Value15 years of guaranteed tariff payments per kWh of biomethane injected into the gas grid from new anaerobic-digestion plants; tiered tariffs reviewed annually (Annual Tariff Review); funded by the Green Gas Levy on gas suppliers
Deadlines2028-03-31 — Open to new stage 1 applications until 3/31/2028; commissioning deadline extended to 3/31/2030 (GGSS Amendment Regulations 2026, in force 10/16/2026); three-stage Ofgem registration
RequirementsNew biomethane-injection plant in Great Britain using anaerobic digestion; connect and inject to the gas grid; Ofgem stage 1 (budget allocation), stage 2 (financial close evidence) and stage 3 (registration) process; sustainability/feedstock criteria incl. waste-feedstock thresholds
CaveatsGreat Britain only; AD-based biomethane — other RNG routes (e.g. bagasse gasification) not eligible; quarterly budget caps can delay stage 1 approvals; tariff set at application and reviewed annually for new entrants; guidance v3.0 published 10/2026
Last verified2026-10-30