OPAL Fuels Inc.

1. Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The unaudited condensed consolidated financial statements include the accounts of OPAL Fuels, Inc. and its subsidiaries(the “Company”, “OPAL Fuels”, “we,” “us” or “our”) and reflect all normal recurring adjustments which are, in the opinion of management, necessary for a fair statement of the results of operations for the interim period. In addition, we have consolidated the financial results of jointly owned affiliated companies in which our principal stockholder or other entities have a noncontrolling interest. All intercompany transactions and balances have been eliminated in consolidation. The non-controlling interest attributable to the Company's variable interest entities ("VIE") are presented as a separate component from the Stockholders'equity (deficit) in the condensed consolidated balance sheets and as a non-redeemable non-controlling interest in the condensed consolidated statements of changes in redeemable non-controlling interests, redeemable preferred non-controlling interests and stockholders'equity (deficit).

As of September 30, 2025, the Company held equity interests intwelve VIEs — Pine Bend RNG LLC ("Pine Bend"), Noble Road RNG LLC ("Noble Road"), Paragon RNG LLC ("Paragon"), Emerald RNG LLC ("Emerald") - Paragon project, Sapphire RNG LLC ("Sapphire") - Paragon project, Land2Gas LLC ("Land2Gas"), Atlantic RNG LLC ("Atlantic") - Land2Gas project, Burlington RNG LLC ("Burlington") - Land2Gas project, GREP BTB Holdings LLC ("GREP"), Sunoma Holdings, LLC (“Sunoma”), Central Valley LLC (“Central Valley”), and CMS RNG LLC ("CMS"). Pine Bend, Noble Road GREP, Paragon projects, Land2Gas projects were presented as equity method investments and the remaining three VIEs — Sunoma, Central Valley, and CMS are consolidated by the Company.

On May 9, 2025, the Company acquired a variable interest in CMS, a joint venture formed with a third party to develop, construct, own, and operate a renewable natural gas facility. The Company holds a 70% membership interest in CMS RNG, and the remaining 30% is held by the third-party partner.

Based on an evaluation under ASC 810, Consolidation ("ASC 810"), management determined that CMS RNG is a VIE and that the Company is the primary beneficiary. This conclusion is based on the Company’s power to direct the activities that most significantly impact CMS RNG’s economic performance and its exposure to the entity’s residual returns. As a result, CMS RNG has been consolidated in the Company’s financial statements beginning in the second quarter of 2025.

At the time of formation of CMS RNG, the Company and the third-party partner made net capital contributions of $4,646 and $1,998, respectively. A noncontrolling interest ("NCI") of $1,998 was recognized for the portion of CMS RNG not owned by the Company.

The Company will reassess its primary beneficiary conclusion on an ongoing basis, including upon execution of additional agreements and commencement of commercial operations.

The condensed consolidated balance sheets summarize the major consolidated balance sheet items for consolidated VIEs as of September 30, 2025 and December 31, 2024. The information is presented on an aggregate basis based on similar risk and reward characteristics and the nature of our involvement with the VIEs, such as:

•All of the VIEs are RNG facilities and they are reported under the RNG Fuel Supply segment;

•The nature of our interest in these entities is primarily equity based and therefore carry similar risk and reward characteristics.

The 2024 year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America ("U.S. GAAP"). The interim financial information and notes thereto should be read in conjunction with the Company's latest Annual Report on Form 10-K for the fiscal year ended December 31, 2024 (the "Annual Report") as the interim disclosures generally do not repeat those in the annual financial statements and are condensed in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. The results of operations for thethree and nine months ended September 30, 2025, are not necessarily indicative of results to be expected for the entire fiscal year.

The Company is organized into three operating segments which are RNG Fuel, Fuel Station Services and Renewable Power.

All amounts in these footnotes are presented in thousands of dollars except share and per share data.

Use of estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The significant estimates and assumptions of the Company include the residual value of the useful lives of our property, plant and equipment, the fair value of long-lived assets, the fair value of stock-based compensation, asset retirement obligations, percentage completion for revenue recognition, incremental borrowing rate for calculating the right-of-use lease assets and lease liabilities, the fair value of the reporting units of goodwill and the fair value of derivative instruments. Actual results could differ from those estimates.

The results of operations for the interim periods presented are not necessarily indicative of the results that may be expected for the entire year.

The Company provides all third-party construction contracts with a warranty, typically for a period of one year after substantial completion of the construction project. These warranties are accounted for under ASC 460, Guarantees ("ASC 460"), and not as a separate performance obligation. Generally, the company estimates warranty costs based on historical claims experience, and other factors. Actual warranty claims may differ from the estimates, and adjustments to the liability are made, as necessary. The Company accrued $280 and $171 of warranty reserves under accrued expenses and other current liabilities as of September 30, 2025, and December 31, 2024, respectively.

Related Party Revenues

The Company revised its disclosure of Fuel Station Services revenues from related parties included parenthetically on the face of the condensed consolidated statements of operations to include amounts that were previously excluded. The amounts are immaterial and the revision had no impact on previously reported net income, cash flows, or financial position.

Accounting Pronouncements Adopted

In August 2023, the FASB issued Accounting Standards Update No. 2023-05, Business Combinations- Joint Venture Formations (Subtopic 805-60) ("ASU 2023-05"). The update requires all joint ventures formed after January 1, 2025, upon formation, to apply a new basis of accounting and initially measure its assets and liabilities at fair value. ASU 2023-05 is effective prospectively for joint ventures with a formation date on or after January 1, 2025. During the nine months ended September 30, 2025, the Company formed a joint venture that was excluded from this guidance due to the scope exception applicable to combinations between entities, businesses, or nonprofit activities under common control. The adoption did not have a material effect on the Company’s financial position, results of operations, cash flows or disclosures.

