of estimated retained value because we expect that the fair market value purchase price of a solar energy system at the end of the initially contracted term will approximate the renewal value to us of that system. We believe the fair market value of a solar energy system on the date of the purchase option would be equal to the present value of cash flows the system would be expected to produce if the customer elected to renew the lease for another 10 years. We estimate this value using established industry convention, which assumes a 10-year renewal at a contract rate that equals 90% of the customer’s contractual rate in effect at the end of the initial contract.

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Because all of our customers are still within the initially contracted term of their customer agreements, we cannot know for certain whether it is more likely that customers will renew their lease, purchase their system, or request system removal. In the absence of such data, we assume it is most likely that customers will exercise their purchase option, and therefore have determined that the useful life of the solar energy system is the initial contractual term. As such, we depreciate our solar energy systems ratably over the useful life to us, generally 20 years, to a residual value, which is estimated to be the fair market value of the system at expiration of the initial term.

Estimated retained value is defined as the net present value, discounted at 6%, of estimated nominal contracted payments remaining and includes contracted SRECs net of estimated cash payments we believe we will be obligated to distribute to tax equity investors, and estimated expenses. All estimated expenses associated with the operations, maintenance, and administrative activities of the solar energy systems are excluded for the purpose of calculating estimated retained value. These expenses vary by investment fund based on the requirements of the particular fund and are estimated as a cost per kilowatt. Based on third-party engineering data, we currently estimate these expenses start at $10.00 per kilowatt for prepaid customer agreements and $23.00 per kilowatt for monthly customer agreements during the initial contract term, both escalated at 2.5% annually. For customers who renew, during the renewal period, these expenses are estimated to have started at $23.00 per kilowatt, escalated at 2.5% annually. We also include the replacement cost of inverters, which have a 10 to 25-year warranty, using the latest available cost estimates. Our other costs and exposure related to this equipment is assumed to be covered by the applicable product’s warranty and our channel partner warranties. Expected distributions to fund investors vary between the different investment funds and are based on individual investment fund contract provisions. For investment funds subject to HLBV accounting (i.e., partnerships flips and most inverted lease transactions), we deduct all estimated future cash distributions to fund investors. For funds not subject to HLBV accounting (e.g., lease pass-throughs and pro rata JV inverted leases), we include all cash flows arising from the fund in estimated retained value, as the amount associated with future liability to investment fund investors is reflected on our balance sheet. Our lease pass-through financing obligation was $77.3 million, $185.4 million, $92.0 million and $196.3 million as of December 31, 2013, December 31, 2014, March 31, 2014 and March 31, 2015, respectively. We and our investor have levered our cash flows from our pro rata JV inverted lease transaction, and this debt obligation is included in our long-term debt, net of current portion. These distributions to fund investors are estimated based on contracted rates, expected sun hours, and the production capacity of the solar equipment installed.

Estimated retained value per watt is calculated by dividing the estimated retained value as of the measurement date by the aggregate nameplate capacity of solar energy systems under customer agreements as of such date.

We have chosen to initially introduce our solar energy systems in states where utility rates, climate conditions and regulatory policies provide for the most compelling market for distributed solar energy. Although we believe that there are many strategic and economic opportunities in other markets for us, estimated retained value per watt may decrease over time to the extent conditions in new or existing markets become less attractive.

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We consider a discount rate of 6% to be appropriate based on recent market transactions that demonstrate that a portfolio of residential solar homeowner contracts is an asset class that can be securitized successfully on a long term basis, with a coupon of less than 5%. The tables below provide a range of estimated retained value amounts if different default, discount and purchase assumptions were used.

Estimated retained value under energy contracts:

Estimated retained value of purchase:

Estimated total retained value:

We also use the methodology for determining estimated retained value to evaluate our project value per watt on a periodic basis. Project value is calculated on a pre-tax, unlevered basis. We calculate project value to determine the total cash proceeds received, or to be received, in respect of megawatts deployed during the reported period by adding certain items to estimated retained value. While retained value provides an estimate of the present value of expected future customer payments after estimated cash distributions to tax equity investors and certain expenses on a cumulative basis, project value provides a discounted estimate of all sources of cash flow, after expenses, of deployed systems during the reported period. As such, we believe project value supplements estimated retained value by providing a comprehensive measure of the present value of all cash generated by our solar energy systems subject to customer agreements.

