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Fair Value
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Fair Value
Our accounting policy for the fair value measurement of cash equivalents and embedded Escalation Protection Plan (“EPP”) derivatives is described in Part II, Item 8 Note 2 - Summary of Significant Accounting Policies in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022.
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
The tables below set forth, by level, our financial assets that are accounted for at fair value for the respective periods. The table does not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):
Fair Value Measured at Reporting Date Using
September 30, 2023Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market funds$489,395 $— $— $489,395 
$489,395 $— $— $489,395 
Liabilities
Derivatives:
Embedded EPP derivatives$— $— $3,948 $3,948 
$— $— $3,948 $3,948 

 Fair Value Measured at Reporting Date Using
December 31, 2022Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market funds$291,903 $— $— $291,903 
$291,903 $— $— $291,903 
Liabilities
Derivatives:
Embedded EPP derivatives$— $— $5,895 $5,895 
$— $— $5,895 $5,895 
Money Market Funds - Money market funds are valued using quoted market prices for identical securities and are therefore classified as Level 1 financial assets.
Embedded Escalation Protection Plan Derivative Liability in Sales Contracts - We estimate the fair value of the embedded EPP derivatives in certain sales contracts using a Monte Carlo simulation model, which considers various potential electricity price curves over the sales contracts’ terms. We use historical grid prices and available forecasts of future electricity prices to estimate future electricity prices. We have classified these derivatives as a Level 3 financial liability.
The changes in the Level 3 financial liabilities during the nine months ended September 30, 2023 were as follows (in thousands):
Embedded EPP Derivative Liability
Liabilities at December 31, 2022
$5,895 
EPP liability settlement(3,160)
Changes in fair value1,213 
Liabilities at September 30, 2023
$3,948 
In June 2023, per an EPP agreement with one of our customers, we paid $3.2 million, which was recorded as a reduction to our balance of embedded EPP derivative liability as of September 30, 2023.
Financial Assets and Liabilities and Other Items Not Measured at Fair Value on a Recurring Basis
Debt Instruments - The senior secured notes and convertible notes are based on rates currently offered for instruments with similar maturities and terms (Level 2). The following table presents the estimated fair values and carrying values of debt instruments (in thousands):
 September 30, 2023December 31, 2022
 Net Carrying
Value
Fair ValueNet Carrying
Value
Fair Value
   
Debt instruments
Recourse:
3% Green Convertible Senior Notes due June 2028
$614,183 613,298 $— — 
2.5% Green Convertible Senior Notes due August 2025
226,309 249,665 224,832 309,488 
10.25% Senior Secured Notes due March 2027
— — 60,960 60,472 
Non-recourse:
3.04% Senior Secured Notes due June 2031
— — 125,787 117,028 
4.6% Term Loan due March 2026
$1,483 1,345 $— —