Accounting Pronouncements Not Yet Adopted

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvement to Income Tax Disclosures. The amendments further enhance income tax disclosures, primarily through standardization and disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. The amendments require disclosure of specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold and further disaggregation of income taxes paid for individually significant jurisdictions. The ASU is effective for fiscal years beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the impact that this guidance will have on the disclosures and the Company believes the adoption will not have a material effect on our condensed consolidated financial statements.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which requires additional, disaggregated disclosure about certain income statement line items. The ASU is effective for fiscal years beginning after December 15, 2026, and is required to be applied prospectively with the option for retrospective application. The Company is currently evaluating the impact that this guidance will have on the disclosures within our condensed consolidated financial statements.

In July 2025, the Financial Accounting Standards Board (“FASB”) issued ASU 2025‑05, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. The amendments provide a practical expedient applicable to all entities for estimating expected credit losses on current accounts receivable and current contract assets that arise under ASC 606, permitting the assumption that existing conditions at the balance‑sheet date will remain unchanged over the remaining life of such assets. The amendments are effective for fiscal years beginning after December 15, 2025, including interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact that this guidance will have on the disclosures within our condensed consolidated financial statements.

In September 2025, the FASB issued ASU 2025‑06, Intangibles — Goodwill and Other (Topic 350): Internal‑Use Software — Targeted Improvements to the Accounting for Internal‑Use Software. The amendments modernize the guidance for capitalizing costs of internally‑developed software by removing references to defined development stages and instead focusing on two principal criteria: (1) management has authorized and committed to funding the project, and (2) it is probable that the project will be completed and the software will be used to perform the intended function. The ASU is effective for fiscal years beginning after December 15, 2027, including interim periods within those years, with early adoption permitted. The Company is currently evaluating the impact that this guidance will have on the disclosures within our condensed consolidated financial statements.

Earnout Liabilities

In connection with the Business Combination completed in July 2022 and pursuant to a sponsor letter agreement, ArcLight CTC Holdings II, L.P. agreed to subject 10% of its Class A common stock (received as a result of the conversion of its ArcLight Class B ordinary shares immediately prior to the closing) to vesting and forfeiture conditions relating to VWAP targets for the Company's Class A common stock sustained over a period of 60 months following the closing. As of September 30, 2025 and December 31, 2024, the number of shares subject to forfeiture was 716,650 (the "Sponsor Earnout Awards").

For the three and nine months ended September 30, 2025 the Company recorded a gain from the Sponsor Earnout Awards of $— and $281, respectively, in its condensed consolidated statements of operations. For the three and nine months ended September 30, 2024, the Company recorded a gain of $278 and $1,457, respectively, in its condensed consolidated statements of operations. As of September 30, 2025 and December 31, 2024, the Company recorded a Sponsor Earnout liability of $23 and $304, respectively, as part of other long-term liabilities on its condensed consolidated balance sheets.

Redeemable non-controlling interests

Redeemable non-controlling interests represent the portion of the Company's consolidated subsidiary OPAL Fuels LLC, that the Company does not own. The Redeemable non-controlling interest represents 144,399,037 Class B and D Units issued by OPAL Fuels to the prior investors. The Company allocates net income or loss attributable to Redeemable non-controlling interest based on weighted average ownership interest during the period. The net income or loss attributable to Redeemable non-controlling interests is reflected in the condensed consolidated statements of operations.

At each balance sheet date, the mezzanine equity classified Redeemable non-controlling interests is adjusted up to their maximum redemption value if necessary, with an offset in Stockholders' equity (deficit). As of September 30, 2025, the maximum redemption value was $342,528.

Parts Inventory

Parts inventory, also referred to as supplies inventory, consists of shop spare parts inventory and construction site parts inventory. The substantial amount of inventory is identified, tracked and treated as finished goods.

Revenues

Disaggregation of Revenue

The following table shows the disaggregation of revenue according to product line:

(1)Includes revenues of $0 and $5,151 respectively, for the three months ended September 30, 2025 and 2024, from customers domiciled outside of United States. Includes revenues of $0 and $13,439 respectively, for the nine months ended September 30, 2025 and 2024, from customers domiciled outside of United States.

(2) Includes management fee revenues earned from management of operations of equity method entities.

(3)Lease revenue relates to revenue from fuel purchasing agreements and power purchase agreements where we determined that we transferred the right to control the use of the power plant to the purchaser.

For the three and nine months ended September 30, 2025 and 2024, the third party construction revenue was recognized over time, and the remainder was for products and services transferred at a point in time.

Contract Balances

The following table provides information about receivables, contract assets, and contract liabilities from contracts with customers:

During the nine months ended September 30, 2025, the Company recognized revenue of $5,006 that was included in "Contract liabilities" at December 31, 2024. During the nine months ended September 30, 2024, the Company recognized revenue of $3,746 that was included in "Contract liabilities" at December 31, 2023.

Environmental credits held for sale

For the three months ended September 30, 2025 and 2024, the Company recorded $4,515 and $1,443 as part of Cost of sales - Fuel Station Services in its condensed consolidated statements of operations to adjust environmental credits held for sale to lower of cost and net realizable value. For the nine months ended September 30, 2025 and 2024, the Company recorded $15,055 and $8,293 as part of Cost of sales - Fuel Station Services in its condensed consolidated statements of operations to adjust environmental credits held for sale to lower of cost and net realizable value.

