MNTK · Montauk Renewables, Inc.

Montauk Renewables’ Q1 2026 results reflect a structural shift in revenue composition: while RNG commodity revenue fell nearly 49.3% year-over-year due to the expiration of fixed/floor-price pathway contracts, environmental attribute revenue surged—driven entirely by RINs distributed from the GreenWave joint venture, which contributed no RIN-related revenue in Q1 2025. This dynamic lifted total revenue 9.0% to $46.4 million and propelled Non-GAAP Adjusted EBITDA up 22.8% to $10.8 million. However, GAAP operating performance deteriorated, with operating loss widening to $1.6 million (from $0.4 million operating income in Q1 2025), underscoring margin pressure from rising O&M expenses—including a 33.8% increase in Renewable Electricity Generation O&M costs tied to the Montauk Ag Renewables project ramp-up and Bowerman facility maintenance timing. Net income turned marginally positive ($5 thousand) solely due to $3.3 million in equity method income from GreenWave, masking underlying operational weakness. Operationally, RNG production held flat at 1.4 million MMBtu, but output shifts occurred across facilities: Atascocita and Apex increased production following system enhancements and second-facility commissioning, while Galveston and McCarty declined due to host-operator transitions and wellfield bifurcation. The March 2026 $200 million senior credit facility with HASI provides financial flexibility and replaces prior debt, with $45 million undrawn as of the filing. Full-year guidance reaffirms RNG volume and revenue targets but lowers REG revenue expectations, explicitly attributing the revision to delayed revenue generation at the newly commissioned Montauk Ag Renewables project in North Carolina—expected to commence in May 2026 with gradual ramp-up through the year. Management’s commentary emphasizes feedstock collection expansion and long-term offtake security, including the five-year gas rights extension at Raeger through 2031 and EPA’s finalized 2026–2027 RFS standards, which raise cellulosic biofuel volume requirements and support RIN pricing stability.