How Lower RIN Prices Weighed on Montauk Renewables’ 2025 Profitability

Montauk Renewables (NASDAQ:MNTK) is one of the best renewable energy penny stocks to buy. On March 11, 2026, Montauk Renewables reported full-year 2025 results showing revenue of $176.4 million, essentially flat from $175.7 million in 2024, as a 29.0% drop in average realized RIN pricing to $2.33 offset the stronger natural gas index pricing, which rose 51.1%, and higher RIN volumes sold. The company sold 44.1 million RINs in 2025, up 20.5% year over year, while RNG production increased 1.0% to 5.6 millio ...