Fuel Station Services Construction Backlog

The Company's remaining performance obligations ("Backlog") represent the unrecognized revenue value of its contract commitments. The Company's Backlog may significantly vary each reporting period based on the timing of major new contract commitments. At September 30, 2025, the Company had a Backlog of $51,484.

Significant Customers, Vendors and Concentration of Credit Risk

For the three and nine months ended September 30, 2025, one customer accounted for 34% and 38%, respectively, of the revenue. For the three and nine months ended September 30, 2024, two customers accounted for 56% and 54% of the revenue, respectively. At September 30, 2025, two customers accounted for 55% of accounts receivable. At December 31, 2024, two customers accounted for 50% of accounts receivable.

As of September 30, 2025, one vendor accounted for 10% of the accounts payable. As of December 31, 2024, one vendor accounted for 17% of the accounts payable. Vendor concentration percentages are calculated excluding statutory obligations to government authorities.

Investment Tax Credits

In the first, second, and third quarters of 2025, the Company sold to third-party purchasers certain transferable Investment Tax Credits ("ITCs") that had been generated by the Company from its investments in the Renewable Natural Gas segment.

The Company elected to consider expected transfers of the credits in assessing their realizability as part of the valuation allowance analysis and recognize changes in the estimated proceeds as an adjustment to its valuation allowance. The Company accounted for the ITC sale in accordance with ASC 740, Income Taxes("ASC 740"), by electing the flow-through method to recognize the ITC benefit when it arises.

During the three and nine months ended September 30, 2025, the Company received net proceeds from the sale of tax credits totaling $14,567 and $36,290, respectively. During the three and nine months ended September 30, 2024, the Company received net proceeds from the sale of tax credits totaling $8,906. These amounts were received in cash and recorded as income tax benefit. The cash flows related to the total income tax benefits are presented in the statement of cash flow in the ‘Net income’ line item within operating activities. Additionally, during the three and nine months ended September 30, 2025, the Company incurred legal and insurance fees associated with the transactions totaling $1,873 and $4,510, respectively. During the three and nine months ended September 30, 2024, the Company incurred legal and insurance fees associated with the transactions totaling $1,182. These amounts represent buyer’s expenses paid by the Company and are recorded as part of the income tax benefit. The transaction costs are deductible for income tax purposes.

2. Investment in Other Entities

The following table shows the movement in Investment in Other Entities:

(1) Recorded as part of cash flows from operating activities for the nine months ended September 30, 2025.

(2) Recorded as part of cash flows from investing activities for the nine months ended September 30, 2025.

(3) Reflected in income from equity method investments in the condensed consolidated statements of operations for the nine months ended September 30, 2025.

The following table summarizes the statement of operations information for equity method investments and the Company's portion of net income from equity method investments:

(1)Net income from equity method investments represents the Company's portion of the net income from equity method investments including amortization of any basis differences.

A summary of financial information for our portion of the assets and liabilities in equity method investees in the aggregate is as follows:

3. Borrowings

The following table summarizes the borrowings under the various debt facilities as of September 30, 2025 and December 31, 2024:

As of September 30, 2025, principal maturities of debt are expected as follows, excluding any undrawn debt facilities as of the date of the condensed consolidated balance sheets:

Amended OPAL Term Loan and Revolving Loan

On March 3, 2025, OPAL Fuels Intermediate HoldCo LLC, as the borrower (the “Borrower”), certain subsidiaries of the Borrower, as guarantors (the “Guarantors”), the lenders and issuers of letters of credit party thereto and Bank of America, N.A. as the administrative agent (the “Administrative Agent”) entered into that certain Amendment No. 1 to Credit and Guarantee Agreement (the “Credit Agreement Amendment”), with respect to that certain Credit and Guarantee Agreement (the “Credit Agreement”) dated September 1, 2023, by and among the Borrower, the Administrative Agent, the financial institutions from time to time parties thereto as lenders and as issuers of letters of credit, and the other agents and persons from time to time party thereto (as amended, restated, amended and restated, supplemented or otherwise modified and in effect from time to time).

The Credit Agreement Amendment makes certain changes to the applicability of certain financial covenants and modifies other covenants to clarify the use of loan proceeds. Additionally, the Credit Agreement Amendment permits the organizational restructuring of the Guarantors in a manner designed to facilitate the sale of federal investment tax credits and the ability to raise additional future capital.

The Credit Agreement Amendment also eases the conditions precedent to making new Projects eligible for borrowing under the Credit Agreement, extends the availability period for delay draw term loans under the Credit Agreement through March 5, 2026, and extends the commencement of repayment of such term loans until March 31, 2026. The Amendment was accounted for as a modification in the nine month period ended September 30, 2025.

In connection with the Credit Agreement Amendment, the Borrower paid the Administrative Agent, for the account of each lender, a one-time nonrefundable fee of $1,250. These costs have been recorded as a direct reduction against the debt and amortized over the life of the associated debt as a component of interest expense using the effective interest method.

During the nine months ended September 30, 2025, the Company borrowed $40,000 under its term loan, drew $20,000 from its revolving loan and repaid $15,000 on its revolving loan. As of September 30, 2025, the Company utilized $34,517 of availability under the revolver loan to provide for the issuance of letters of credit to support the operations of the Borrower and the Guarantors.

