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 million MMBtu when adjusted for the prior-year sale of an RNG facility.
Profitability weakened. Net income fell 82.0% to $1.7 million, operating income dropped 94.7% to $0.9 million, and adjusted EBITDA declined 16.5% to $35.6 million. Management attributed the pressure mainly to higher operating and maintenance costs at RNG facilities, including increased utility expense, preventative maintenance, wellfield operational enhancement programs, media change-outs, and disposal costs at Apex, Atascocita, Rumpke, and Raeger. Renewable electricity operating and maintenance expense also rose, driven mainly by non-capitalizable costs at the Montauk Ag Renewables project.
For 2026, Montauk expects RNG revenue of $175 million to $190 million on production of 5.8 million to 6.1 million MMBtu. It also guided for renewable electricity revenue of $35 million to $41 million and production of 195 thousand to 207 thousand MWh, with the increase tied to the anticipated commercial operation of the Montauk Ag Renewables project in North Carolina.
Montauk Renewables, Inc. (NASDAQ:MNTK) is a renewable energy company focused on recovering biogas and converting it into renewable natural gas and renewable electricity. Headquartered in Pittsburgh, the company operates landfill methane-fueled projects across multiple U.S. states.
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