New York has introduced one of the most comprehensive mandatory greenhouse gas reporting regimes in the United States through 6 NYCRR Part 253. The regulation expands emissions accountability beyond facilities to include fuel suppliers, electricity importers, waste operators, and upstream contributors, supported by defined methodologies and third-party verification requirements. 

This guide provides a structured overview of New York’s Part 253 Mandatory GHG Reporting Program, helping organizations understand applicability, reporting architecture, verification expectations, and the operational steps required ahead of the 2026 emissions year.