The Company has the ability, during the delayed draw availability period and subject to the satisfaction of certain credit and project-related conditions precedent, to join other newly acquired subsidiaries with comparable renewable projects in development under the credit facility for comparable funding. As of September 30, 2025, the Company is in compliance with the financial covenants under the OPAL Term Loan. The amounts outstanding under the Credit Agreement are secured by the assets of the indirect subsidiaries of OPAL Intermediate Holdco.

Sunoma Loan

On August 27, 2020, Sunoma, an indirect wholly-owned subsidiary of the Company entered into a debt agreement (the "Sunoma Loan Agreement") with Live Oak Banking Company for an aggregate principal amount of $20,000 that was increased to $23,000 in 2022. As of September 30, 2025, Sunoma is in compliance with the financial covenants under the Sunoma Loan Agreement.

The Company also utilized $968 for the issuance of letters of credit to support the operations of the Borrower. The amounts outstanding under the Sunoma Loan are secured by the assets of Sunoma.

For the three and nine months ended September 30, 2025, the weighted average effective interest rate including amortization of debt issuance costs on OPAL Term Loan was 8.8% and 8.5% respectively. For the three and nine months ended September 30, 2025, the interest rate on the Sunoma Loan was 8.7%.

For the three and nine months ended September 30, 2024, the weighted average effective interest rate on OPAL Term Loan including amortization of debt issuance costs was 9.2% and 8.7%, respectively. For the three and nine months ended September 30, 2024, the interest rate on the Sunoma loan was 8.1% and 8.2%, respectively.

The following table summarizes the Company's total interest expense for the three and nine months ended September 30, 2025 and 2024:

(1)Excludes $841 and $1,019 of interest capitalized and recorded as part of Property, Plant and Equipment for the three months ended September 30, 2025 and 2024. Excludes $2,082 and $3,093 of interest capitalized and recorded as part of Property, Plant and Equipment for the nine months ended September 30, 2025 and 2024.

4. Leases

Lessor contracts

Fuel provider agreements

Fuel provider agreements ("FPAs") are for the sale of brown gas, service and maintenance of sites. The Company is contracted to design and build a Fueling Station on the customer's property in exchange for the Company providing CNG/RNG to the customer for a determined number of years. We have determined that the FPAs contain a lease component for the use of the Fueling Station in addition to the non-lease components related to providing CNG/RNG as well as providing all-inclusive maintenance and warranty services.

Power purchase agreements

Power purchase agreements ("PPAs") are for the sale of electricity generated at our Renewable Power facilities. All of our Renewable Power facilities operate under fixed pricing or indexed pricing based on market prices. Two of our Renewable Power facilities transfer the right to control the use of the power plant to the purchaser and are therefore classified as operating leases.

(1) Included in Fuel Station Service revenues

(2) Included in Renewable Power revenues

Lessee contracts

During the nine months ended September 30, 2025, the Company derecognized the right-of-use (ROU) asset and corresponding lease liability associated with a site lease following a formal release from all future lease obligations by the vendor under the current agreement. The ROU asset had a carrying value of approximately $5,397 at the time of termination. The derecognition resulted in $600 gain recognized in other income.

5. Derivative Financial Instruments and Fair Value Measurements

Interest rate swaps

The Company records the fair value of the interest rate swap as an asset or liability on its balance sheet. This instrument is classified as Level 2 in the fair value hierarchy. The effective portion of the swap is recorded in accumulated other comprehensive income. The Company expects to release $84 from the other comprehensive income in the next twelve months.

The location and amounts of interest rate swaps and their fair values in the condensed consolidated balance sheets are:

The effect of interest rate swaps on the condensed consolidated statement of operations were as follows:

Commodity swap contracts

In February 2025, the Company entered into a power purchase and sale agreement with NextEra Energy Marketing, LLC (together with its affiliates, "NextEra") for sale of electricity over the period from March through December 2025, with a fixed contract price. The forward contract is expected to be settled by physical delivery of electricity on a monthly basis. The Company elected the normal purchase normal sale exclusion and will not apply fair value accounting under ASC 815, Derivatives and Hedging, ("ASC 815").

Additionally, during the nine months ended September 30, 2025, the Company entered into multiple ISDA agreements with JPMorgan Chase, Merrill Lynch, and Investec Bank for pay-variable, receive-fixed, cash-settled natural gas commodity swaps. The Company applied fair value accounting under ASC 815 for these transactions.

The following table summarizes the effect of commodity swaps accounted for as derivatives under ASC 815 on the condensed consolidated statements of operations for the three and nine months ended September 30, 2025 and 2024:

The following table summarizes the derivative assets and liabilities related to commodity swaps as of September 30, 2025 and December 31, 2024:

Other derivative liabilities

On July 21, 2022, the Company recorded a derivative liability for the Sponsor Earnout Awards and the OPAL Earnout Awards. The OPAL Earnout Awards expired in December 2024. The change in fair value on Sponsor Earnout and OPAL Earnout Awards is recorded as change in fair value of derivative instruments, net in the condensed consolidated statement of operations for the three and nine months ended September 30, 2025 and 2024.

The following table summarizes the effect of change in fair value of other derivative liabilities on the condensed consolidated statements of operations for the three and nine months ended September 30, 2025 and 2024:

Fair value measurements

The carrying amount of cash and cash equivalents, accounts receivable, net, and accounts payable and accrued expenses approximates fair value due to their short-term maturities.

