Mandatory Greenhouse Gas Reporting

Collecting data from greenhouse gas (GHG) emissions sources statewide is critical to ensuring New York State has the most current, accurate, and reliable information available.  This information will support: 

• the development of strategies to reduce harmful GHG emissions and
• directing clean energy investments where they are needed most. 

Investments in clean energy and GHG emission reduction measures support healthy air quality for New Yorkers while mitigating the negative effects of climate change in the State. As part of New York’s ongoing efforts to gather information regarding sources of GHG emissions and implementation of the Climate Leadership and Community Protection Act (Climate Act), the New York State Department of Environmental Conservation (DEC) has proposed the Mandatory Greenhouse Gas Reporting Program (Reporting Program or Part 253) as recommended by the Climate Action Council’s Scoping Plan. The Reporting Program would require certain sources of GHG emissions, i.e., Reporting Entities, to annually report emissions and related data to DEC.  By collecting critical emissions information, the Reporting Program would inform potential future actions to implement the Climate Act.

View the proposed Mandatory Greenhouse Gas Emissions Reporting Regulation here.

NYS Electronic Greenhouse Gas Emissions Reporting Tool (NYS e-GGRT)

As proposed, Part 253 would require Reporting Entities to report emissions via the New York State Greenhouse Gas Reporting Tool (NYS e-GGRT) annually. The NYS e-GGRT electronic reporting platform is currently being developed. This tool will be designed to simplify reporting by Reporting Entities to DEC. DEC will provide NYS e-GGRT training once the system is in place.

Last Updated: 4/30/25 

Note: the estimator tool has been updated from the previous version and the details of all updates are documented within the tool. 

As proposed, Part 253 would require certain entities to report: Who Should Report?  

*Note: CO2e calculations use a 20-year global warming potential (20GWP). 20GWP is an assessment of the Global Warming Potential of GHGs over an integrated 20-year time frame.

General Regulation Information 

The proposed Mandatory Greenhouse Gas Reporting regulation, Part 253, is available on the Department’s recently proposed regulations webpage, Proposed, Emergency, and Recently Adopted Regulations. 

• Text of Proposed Part 253 (PDF)
• Text of Proposed Part 253 Summary (PDF)
• Text of Proposed Part 200 (PDF)
• Regulatory Impact Statement (PDF)
• Rural Area Flexibility Analysis (PDF)
• Regulatory Flexibility Analysis for Small Businesses and Local Governments (PDF)
• Job Impact Statement (PDF) 

The proposed Part 253 regulation contains Key Dates including: 

*Note: Emission data reports and verification statements for the 2026 emissions data year would be due in 2027.

FAQ and Fact Sheet

Informational Webinar

Webinar Recording 

Webinar PPT (PDF)  

On May 15, 2025, the Department presented two identical informational webinars on the proposed Mandatory Greenhouse Gas Reporting (Part 253) regulation. The purpose of these webinars was to better inform stakeholders’ public comments on the proposal by answering clarifying questions. While the Department accepted clarifying questions in anticipation of the webinars, these webinars were solely for informational purposes and did not constitute a public hearing pursuant to the State Administrative Procedures Act. For those who were unable to attend, please see a video of the webinar recording at the link above.

Public Hearings 

DEC hosted 2 virtual public comment hearings, and 3 in-person public comment hearings from June 3, 2025, to June 18, 2025. To view the full Notice of Public Comment visit Proposed Rulemakings.

As proposed, Part 253 would require verification

Verification Resources 

Verification would identify discrepancies in emissions or product data to ensure that the data submitted is accurate. 

Third-party verification would be required annually for large emission sources that meet the listed thresholds.

If an emission source meets the threshold for verification, the responsible Reporting Entity would be required to contract with a verification body accredited by the DEC. Verification statements would be required to be submitted to DEC by August 10th of each year for the previous year’s emissions data report. Verification would occur on a three-year schedule, with full verification occurring the first year and less-intensive verification occurring the following two years. Full verification involves a site visit and closer inspection of the data. Less intensive, interim verification does not require a site visit and would only be permitted if a positive verification statement has been received in the first year of the three-year verification period. 

The Department is currently developing a Verification Bodies webpage. Verification Bodies will be able to visit the page for additional requirements.