OPAL Fuels Inc.

Rule 10b5-1 Trading Plans

During the fiscal quarter ended June 30, 2025, none of the Company’s directors or executive officers adopted orterminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement.”

New RNG Joint Venture

On May 9, 2025, a wholly-owned indirect subsidiary of the Company, entered into a limited liability company agreement (the “LLC Agreement”) with a leading environmental solutions company (the "Counterparty"), establishing the terms and conditions of governance and operation of a joint venture (the “Joint Venture”). The purpose of the Joint Venture, 70% of which is owned indirectly by the Company and 30% of which is owned by the Counterparty (together, the "Shares"), is to develop, construct, own and operate a facility (the “RNG Facility”) to produce RNG using biogas generated by a certain landfill.

The LLC Agreement governs the terms and conditions of capital contributions to be made by the Joint Venture members to fund the development, construction and operations of the RNG Facility. The LLC Agreement requires members of the Joint Venture to contribute their respective Shares of such capital requirements. The LLC Agreement contemplates that the RNG Facility will be located on a landfill owned by an affiliate of the Counterparty, with a nameplate capacity designed for approximately 5,500 scfm of landfill gas. The representations, warranties and covenants contained in the LLC Agreement were made solely for the benefit of the parties to the LLC Agreement and may be subject to limitations agreed upon by the contracting parties.

The LLC Agreement also provides for the Joint Venture to enter into an agreement with an affiliate of the Counterparty for the contractual rights to purchase landfill gas for the purpose of producing RNG at the RNG Facility (the “RNG Gas Rights Agreement”), as well as the site lease for the RNG Facility (the “RNG Site Lease”). The RNG Gas Rights Agreement and RNG Site Lease expire twenty (20) years from the date of commencement of operations of the RNG Facility. The existing gas rights agreement between an indirect subsidiary of the Company and an affiliate of the Counterparty (which relate to renewable electricity facilities) will terminate in accordance with the provisions of the RNG Gas Rights Agreement.

Further, the LLC Agreement contemplates that the Joint Venture will enter into a management services agreement (the “MSA”), an operations and maintenance agreement (the “O&M Agreement”), and an RNG marketing agreement (the "RNG Marketing Agreement") with certain wholly-owned, indirect subsidiaries of the Company. The MSA will establish terms and conditions for the day-to-day administration of the projects, including responsibility for managing the development and overseeing the construction of the RNG Facility. The O&M Agreement will establish the terms and conditions for operating and maintaining the RNG Facility once construction is completed. The RNG Marketing Agreement will provide for the acquisition, marketing and sale of the environmental attributes associated with RNG produced by the RNG Facility. The definitive terms and conditions of these agreements are not yet established and, accordingly, there is no guarantee that the Joint Venture will enter into each of these agreements.

This summary of the terms of the LLC Agreement does not purport to be complete and is qualified in its entirety by reference to the text of the LLC Agreement, a copy of which is filed as Exhibit 10.1 hereto.