The carrying value of the Company's long-term debt, classified as Level 2 within the fair value hierarchy, approximates its fair value as of as of September 30, 2025 and December 31, 2024, because the interest rates are variable and therefore reflect current market conditions.

The Company accounts for asset retirement obligations by recording the fair value of a liability for an asset retirement obligation in the period in which it is incurred and when a reasonable estimate of fair value can be made. The Company estimated the fair value of its asset retirement obligations based on discount rates ranging from 5.8% to 8.5%.

The fair value of the Sponsor Earnout Awards as of September 30, 2025 was determined using a Black-Scholes valuation model with a distribution of potential outcomes on a daily basis over the 2.0 years remaining in the vesting window. Assumptions used in the valuation are as follows:

•Current stock price — The Company's closing stock price of $2.20 as of September 30, 2025;

•Expected volatility —50% based on historical and implied volatilities of selected industry peers deemed to be comparable to our business corresponding to the expected term of the awards;

•Risk-free interest rate —3.6% based on the U.S. Treasury yield curve in effect at the time of issuance for zero-coupon U.S. Treasury notes with maturities corresponding to the expected 1.8 year term of the earnout period;

•Dividend yield -zero.

Convertible note receivable

In July 2024, the Company purchased a convertible note pursuant to which the Company has the right to convert the note into shares of Class A common stock of the investee for $750. In the third quarter of 2025, the investee underwent an exit event, resulting in the note settlement. The Company received $1,377 in cash proceeds, with an additional $198 remaining in escrow recorded under prepaid expense and other current assets.

There were no transfers of assets between Level 1, Level 2, or Level 3 of the fair value hierarchy as of September 30, 2025.

The Company's assets and liabilities that are measured at fair value on a recurring basis include the following as of September 30, 2025 and December 31, 2024, set forth by level, within the fair value hierarchy:

(1) Includes balances in money market accounts of $26,213 and $19,786, respectively as of September 30, 2025 and December 31, 2024.

6. Related Parties

Related parties are represented by Fortistar and other affiliates, subsidiaries, entities under common control with Fortistar or NextEra, and equity method investments.

Purchase and sale agreement for environmental attributes

In January 2025, the EPA implemented a new framework in which (1) RNG producers are eligible to claim a “K-1”RINs on their volumes of RNG produced, and (2) dispensers are eligible to claim “K-2” RINs on natural gas volumes dispensed as truck fuel, provided they also have a corresponding K-1 RIN to demonstrate the renewable sourcing of gas. The creation of distinct “K-1” and “K-2” RINs creates flexibility for RNG producers to generate and sell K-1 RINs to dispensers independent of the K-2 registration process or dispensing activities. K-1 RINs are only useful for the purpose of registering a K-2 RIN, and K-2 RINs are used to record the environmental offset (similar to a traditional RIN). The introduction of K-1 and K-2 RINs gives rise to a new form of commercial transaction for Opal that is distinct from previous RIN minting arrangements.

On March 26, 2025, the Company entered into a NAESB Base Contract with NextEra (together with certain special conditions, a letter agreement, and an RNG addendum, the "NAESB Contract"). In accordance with the NAESB Contract, the Company could enter into transaction confirmations on a periodic basis for the sale of RNG generated by the RNG Fuels business and NextEra could elect to utilize the Company to market such RNG to generate RINs for NextEra. In March, June and September 2025, the Company and NextEra entered into such transaction confirmations.

The Company concluded that production and dispensing services represent separate performance obligations. Control over K-1 RINs transfers at the time of gas generation or upon delivery of the RINs. Revenue is recognized at the time control is transferred. The consideration associated with dispensing services is recognized into revenue by the Company when it satisfies its performance obligation by pairing the paperwork associated with the dispensing.

For the three and nine months ended September 30, 2025, the Company recognized revenues of $4,982 and $15,585, respectively, under the NAESB contract, which were recorded as part of Revenues - RNG Fuel.

Service agreements with related parties

On March 17, 2025, Fortistar, through its subsidiary Wasatch RNG LLC (“Wasatch RNG”), acquired all of the limited liability company interests outstanding in Alpro SD, LLC (“Alpro” and such acquired interest, the “Alpro Interest”). Alpro owns a 50% limited liability company interest in Wasatch Resource Recovery, LLC (the “Project” or “Wasatch” and such ownership interest, the “Wasatch Interest”) and a 50% tenancy-in-common interest in certain real estate and operating assets used by Wasatch (the “Project Interest”). The Project captures and converts biogas generated from food waste to produce pipeline quality RNG. The Project generates revenue from long-term contracted gas sales, tipping fees, and digestate (fertilizer) sales.

In connection with the acquisition, Fortistar Services 2 LLC and OPAL Fuels LLC entered into an amendment to its existing Administrative Services Agreement, pursuant to which OPAL Fuels will provide certain services to Wasatch RNG in exchange for certain agreed upon fees and expense reimbursements. These services include oversight of the plan to improve the operations and productivity of the Project. Either party may, at its sole election and on ninety (90) days advance written notice, terminate Company's provision of services to Wasatch, at which time the Management Fee and the Wasatch Remediation Fee shall also terminate.

Additionally, Wasatch RNG and OPAL Fuels entered into an Option Agreement, pursuant to which Wasatch RNG granted an option to OPAL Fuels to purchase the Alpro Interest. The exercise period of the option commenced upon closing of the acquisition and will terminate on the third anniversary of the closing of the acquisition, or ninety (90) days following a change of control of OPAL Fuels. The exercise price of the option would be determined such that Wasatch RNG would earn an internal rate of return on its invested capital of 10% percent per year if the option is exercised in the first year,15% per year if exercised in the second year, and 20% per year if exercised in the third year.

