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DEBT AND OFF-BALANCE SHEET ARRANGEMENTS | 3 Months Ended
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Mar. 31, 2026
Debt Disclosure [Abstract] |
DEBT AND OFF-BALANCE SHEET ARRANGEMENTS | NOTE 3 – DEBT AND OFF-BALANCE SHEET ARRANGEMENTS Long-term debt, net of issuance costs, consisted of the following:
(Dollars in thousands) | As of March 31, |  | As of December 31,
2026 |  | 2025
Long-term debt |  |  |
XRC Facility | $ | 145,600 |  |  | $ | 145,600 |
Mercuria Credit Facility | 30,000 |  |  | 30,000 |
Project Granite Facility | 14,152 |  |  | — |
Total principal due for long-term debt | 189,752 |  |  | 175,600 |
Less: Unamortized debt issuance cost | (3,116) |  |  | (2,763) |
Total long-term debt, net of issuance costs | $ | 186,636 |  |  | $ | 172,837 |
XRC Facility In 2024 and 2025, Cape Generating Station 3 LLC and Cape Generating Station 5 LLC entered into loan agreements with XRL ALC, LLC (“XRC Facility”), issuing three promissory notes across three tranches. As of March 31, 2026 and December 31, 2025, outstanding borrowings totaled $145.6 million and $145.6 million, respectively. These amounts are offset by the unamortized debt issuance costs of $2.6 million and $2.8 million, respectively. The estimated fair value of the note was $143.7 million and $140.7 million as of March 31, 2026 and December 31, 2025, respectively, based on a discounted cash flow model based on current market interest rates for similar instruments. The fair value is classified as Level 2 in the fair value hierarchy. The Company was in compliance with all applicable covenants as of March 31, 2026 and December 31, 2025. In April 2026, the Company repaid in full the outstanding borrowings under the XRC Facility. The repayment of the XRC Facility resulted in a loss on extinguishment of debt, including prepayment premiums and the write-off of unamortized debt issuance costs. See Note 17 – Subsequent Events for additional information. Mercuria Credit Facility and Letter of Credit Facility In 2024 and 2025, Fervo HoldCo LLC, a wholly owned subsidiary of the Company, entered into and amended a credit agreement with Mercuria Energy Trading SA (“Mercuria”) to provide liquidity and corporate-level access to capital (“Mercuria Credit Facility”). The Company also entered into a letter of credit facility agreement with Mercuria in 2024 to provide credit support for its contractual and operational obligations (“Mercuria Letter of Credit Facility”). As of March 31, 2026 and December 31, 2025, the Company had $30.0 million outstanding under the Mercuria Credit Facility. In connection with the Mercuria Credit Facility, the Company incurred debt issuance costs of $3.5 million, which are recorded in other long-term assets on the Condensed Consolidated Balance Sheets and are amortized over the term of the agreement. The estimated fair value of the Mercuria Credit Facility was $30.0 million as of March 31, 2026 and December 31, 2025 based on a discounted cash flow model based on current market interest rates for similar instruments. The fair value is classified as Level 2 in the fair value hierarchy. The Company also had $35.5 million outstanding under the Mercuria Letter of Credit Facility as of March 31, 2026 and December 31, 2025, which supports project-level contractual and operational obligations and constitutes an off-balance sheet arrangement. The Company was in compliance with all covenants under the Mercuria Credit Facility and Mercuria Letter of Credit Facility as of March 31, 2026 and December 31, 2025. Project Granite Facility In March 2026, Cape Phase I Borrower LLC and Phase I WellCo LLC (the “Borrowers”), subsidiaries of the Company, entered into a senior secured credit agreement (the “Granite Credit Agreement”) with a syndicate of lenders led by MUFG Bank, Ltd., as administrative agent, and HSBC Bank USA, National Association, as collateral agent, to finance the construction of the Company’s Cape Station (“Cape Station”) Phase I geothermal facility. In connection with the financing, the Borrowers executed customary project finance agreements, including related closing deliverables. The Granite Credit Agreement provides for aggregate commitments of approximately $421.4 million, consisting of (i) a construction loan facility, (ii) a tax credit transfer bridge loan facility, (iii) multiple letter of credit facilities, and (iv) a term loan facility into which construction loans are expected to convert upon satisfaction of specified conversion conditions (collectively, the “Project Granite Facility”). Borrowings under the Project Granite Facility are available during the construction period, subject to satisfaction of customary conditions precedent. Borrowings under the construction loan facility are expected to convert into term loans upon satisfaction of specified conversion conditions, including achievement of substantial completion and delivery of certain project‑level documentation. Borrowings under the construction loan facility bear interest at either (i) the secured overnight financing rate (“SOFR”) or (ii) a base rate, at the Borrowers’ election, in each case plus an applicable margin. The construction loan borrowing outstanding as of March 31, 2026 was a SOFR‑based loan bearing interest at SOFR plus a margin of 3.0%. All SOFR borrowings are subject to a floor of 0.0%. Interest is payable quarterly. Commitment fees accrue on the unutilized portions of the construction loan facility, the tax credit transfer bridge loan facility, and certain letter of credit facilities at a rate equal to 30.0% of the applicable margin and are payable quarterly in arrears. Following conversion, the term loans will amortize on a quarterly basis beginning in 2027, with the remaining outstanding principal due at maturity. The stated maturity date of the term loans is March 31, 2031. Borrowings under the term loan facility bear interest at either SOFR or the base rate, at the Borrowers’ election, plus an applicable margin, with the SOFR margin equal to 3.0% and subject to annual 0.1% increases beginning in March 2029. Base rate borrowings are subject to a margin that is 1.0% lower than the SOFR margin and are subject to the same annual increases. The Granite Credit Agreement includes customary optional and mandatory prepayment provisions. Mandatory prepayments may be required, among other circumstances, upon receipt of certain extraordinary cash proceeds, including proceeds from the transfer of investment tax credits, failure to monetize production tax credits at or above specified thresholds, excess borrowings relative to term loan sizing criteria upon conversion, or upon the occurrence of an event of default, in which case the lenders may also cease making further loan advances and/or declare all outstanding obligations immediately due and payable. As of March 31, 2026, the Company was in compliance with all covenants. Under the terms of the Granite Credit Agreement, the obligations are secured on a first‑priority basis by substantially all assets of the Borrowers, including project‑level assets associated with the Cape Station Phase I geothermal facility, subject to customary permitted liens. On March 6, 2026, the Borrowers issued a construction loan with a stated principal amount of approximately $14.2 million, which was used to finance third-party debt issuance costs, agency fees and upfront lender fees. The financing costs associated with undrawn term loan commitments were recorded as deferred financing costs within other long-term assets on the Condensed Consolidated Balance Sheets. The net carrying amount of the construction loan at issuance was approximately $13.7 million. The difference of approximately $0.5 million between the stated principal amount and the net carrying amount reflects debt issuance costs allocated to the drawn construction loan, which are presented as a direct reduction of the carrying value of long-term debt on the Condensed Consolidated Balance Sheets and are included in unamortized debt issuance costs in the table above. The estimated fair value of the Project Granite Facility was $14.2 million as of March 31, 2026, based on a discounted cash flow model based on current market interest rates for similar instruments. The fair value is classified as Level 2 in the fair value hierarchy. See Note 17 – Subsequent Events for additional information regarding borrowings under the Granite Credit Agreement and related transaction occurring after March 31, 2026. Surety Bond Arrangements As of March 31, 2026 and December 31, 2025, the Company had outstanding surety bonds totaling $59.8 million and $57.5 million, respectively, which constitute off-balance sheet arrangements.

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