Organization and Description of Business	12 Months Ended
Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	1. ORGANIZATION AND DESCRIPTION OF BUSINESS OPAL Fuels Inc. (including its subsidiaries, the “Company”, “OPAL,” “we,” “us” or “our”) is a renewable energy company specializing in the capture and conversion of biogas for the (i) production of Renewable Natural Gas (“RNG”) for use as a vehicle fuel for heavy and medium-duty trucking fleets, (ii) generation of electricity from renewable sources ("Renewable Power") for sale to utilities, (iii) generation and sale of Environmental Attributes associated with RNG and Renewable Power, and (iv) sales of RNG as pipeline quality natural gas. The term “Environmental Attributes” refers to federal, state and local government incentives in the United States, provided in the form of Renewable Identification Numbers “RINs”, Renewable Energy Credits “RECs”, Low Carbon Fuel Standard credits “LCFS”, rebates, tax credits and other incentives to end users, distributors, system integrators and manufacturers of renewable energy projects. OPAL also designs, develops, constructs, operates and services Fueling Stations for trucking fleets across the country that use natural gas to displace diesel as their transportation fuel. The biogas conversion projects currently use landfill gas and dairy manure as the source of the biogas. In addition, we are pursuing opportunities to diversify our sources of biogas to other waste streams. The Company has three operating segments: 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

Organization and Description of Business

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Description of Business

1. ORGANIZATION AND DESCRIPTION OF BUSINESS

OPAL Fuels Inc. (including its subsidiaries, the “Company”, “OPAL,” “we,” “us” or “our”) is a renewable energy company specializing in the capture and conversion of biogas for the (i) production of Renewable Natural Gas (“RNG”) for use as a vehicle fuel for heavy and medium-duty trucking fleets, (ii) generation of electricity from renewable sources ("Renewable Power") for sale to utilities, (iii) generation and sale of Environmental Attributes associated with RNG and Renewable Power, and (iv) sales of RNG as pipeline quality natural gas. The term “Environmental Attributes” refers to federal, state and local government incentives in the United States, provided in the form of Renewable Identification Numbers “RINs”, Renewable Energy Credits “RECs”, Low Carbon Fuel Standard credits “LCFS”, rebates, tax credits and other incentives to end users, distributors, system integrators and manufacturers of renewable energy projects. OPAL also designs, develops, constructs, operates and services Fueling Stations for trucking fleets across the country that use natural gas to displace diesel as their transportation fuel. The biogas conversion projects currently use landfill gas and dairy manure as the source of the biogas. In addition, we are pursuing opportunities to diversify our sources of biogas to other waste streams.

The Company has three operating segments: 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