Wasatch RNG is determined to be a VIE due to their having insufficient equity investment at risk to finance their activities without additional subordinated financial support, and due to the fact that the holder of equity at risk in Wasatch RNG lacks the right to fully receive the expected residual returns. However, we are not the primary beneficiary of this VIE because we do not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance. Accordingly, we do not consolidate the results of operations, financial condition and cash flows of Wasatch RNG in our condensed consolidated financial statements.

During the first quarter of 2025, Scott Contino, CFO of Fortistar, served as Interim CFO of the Company. Pursuant to the Interim Services Agreement, the Company paid Fortistar an agreed hourly rate, such that the monthly fee did not exceed $50, on a cumulative basis.

The following table summarizes revenues recorded from related parties:

(1)Represents RIN and LCFS sales to NextEra.

(2)Represents revenue earned under ISDA and REC sales agreements with NextEra.

(3)Represents environmental processing fees earned under agreements with equity method investments, related to the generation and marketing of RINs and LCFS.

(4)Represents management fees earned under an agreement with Fortistar.

The following table summarizes the various fees recorded under the service agreements with related parties which are included in "Selling, general, and administrative" expenses:

The following table presents the various balances for related parties included in our condensed consolidated balance sheets as of September 30, 2025 and December 31, 2024:

(1) Includes staffing, management and IT services.

Class D Common Stock Conversion

On April 23, 2025, our ultimate controlling shareholder, Fortistar, through its subsidiary OPAL Holdco LLC, exchanged 50 million shares of Class D common stock of the Company held by it, each of which is entitled tofive votes per share on all matters on which stockholders generally are entitled to vote, for an equal number of shares of newly issued Class B common stock of the Company, each of which is entitled toone vote on such matters. This transaction had no effect on the economic interest in the Company held by Fortistar.

7. Reportable Segments and Geographic Information

The Company is organized into three operating segments based on the characteristics of its renewable power generation, dispensing portfolio, production and sale of renewable gas, and nature of other products and services.

Our reportable segments disclosure is aligned with the information and internal reporting provided to our CODM. Our Co-CEOs, Adam Comora and Jonathan Maurer, jointly fulfill the role of the CODM. The CODM evaluates performance based on segment net income (loss). For all of the segments, the CODM uses segment net income (loss) in the annual budgeting and monthly forecasting process. The CODM considers budget-to-current forecast and prior forecast-to-current forecast variances for segment net income (loss) on a monthly basis for evaluating performance of each segment and making decisions about allocating capital and other resources to each segment.

Thethree operating segments are RNG Fuel, Fuel Station Services and Renewable Power. The Company has determined that each of thethree operating segments meets the characteristics of a reportable segment under U.S. GAAP.

The Corporate entity is not determined to be an operating segment but is discretely disclosed for purposes of reconciliation of the Company’s consolidated financial statements, and though not denoted as an operating segment, significant expenses are noted within the segment.

The following table reflects the financial data used to calculate each reportable segment’s net income (loss) and includes reconciliations to Opal’s consolidated revenue and consolidated net income (loss) for the three and nine months ended September 30, 2025:

(1) The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker. Intersegment expenses are included within the amounts shown.

(2) Other segment items for each reportable segment includes:

•Fuel Station Services - gain on RNG dispensing, and gain on asset disposal

•Corporate - information technology expense, legal and professional advisor fees, and other overhead expenses

Geographic Information: The Company's assets and revenue generating activities are domiciled in the United States.

The following table reflects certain other financial data for the reportable segments as of September 30, 2025:

For the nine months ended September 30, 2025, the Company made the following cash payments for capital expenditures:

The following table reflects the financial data used to calculate each reportable segment’s net income (loss) and includes reconciliations to Opal’s consolidated revenue and consolidated net income (loss) for the three and nine months ended September 30, 2024:

(1) The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker. Intersegment expenses are included within the amounts shown.

(2) Other segment items for each reportable segment includes:

•Fuel Station Services - gain on recognition of RINs

•Corporate - gain on mark-to-market for OPAL and Sponsor Earnout Awards, loss on extinguishment of debt, insurance other overhead expenses

Geographic Information: The Company's assets and revenue generating activities are domiciled in the United States.

The following table reflects certain other financial data for the reportable segments as of December 31, 2024:

For the nine months ended September 30, 2024, the Company made the following cash payments for capital expenditures:

The tables below outline the revenue from our major customer, along with respective percentages of revenue by each segment.

Customer B was below 10% of the consolidated revenues in three and nine months ended September 30, 2025:

8. Redeemable non-controlling interests, Redeemable preferred non-controlling interests and Stockholders' Equity (Deficit)

Common stock

Share conversion

On April 23, 2025, our ultimate controlling shareholder, Fortistar, through its subsidiary OPAL Holdco LLC, exchanged 50 million shares of Class D common stock of the Company held by it, each of which is entitled tofive votes per share on all matters on which stockholders generally are entitled to vote, for an equal number of shares of newly issued Class B common stock of the Company, each of which is entitled toone vote on such matters. This transaction had no effect on the economic interest in the Company held by Fortistar.

As of September 30, 2025, there are (i)30,631,960 shares of Class A common stock issued and 28,996,177 outstanding, (ii)121,500,000 shares of Class B common stock issued and outstanding (shares of Class B common stock do not have any economic value except voting rights as described below), (iii)no shares of Class C common stock issued and outstanding and (iv)22,899,037 shares of Class D common stock (shares of Class D common stock do not have any economic value except voting rights as described below).

