New York State has finalized a major regulatory mandate establishing a statewide greenhouse gas (GHG) disclosure regime for large emissions sources, positioning the state as a leader in subnational climate transparency in the United States.

Under rules adopted by the New York State Department of Environmental Conservation (DEC), facilities that emit 10,000 metric tons of carbon dioxide equivalent (CO2e) or more annually—across sectors including power generation, fuel supply, waste management, and industrial operations—will be required to collect and submit detailed GHG emissions data beginning in June 2027, reflecting emissions from the 2026 calendar year.

The program establishes annual reporting obligations and, for certain large sources, third-party verification conducted by DEC-accredited verification bodies. The disclosed emissions data will support New York’s broader climate and energy policy objectives, improve emissions transparency, and inform investment targeting and compliance strategies under the state’s Climate Leadership and Community Protection Act.

State regulators highlight that the mandatory reporting rule fills an emissions data gap at the state level, particularly as federal climate disclosure initiatives face uncertainty, and lays the groundwork for future climate action planning and accountability. Critics, however, note that reporting alone does not yet impose emissions limits or pricing mechanisms.