New York Finalises Mandatory GHG Emissions Reporting for Large Emitters from 2027

New York State has finalised regulations requiring facilities emitting 10,000 metric tonnes of CO2 equivalent annually to report greenhouse gas emissions data to the Department of Environmental Conservation (DEC) starting in June 2027. The rules were finalised following more than 3,000 public comments on draft regulations published in March 2025 and come as the federal government moves to end the EPA's Greenhouse Gas Reporting Program.

Entities required to report under New York's new rules include owners and operators of electricity generation facilities, stationary combustion sources, landfills, waste-to-energy facilities, natural gas compressor stations and other infrastructure emitting 10,000 metric tonnes of CO2 equivalent per year. Fuel suppliers for natural gas, liquid fuels, petroleum products, liquefied and compressed natural gas and coal are also covered, as are waste haulers, electric power entities, agricultural lime and fertiliser suppliers, and anaerobic digestion and liquid storage waste facilities. Some large emission sources will additionally be required to verify their emissions data through DEC-accredited third-party verification services.

New York's move to mandate GHG reporting at the state level reflects a growing pattern of sub-national climate regulation in the US as federal rollbacks create gaps in emissions transparency. New York and California have both advanced mandatory climate disclosure requirements in recent months in response to the Trump administration's decisions to wind down the EPA's Greenhouse Gas Reporting Program and suspend SEC climate disclosure rule implementation. For multinational companies operating across US states, navigating a patchwork of state-level disclosure requirements will add compliance complexity even as federal requirements are reduced.

The finalised regulation extends the verification reporting deadline for the first two years and reduces reporting requirements for facilities that have closed or ceased operations, incorporating feedback from the public comment period. Commissioner Lefton said the reporting rule will enable DEC to develop effective strategies to reduce harmful air pollution and direct investment where it is most needed, despite proposed federal rollbacks. Annual reporting will cover the previous year's emissions, meaning the first reports filed in June 2027 will reflect 2026 data. The new rules will support New York State's broader efforts to meet its GHG emissions reduction goals under state climate law.

Key figure — 10,000 metric tonnes CO2e annual reporting threshold