Quarterly report pursuant to Section 13 or 15(d)

Inventories

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Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consist of the following (in thousands):
March 31, 2021 December 31, 2020
Raw materials $ 255,699  $ 241,095 
Work-in-process 34,073  41,950 
Total $ 289,772  $ 283,045 
The Internal Revenue Service (“IRS”) provided taxpayers a safe harbor opportunity to retain access to the pre-step down tax credit amounts through specific rules released in Notice 2018-59. The Company has sought to avail itself of the safe harbor by incurring certain costs and taking title in the year the Company took delivery, for tax purposes, of the underlying inventory and/or by performing physical work on components that will be installed in solar facilities. As of March 31, 2021 and December 31, 2020, there was approximately $85.3 million and $73.0 million, respectively, related to the safe harbor program within raw materials.