ATM Program

On November 17, 2023, the Company entered into an At Market Issuance Sales Agreement (the “Sales Agreement”) with B. Riley Securities, Inc., Cantor Fitzgerald & Co. and Stifel, Nicolaus & Company, Incorporated (each, an “Agent,” and collectively, the “Agents”) pursuant to which the Company may issue and sell shares of its Class A common stock having an aggregate offering price of up to $75 million from time to time through the Agents.

The Company will pay each Agent, upon the sale by such Agent of Class A common stock pursuant to the Sales Agreement, an amount equal to up to 3.0% of the gross proceeds of each such sale of Class A common stock. The Company has also provided the Agents with customary indemnification rights.

The Company issued 17,104 shares of Class A common stock under the ATM Program during the nine months ended September 30, 2025 at a price of $3.52 and received net proceeds of $58.

The Company issued 36,353 shares of Class A common stock under the ATM Program during the nine months ended September 30, 2024 at prices ranging between $4.34 and $5.68 and received net proceeds of $170.

Redeemable preferred non-controlling interests

The following table summarizes the changes in the redeemable preferred non-controlling interests which represent Series A and Series A-1 preferred units outstanding at OPAL Fuels LLC (a consolidated subsidiary of the Company) from December 31, 2024 to September 30, 2025:

Redeemable non-controlling interests

At each balance sheet date, the Redeemable non-controlling interests are adjusted up to their redemption value if necessary, with an offset in stockholders' deficit. As of September 30, 2025, the Company recorded $342,528 as the redemption value based on a five-day VWAP of $2.37 per share.

9. Net Income Per Share

The following table summarizes the calculation of basic and diluted net income per share:

The basic income per share for the three and nine months ended September 30, 2025 does not include 1,635,783 shares in treasury and 716,650 shares that are issued and outstanding but are contingent on achieving earnout targets.

The following table presents the forms of antidilutive potential common shares:

10. Income taxes

For the three and nine months ended September 30, 2025, the Company recorded $14,567 and $36,290 income tax benefit, respectively, as a result of the sale to a third-party purchaser of certain transferable Investment Tax Credits that had been generated by the Company from its investments in the RNG segment. For the three and nine months ended September 30, 2024, the Company recorded $8,906 income tax benefit. The effective tax rate for the three and nine months ended September 30, 2025 and 2024 was 0%. The difference between the Company’s effective tax rate and the U.S. statutory tax rate of 21% was primarily due to a full valuation allowance recorded on the Company’s net U.S. deferred tax assets. The Company evaluates the realizability of the deferred tax assets on a quarterly basis and establishes a valuation allowance when it is more likely than not that all or a portion of a deferred tax asset may not be realized.

On July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was signed into law in the U.S. The OBBBA does not have a material effect on our condensed consolidated financial statements.

11. Stock-based compensation

The stock-based compensation expense for the above stock awards under the 2022 Plan as well as Parent Equity Awards is included in the selling, general and administrative expenses:

12. Commitments and Contingencies

Letters of Credit

As of September 30, 2025 and December 31, 2024, the Company was required to maintain standby letters of credit totaling $15,485 and $15,120, respectively, to support obligations of certain Company's subsidiaries. These letters of credit were issued in favor of a lender, utilities, a governmental agency, and an independent system operator under PPA electrical interconnection agreements, and in place of a debt service reserve. There have beenno draws to date on these letters of credit.

Lease commitments

The table below provides the total amount of lease payments on an undiscounted basis on our lease contracts as of September 30, 2025:

Guaranty

On September 13, 2024, OPAL Paragon, an equity method investment of the Company, entered into a tax credit purchase agreement with Apollo Management Holdings, L.P., ("Buyer"), pursuant to which OPAL Paragon sold $11,096 of investment tax credits to the Buyer for net proceeds of $8,906. If the tax credits are disallowed or recaptured by the government from the Buyer, OPAL Paragon will be required to return the purchase price and pay any taxes, interests or penalties incurred.

In connection with the above transaction, all of the obligations of OPAL Paragon under such tax credit purchase agreement are guaranteed by the Company.

On March 28, 2025, OPAL Paragon entered into a tax credit purchase agreement with the Buyer, pursuant to which OPAL Paragon sold $9,801 of investment tax credits to the Buyer for net proceeds of $8,037. If the tax credits are disallowed or recaptured from the Buyer, OPAL Paragon will be required to return the purchase price and pay any taxes, interests or penalties incurred.

In connection with the above transaction, all of the obligations of OPAL Paragon under such tax credit purchase agreement are guaranteed by the Company.

On June 20, 2025, OPAL Fuels LLC entered into tax credit purchase agreements with the Buyer and EagleBank, pursuant to which OPAL Fuels LLC sold $16,740 of investment tax credits for net proceeds of $13,686. If the tax credits are disallowed or recaptured from the Buyer, OPAL Fuels LLC will be required to return the purchase price and pay any taxes, interests or penalties incurred.

In connection with the above transaction, all of the obligations of OPAL Fuels LLC under such tax credit purchase agreements are guaranteed by the Company.

On September 12, 2025, OPAL Fuels LLC entered into tax credit purchase agreements with the Buyer and Athene Annuity and Life Company, pursuant to which OPAL Fuels LLC sold $17,369 of investment tax credits for net proceeds of $14,567. If the tax credits are disallowed or recaptured from the Buyer, OPAL Fuels LLC will be required to return the purchase price and pay any taxes, interests or penalties incurred.