Project value is calculated as the sum of the following items (all measured on a per-watt basis with respect to megawatts deployed under customer agreements during the period): (i) estimated retained value, (ii) utility or upfront state incentives, (iii) upfront payments from customers for deposits and partial or full prepayments of amounts otherwise due under customer agreements and which are not included in estimated retained value and (iv) finance proceeds from tax equity investors. Project value is calculated for megawatts deployed and therefore excludes customer agreements where the system has not yet been installed. Project value does not take account of the costs of solar energy systems or the costs we incur to sell our solar service offerings and install the related solar energy systems, which we refer to as creation costs. Creation costs include certain installation, sales and marketing and general and administrative costs after subtracting the gross margin on solar energy systems and product sales. Our estimated creation costs were approximately 90% of project value for the quarter ended

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March 31, 2015. For the quarter ended March 31, 2015, our project value per watt from megawatts deployed under customer agreements for the quarter was $5.02 and included the following:

Estimated retained value, estimated retained value per watt and project value per watt are forecasted as of specified dates. They are forward-looking numbers, and we use judgment in developing the assumptions used to calculate them. Those assumptions may not prove to be accurate over time. These metrics do not consider the impact of other events that could adversely affect the cash flows generated by the solar energy system during the contract term and any renewal period or our ability to enter into customer agreements with new customers and generate future cash flows. These events could include, but are not limited to, decreases in the kilowatt hour rates in our customer agreements, decreases in the number of our customers who live in states with higher utility rates, non-payment of obligated amounts by the homeowner or tax equity investor, declines in utility rates for residential electricity or early contract termination by the homeowner as a result of the homeowner purchasing the solar energy system in connection with the sale of the home on which the solar energy system is installed. As of March 31, 2015, we had collected approximately 99% of cumulative billings due from customers. In addition, losses associated with early contract terminations have been immaterial to our business.

Factors Affecting Our Performance

Availability of Capital

Our future success depends on our ability to raise capital from third parties on competitive terms to help finance the deployment of our residential solar energy systems. To date, we have relied heavily on tax equity funding to grow our business and have successfully raised 20 investment funds, which represent financing for an estimated $3.1 billion in value of solar energy systems on a cumulative basis. However, there have been a limited number of potential investment fund investors, due in part to the illiquid nature of these investments and in part to the limited number of investors who are able to utilize the tax benefits generated by these investment funds. The principal tax credit in which fund investors in our industry rely is the Commercial ITC. By statute, the ITC is scheduled to decrease to 10% from 30% of the fair market value of a solar energy system on January 1, 2017. As a result, the amounts that fund investors are willing to invest in the future could decrease or we may be required to provide a larger allocation of customer payments to investors in future funds as a result of this scheduled decrease. For certain of our investment funds, we are contractually required under certain circumstances to make payments to fund investors so that they receive value equivalent to the tax benefits they expected to receive when entering into such funds. For additional information regarding our investment funds, see “—Investment Funds.” In addition, with certain funds, we contribute a portion of the cash that is used to acquire solar energy systems. We intend to establish additional investment funds and to use debt, equity or other financing strategies to fund our operations, including our obligations to make contributions to investment funds. Such other financing strategies may increase our cost of capital.

Investments in Our Growth

A key component of our growth strategy is to continue to invest in our platform and develop or expand our relationships with both solar partners and strategic partners. For example, we invested heavily in building our

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direct-to-consumer capabilities in 2014 after our acquisition of MEC. As a result of the acquisition, our number of employees increased from less than 300 to nearly 1,000. Following the acquisition, we have continued to significantly invest in our direct-to-consumer capabilities. These investments included significantly increasing our installation capacity through the opening of new branches, increasing our hiring in construction and in associated management personnel, and increasing brand and sales and marketing expenses. We have also had to significantly expand our internal controls, procedures and policies to operate this new, direct-to-consumer business. We will continue to make significant investments to drive growth in the future. If these investments do not result in anticipated growth or if we are unable to effectively manage and operate our direct-to-consumer business, our business and results of operations will be harmed. In addition, we are continuing to invest resources in marketing and branding, expanding the technological capabilities of our platform and related infrastructure, and establishing strategic relationships with large retailers and other third parties to generate new customers. These investments have caused and may continue to cause significant variance in our per unit margins and total operating results. If we are unable to reduce our cost structure in the future, we may not be able to achieve profitability, which could have a material adverse effect on our business and prospects. We also continue to invest in time and internal resources identifying and attracting new solar partners to our network and maintaining relationships with existing solar partners. Negotiating relationships with our partners, conducting due diligence before entering into such partner relationships, training such partners and monitoring them for compliance with our standards requires significant time and resources. If we are unsuccessful in establishing or maintaining our relationships with these third parties, our ability to grow our business and our brand recognition could be impaired. Even if we are able to establish and maintain these relationships, we may not be able to execute on our goal of leveraging these relationships to meaningfully expand our business, brand recognition and customer base. This would limit our growth potential and our opportunities to generate significant additional revenue and cash flow.

