The Environment Agency (EA) has published the outcome of its September 2025 consultation on changes to standard rules permits for medium combustion plant and specified generators. The EA has decided to: (1) correct the NOₓ limit for specified generators operating under 500 hours so that it remains at 190mg/Nm³; (2) amend the wording of SR2018 No 3 to allow abatement compliance without fixed timescales; (3) withdraw SR2018 Nos 2, 3, 5, 6, 8 and 9 for new applicants from 28 February 2026, with existing holders transitioning to simple bespoke permits free of charge; (4) add hydrogen and gas oil substitutes, such as hydrotreated vegetable oil, to the relevant standard rules permits and (5) relax restrictions on stack configurations for low-use generators. The EA intends to implement the amendments within six months and to conduct further consultations on hydrogen production and mobile medium combustion plants.