In connection with the above transaction, all of the obligations of OPAL Fuels LLC under such tax credit purchase agreements are guaranteed by the Company.

Legal Matters

The Company is involved in various claims arising in the normal course of business. Management believes that the outcome of these claims will not have a material adverse effect on the Company's financial position, results of operations or cash flows.

Set forth below is information related to the Company’s material pending legal proceedings as of the date of this report, other than ordinary routine litigation incidental to the business. There have been no material changes to such legal proceedings from the previous quarter.

Central Valley Project

In September 2021, an indirect subsidiary of the Company, MD Digester, LLC (“MD”), entered into a fixed-price Engineering, Procurement and Construction Contract (an “EPC Contract”) with VEC Partners, Inc. d/b/a CEI Builders (“CEI”) for the design and construction of a turn-key renewable natural gas production facility using dairy cow manure as feedstock in California’s Central Valley. In December 2021, a second indirect subsidiary of the Company, VS Digester, LLC (“VS”) entered into a nearly identical EPC Contract (collectively, the "EPC Contracts") with CEI for the design and construction of a second facility, also in California’s Central Valley. CEI’s performance under both of the EPC Contracts is fully bonded by licensed sureties.

CEI submitted a series of change order requests seeking to increase the EPC Contract Price by approximately $14 million, per project, primarily due to: (1) modifications to CEI’s design drawings which are required to meet its contracted performance guaranties, and (2) a default by one of CEI’s major equipment manufacturers. The Company disputes the vast majority of the change order requests.

In January 2024, the Company filed a civil lawsuit captioned, MD Digester, LLC. et. al. vs. VEC Partners, Inc. et. al.; with the California Superior Court, County of San Joaquin; Action No. STK- CV-UCC-2024-0000185 and commenced a related arbitration proceeding in order to obtain a formal determination on the claims; AAA Case No. 01-24-0000-0775. The Superior Court Action has been stayed, pending the conclusion of the arbitration. In the meantime, the AAA has empaneled three experienced arbitrators and has set the hearing date for the matter, currently schedule in May 2026.

The EPC Agreement requires that CEI, continue working during the course of the litigation and related arbitration proceedings; however, CEI effectively stopped working. Between May and August 2024, MD issued a series of Notices of Default and Demands to Cure to CEI. CEI failed to cure, and on July 30, 2024, MD terminated CEI for default. MD notified CEI’s performance bond surety, Atlantic Specialty Insurance Company of the termination and demanded that it perform under the bond. Atlantic has denied the claim.

On July 11, 2024, VS issued a Notice of Default and Demand to Cure, advising CEI of its defaults and giving it an opportunity to cure. CEI failed to do so, and on August 27, 2024, VS terminated CEI for default. VS has notified CEI’s bond surety, also Atlantic, of the second termination and demanded that it perform under the performance bond. The surety has denied the claim.

As a result of CEI’s default and Atlantic’s denial of the claims, MD and VS have amended their claims in the AAA arbitration to include breach of contract claims against CEI and breach of performance bond and payment bond claims against Atlantic (who was formally joined into the arbitration on November 20, 2024) in the AAA Arbitration with CEI.

CEI has since recorded mechanic’s liens against each of the projects for $4,900 (MD) and $2,000 (VS), and filed actions with the Stanislaus and San Joaquin County Superior Courts, respectively, to enforce their liens. MD and VS have since recorded bonds releasing the properties from the liens and it is expected that these claims will be stayed and consolidated with the pending arbitration proceeding.

In addition to the above-referenced action and arbitration, several of CEI’s subcontractors have recorded mechanic’s liens against the MD and VS projects for $3,141, which the Company is obligated to defend and indemnify the dairy owners from and against. Several liens were untimely and have been released.

The Company believes its claims against CEI (and the surety where bond claims are denied) have substantial merit, and intends to prosecute the claims vigorously. However, due to the incipient stage of the litigation and related arbitration, the recency of the termination, and the ongoing status of the proceedings and discussions with the bond surety, as well as the uncertainties involved in all litigation and arbitration, the Company is unable at this time to assess the likely outcome of the litigation and related arbitration, the timing of its resolution, or its ultimate impact, if any, on the Central Valley projects or the Company's business, financial condition or results of operations.

Former Development Partner/Construction Manager

In March 2024, the Company filed an action in the Orange County Superior Court (Case No. 30- 2024-01415510-CU-BC-CXC) against its former development partner and construction manager, Sierra Renewable Organics Management, LLC, as well as its principal (Ethan Werner) and affiliated engineering firm (CH Four Biogas) for Breach of Contract, Indemnity, Declaratory Relief, Intentional Misrepresentation and Negligent Misrepresentation relating to the design and development of the Projects. The defendants have recently filed an answer and certain cross claims, to which the Company has demurred. Discovery in the case is now underway.

13. Subsequent Events

On October 6, 2025, the Company's Atlantic RNG facility commenced commercial operations. This project represents approximately 0.3 million MMBtu for Opal's 50% ownership share of annual design capacity.

In October 2025, the Company began construction of the CMS Concord RNG facility in North Carolina. This project represents approximately 0.7 million MMBtu for Opal's 70% ownership share of annual design capacity.

There have been no other subsequent events, that occurred during such period that would require disclosure in this Form 10-Q or would be required to be recognized in the consolidated financial statements as of and for the three and nine months ended September 30, 2025.