Government Incentives and Regulation

Our cost of capital, the price we can charge for electricity, the cost of our systems and the demand for residential solar energy is impacted by a number of federal, state and local government incentives and regulations, including tax credits, particularly the ITC, tax abatements, rebate programs and net metering policies. These programs have been challenged from time to time by utilities, governmental authorities and others. As discussed above, the ITC is scheduled to decrease and other incentives may decrease in the future. A reduction in such incentives could adversely affect our results of operations, cost of capital and growth prospects. In addition, we have received U.S. Treasury grants with respect to some of the solar energy systems that we have installed in the past, and like others in our industry, we are subject to an investigation by the U.S. Treasury Department in relation to our applications for these cash grants. See the section titled “Business—Government Regulations and Incentives.”

Although we are not regulated as a utility, federal, state, and local government statutes and regulations concerning electricity heavily influence the market for our products and services. These statutes and regulations often relate to electricity pricing, net metering, incentives, taxation, competition with utilities, and the interconnection of customer-owned electricity generation. In the United States, governments continuously modify these statutes and regulations. Governments, often acting through state utility or public service commissions, change and adopt different rates for residential customers on a regular basis, and these changes can have a negative impact on our ability to deliver savings to customers.

Cost of Solar Energy Systems

The declining cost of solar panels and the raw materials necessary to manufacture them has been a key driver in the pricing of our solar service offerings and customer adoption of solar energy. While historically the prices of solar panels and raw materials have declined, we do not expect significant future declines, and prices for these items could increase in the future due to a variety of factors, including trade barriers, export regulations, regulatory or contractual limitations, industry market requirements and changes in technology and industry

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standards. In the past, we and our solar partners purchased a significant portion of the solar panels and other components used in our solar service offerings from manufacturers based in China. The U.S. government has imposed antidumping and countervailing duties on solar cells manufactured in China. Any increase in the cost of solar panels, other components of solar energy systems and raw materials would increase the costs of our solar service offerings, and could reduce our ability to offer compelling pricing to homeowners, slow our growth and cause our financial results to suffer.

Expansion into New Markets

We currently sell solar energy to residential customers in 15 states. We have focused on these states because the utility-generated energy prices, sun exposure, climate conditions, regulatory policies, and government incentives in these states provide the most compelling market for distributed solar energy. We believe that these states remain significantly underpenetrated, and we intend to further penetrate these markets by investing, marketing and expanding our reach within these states. We also plan to expand into new states that present attractive economics for us and homeowners. These economics will be driven by all of the foregoing factors as well as our ability to leverage our platform and infrastructure and reduce costs. We believe our multi-channel platform allows for rapid and cost efficient entry into new geographic markets, with the flexibility to test new markets through both our partner network and direct-to-consumer solar service offerings.

Evolving Market Opportunity

The residential solar service market is new and still evolving. The future growth of this market and the success of our solar service offerings depend on many factors beyond our control, including recognition and acceptance by homeowners and our ability to provide our solar service offerings cost-effectively. Residential solar service has yet to achieve broad market acceptance and depends on continued governmental incentives and favorable regulatory policies. If this support diminishes, our ability to obtain external financing on acceptable terms, or at all, could be materially and adversely affected. Growth in this market also depends in part on macroeconomic conditions and consumer preferences, each of which can change quickly. Declining macroeconomic conditions, including in the job markets and residential real estate markets, could contribute to instability and uncertainty among homeowners and impact their financial wherewithal, credit scores or interest in entering into long-term customer agreements with us, even if such agreements would generate immediate and long-term savings.

