OPAL Fuels Inc.

Construction Update

•The Atlantic RNG project remains on schedule to commence commercial operations in thethird quarter of 2025. This project represents approximately 0.3 million MMBtu for OPAL Fuels’ 50% ownership share of annual design capacity.4,5

•The Burlington and Cottonwood RNG projects, representing an aggregate annual design capacity of 1.1 million MMBtu for OPAL's share, are expected to commence commercial operations in 2026.

1 This is a non-GAAP financial measure. A reconciliation of this non-GAAP financial measure to its comparable GAAP financial measure has been provided in the financial tables included in this press release. An explanation of this measure and how it is calculated is also included below under the heading “Non-GAAP Financial Measures."

2 The Company updated its policy in Q3’24 to include virtual pipeline costs as an add-back to Adjusted EBITDA. As a result, the impact for Q2’24 was also updated to reflect this change and ensure consistency across periods.

3 Represents OPAL Fuels' proportional share with respect to RNG projects owned with joint venture partners. Includes Sunoma and Biotown

4 Design capacity is the annual design output for each facility and may not reflect actual production from the projects, which depends on many variables including, but not limited to, quantity and quality of the biogas, operational up-time of the facility, and actual productivity of the facility.

5 Represents OPAL Fuels' proportional share with respect to RNG projects owned with joint venture partners.

•The Kirby RNG project located in California, representing an aggregate annual design capacity of 0.7 million MMBtu for OPAL's 100% ownership, is expected to commence commercial operations in 2027..

•Completion of construction at two dairy projects in California (Hilltop and Vander Schaaf) continues to be delayed due to a dispute with the prior Engineering, Procurement and Construction contractor over a series of change order requests.6

•At June 30, 2025, we had 46 fueling stations under construction including 20 owned by OPAL.