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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2025
Subsequent Events [Abstract]
Subsequent Events	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.