Components of Statements of Operations

Revenue

We generate revenue from (1) operating leases and incentives and (2) solar energy systems and product sales commencing in 2014 as a result of the MEC acquisition.

Operating Leases and Incentives

Operating leases and incentives revenue is primarily comprised of revenue from our customer agreements, solar energy system rebate incentives and sales of SRECs generated by our solar energy systems to third parties, as well as revenue associated with ITCs assigned to investment funds that are classified as lease pass-through arrangements.

We classify and account for our customer agreements as operating leases. We recognize revenue from these agreements either on a straight-line basis over the term of the agreements (in the case of leases) or as we generate and sell energy to customers (in the case of PPAs). The term of these agreements is typically 20 years.

We consider the proceeds from solar energy system rebate incentives to be minimum lease payments under our customer agreements and recognize such payments as revenue over the contract term on a straight-line basis.

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We also apply for and receive SRECs and sell them to third parties in certain jurisdictions for energy generated by our solar energy systems. We recognize revenue related to the sale of SRECs upon delivery to the third party.

Finally, under our investment funds that are classified as lease pass-through arrangements, we recognize revenue by allocating a portion of the cash consideration received from the investors to the estimated fair value of the ITCs assigned to such investment funds. The ITCs are subject to recapture under the Internal Revenue Code (“Code”) if the underlying solar energy system either ceases to be a qualifying property or undergoes a change in ownership within five years of its placed-in-service date. The recapture amount decreases on the anniversary of the permission to operate (“PTO”) date. We recognize revenue as the recapture provisions lapse, with one-fifth of the estimated fair value of the assigned ITC recognized on each anniversary of the solar energy systems’ PTO date over the following five years.

Our quarterly operating leases and incentives revenue has been and will continue to be impacted by seasonality. Energy production is greater in the second and third quarters than in the first and fourth quarters, causing variability in revenue recognized under PPAs. There are also seasonal fluctuations in sales and installations, particularly in the fourth quarter, resulting from decreased sales through the holiday season and weather-related installation delays. In addition, as described above, ITC revenue associated with lease pass-through arrangements is recognized once annually on the anniversary of the PTO date and a high percentage of our existing ITCs have PTO dates that occur in the second quarter.

Solar Energy Systems and Product Sales

Solar energy systems sales are comprised of revenue from the sale of solar energy systems directly to homeowners. We generally recognize revenue from solar energy systems sold to homeowners when we install the solar energy system and it passes inspection by the authority having jurisdiction, provided all other revenue recognition criteria have been met.

Product sales revenue primarily consists of revenue from the sale of solar panels, inverters, racking systems and other solar-related equipment to resellers and is recognized at the time title is transferred, generally upon shipment.

Our quarterly solar energy systems and product sales revenue has and will continue to fluctuate due to a variety of factors, including timing of installation and seasonal factors described above, as well as other factors that may cause homeowners to opt to purchase solar energy systems rather than leasing them.

Operating Expenses

Operating expenses are classified by the related activity and assigned department of our personnel. Personnel costs include salaries, bonuses, benefits and stock-based compensation. Corporate overhead costs include information technology and facilities costs that are allocated based upon the estimated use by personnel in the related classification below.

Cost of Operating Leases and Incentives

Operating leases and incentives cost of revenue is primarily comprised of (1) the depreciation of solar energy systems, as reduced by amortization of U.S. Treasury grant income, (2) amortization of initial direct costs (“IDCs”), (3) lease operations, monitoring and maintenance costs including associated personnel costs, and (4) allocated corporate overhead costs.

Our quarterly gross margin has and will continue to fluctuate, with higher gross margin in the second quarter due to the recognition of higher annual ITC revenue recognized in the period as described above, which has no associated cost recognized in the period.

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Cost of Solar Energy Systems and Product Sales

Solar energy systems cost of revenue and product sales cost of revenue primarily consists of direct and indirect material and personnel costs for solar energy systems installations and product sales. Other costs include engineering and design costs, estimated warranty costs, freight costs, allocated corporate overhead costs, vehicle depreciation costs and personnel costs associated with supply chain, logistics, operations management, safety and quality control.

Sales and Marketing

Sales and marketing expenses include personnel costs as well as advertising, promotional and other marketing related expenses. Sales and marketing expenses also include referral fees, allocated corporate overhead costs, travel and professional services.

