Montauk Renewables, a prominent U.S. renewable natural gas and electricity producer with more than 30 years of experience, reported nearly flat revenue growth in 2025 but saw operating income compress sharply due to operational challenges and increased costs. The company's future growth hinges on expanding its project portfolio and navigating risks tied to landfill gas variability and customer concentration. Capital allocation remains heavily weighted toward development capex, resulting in negative free cash flow despite positive net income.