As discussed above under “Factors Affecting Our Performance – Investments in Our Growth,” we have invested heavily in sales and marketing and expect these investments to continue at least in the near-term, causing our sales and marketing expenses to increase.

Research and Development

Research and development expenses include personnel costs, allocated corporate overhead costs, and other costs related to the development of our BrightPath software suite as well as our racking equipment.

General and Administrative

General and administrative expenses include personnel costs related to accounting, finance, structured finance services, legal, executive staff and human resources. General and administrative expenses also include professional services and allocated corporate overhead costs as well as certain fees paid to fund investors.

Amortization of Intangible Assets

We acquired intangible assets in connection with the acquisition of MEC. We recorded intangible assets at their fair value of $15.4 million as of the acquisition date. Such intangible assets are being amortized over their estimated useful lives, which range from four months to 10 years. We expect amortization of intangible assets to increase in future periods due to the acquisition of CEE in April 2015.

Non-operating Expenses

Interest Expense, net

Interest expense, net primarily consists of the interest charges associated with long term borrowing and lease pass-through financing obligations. Our revolving line of credit and syndicated term loans are subject to variable interest rates. Our notes payable and bank and non-bank term loans bear fixed interest rates. The interest charge on our lease pass-through financing obligations is imputed at the inception of the related transaction based on the effective interest rate in the arrangement giving rise to the obligation and updated prospectively as appropriate. Interest expense also includes the amortization of deferred financing costs associated with such borrowings, partially offset by a nominal amount of interest income generated from our cash holdings in interest-bearing accounts. In the future we may incur additional indebtedness to fund our operations, and our interest expense would correspondingly increase. As noted in “Contractual Obligations and Other Commitments,” we have entered into a new syndicated working capital facility in April 2015.

Loss on Early Extinguishment of Debt

Loss on early extinguishment of debt consists of loss from early extinguishment of certain non-bank term loans in 2014.

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Other Expenses

Other expenses consist principally of our portion of the net loss in our investment in The Alliance for Solar Choice (“TASC”), which is accounted for under the equity method of accounting.

Income Tax Expense

We are subject to taxation in the United States, where all of our business is conducted. Our effective tax rates differ from the statutory rate primarily due to noncontrolling and redeemable noncontrolling interest adjustments and prepaid tax expense on intercompany gains.

As of December 31, 2014, we had approximately $454.5 million of federal and $409.6 million of state net operating loss carryforwards (“NOLs”), available to offset future taxable income, if any, which expire in varying amounts beginning in 2028 and 2020 for federal and state purposes, respectively, if unused. It is possible that we will not generate taxable income in time to use these NOLs before their expiration.

Net Loss Attributable to Common Stockholders

As discussed above under “—Investment Funds,” 11 of our 15 active investment funds are consolidated joint ventures. We determine the net loss attributable to common stockholders by deducting from net loss the net loss attributable to noncontrolling interests and redeemable noncontrolling interests in these funds. The net loss attributable to noncontrolling interests and redeemable noncontrolling interests represents the fund investors’ allocable share in the results of operations of these investment funds. For these funds, we have determined that the provisions in the contractual arrangements represent substantive profit sharing arrangements, where the allocations to the partners sometimes differ from the stated ownership percentages. We have further determined that, for these arrangements, the appropriate methodology for attributing income and loss to the noncontrolling interests and redeemable noncontrolling interests each period is a balance sheet approach using the HLBV method.

Under the HLBV method, the amounts of income and loss attributed to the noncontrolling interests and redeemable noncontrolling interests in the consolidated statements of operations reflect changes in the amounts the fund investors would hypothetically receive at each balance sheet date under the liquidation provisions of the contractual provisions of these funds, assuming the net assets of the respective investment funds were liquidated at the carrying value determined in accordance with generally accepted accounting principles in the United States (“GAAP”). The fund investors’ interest in the results of operations of these investment funds is initially determined by calculating the difference in the noncontrolling interests and redeemable noncontrolling interests’ claim under the HLBV method at the start and end of each reporting period, after taking into account any contributions and distributions between the fund and the fund investors and subject to the redemption provisions in certain funds. The redeemable noncontrolling interests balance is the greater of the carrying value calculated under the HLBV method or the redemption value. Because the investor contributes cash into the fund to purchase solar energy systems at fair market value which exceeds their carrying value, the noncontrolling interest balance is reduced upon application of the HLBV method. As such, the HLBV method generally allocates more loss to the noncontrolling interest in the first several years after fund formation. After the solar systems have been purchased by the fund, the noncontrolling interest’s contributions decrease substantially. As ongoing distributions are received by the noncontrolling interest, their losses under the HLBV method tend to reverse. While the application of HLBV is performed consistently, the results of that application and its impact on the income or loss allocated between us and the noncontrolling interests and redeemable noncontrolling interests depend on the respective funds’ specific contractual liquidation provisions. The HLBV results are generally affected by the tax attributes allocated to the fund investors including tax bonus depreciation and ITCs or U.S. Treasury grants in lieu of the ITCs, the amount of preferred returns that have been paid to the fund investors by the investment funds, and the allocation of tax income or losses in a liquidation scenario.

The contractual liquidation provisions of our consolidated joint ventures (which include our partnership flips and JV inverted leases) provide that the allocation percentages between us and the investor change, or

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“flip,” under certain circumstances, such as upon the achievement of the fund investor’s targeted rate of return, the passage of time, or the expiration of the recapture period associated with ITCs. Prior to the point at which the allocation percentage flips, the investor is entitled to receive a majority of the value generated by the solar energy systems. At the flip point, we become entitled to receive most of the value. The difference between our current partnership flip structures and JV inverted lease structures that drives a significant impact on our results from the application of the HLBV method is how the flip point is determined.

For investment funds that have a partnership flip structure, the flip point is tied to the achievement of the fund investor’s targeted rate of return. The receipt of tax benefits by the fund investor count towards the achievement of such target, which reduces the amount distributable to the fund investor in a hypothetical liquidation under these funds’ contractual liquidation provisions. This results in a net loss attributable to the fund investor over the periods in which these tax benefits are received as a result of our application of the HLBV method.

For investment funds that have a JV inverted lease structure, the flip point is typically tied to the expiration of the recapture period associated with ITCs. An investor in a fund with a JV inverted lease fund structure will receive tax benefits similar to an investor in a fund that has adopted a partnership structure. However, unlike the partnership flip structure, the receipt of tax benefits by the fund investor does not impact the amount distributable to the fund investor in a hypothetical liquidation under these funds’ contractual liquidation provisions. At the flip point, the fund investor’s claims on the net assets of the investment fund generally decreases. This results in a net loss attributable to the fund investor in the period when the flip occurs as a result of our application of the HLBV method. As discussed above under “—Investment Funds,” we also have one JV inverted lease whereby we have a pro rata interest in the entity, and we account for the noncontrolling interest’s share of income on a pro rata basis.

These differences are a result of the specific contractual provisions for each of our existing funds and are not necessarily indicative of terms for our future partnership flip or JV inverted lease structures. Future investment funds may contain different features than those that we currently employ, and as a result, the application of the HLBV method and resulting allocation of net income or loss may be different from our existing funds.

The amount of loss allocated to noncontrolling interests and redeemable noncontrolling interests for each period presented is as follows:

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Results of Operations

The results of operations presented below should be reviewed in conjunction with the consolidated financial statements and notes thereto included elsewhere in this prospectus.

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Comparison of the Three Months Ended March 31, 2014 and 2015

Revenue

Revenue from operating leases and incentives increased by $3.9 million during the first quarter of 2015 compared to the first quarter of 2014 due to solar energy systems placed in service in the first quarter of 2014 being in service for a full quarter in 2015 versus a partial quarter in 2014, as well as new systems added since the first quarter of 2014, which together increased electricity revenue from operating leases by $4.5 million. Revenue from incentives in the first quarter of 2015 decreased $0.6 million compared to the first quarter of 2014 due to a reduction in SRECs sold. SRECs are recognized when delivered and sales can vary from quarter to quarter.

The $15.4 million increase in revenue from solar energy systems and product sales includes an increase of $7.8 million due to a full quarter of solar energy system and product sales in 2015, compared to two months in 2014 as a result of the February 1, 2014 acquisition of MEC, as well as an increase of $7.6 million due to an increase in sales to new and existing customers, which is a reflection of overall growth following our increase in sales and marketing expense throughout 2014.

Operating Expenses