NY Part 253 GHG Reporting Compliance Support

The New York State Mandatory Greenhouse Gas Reporting Program (6 NYCRR Part 253) is a mandatory greenhouse gas (GHG) reporting regulation that requires certain entities operating in New York to annually report GHG emissions to the New York State Department of Environmental Conservation (NYSDEC). The rule supports implementation of the Climate Leadership and Community Protection Act (CLCPA) and applies beginning with calendar year 2026 emissions. The first annual emissions data report is due June 1, 2027.

NYSDEC is currently exercising enforcement discretion on several near-term deadlines while it amends Part 253; the regulatory deadlines themselves are unchanged. See the current deadlines and what’s changing in our latest client alert.

Key details of the program include:

  • Applicability: Facilities located in New York that emit 10,000 metric tons or more of CO₂e per year; fuel suppliers delivering natural gas, liquid fuels, petroleum products, LNG, CNG, or coal for use in New York; certain waste transporters exporting solid waste generated in New York; electric power entities; and specified agricultural and waste management operations.

  • Reporting Requirements: Reporting entities must submit annual emissions data calculated in accordance with NYDEC-prescribed methodologies and expressed in CO₂e. As currently written, Part 253 uses 20-year global warming potentials (GWP20). The May 26, 2026 CLCPA amendments moved New York to a 100-year basis, and NYSDEC is amending Part 253 to match. Methane-heavy sources may fall below the reporting or verification thresholds on a 100-year basis, so we recommend calculating CO₂e on both bases until the revised rule is final.

  • Reporting Platform and Monitoring Plans: Reports will be submitted electronically through NYS e-GGRT, the NYSDEC reporting platform now in development. Large Emission Sources must prepare a GHG monitoring plan, and certain waste facilities must submit an Emissions Monitoring and Measurement Plan (EMMP). All reporters must retain supporting documentation as required by Part 253.

  • Large Emission Sources: Facilities emitting 25,000 metric tons of CO₂e or more per year, and suppliers exceeding defined fuel thresholds, must obtain annual third-party verification from a NYDEC-accredited verifier.

  • Penalties: Failure to report, submit incomplete or inaccurate data, or maintain required records may result in enforcement action and civil penalties. NYSDEC is currently exercising enforcement discretion only for specific near-term deadlines; all other requirements remain enforceable.

The first reports will cover 2026 emissions, and that emissions year is nearly over. NYSDEC’s enforcement discretion delays when certain submissions are due, not when data must be captured. If your company may be subject to Part 253, confirm applicability now and make sure your 2026 activity data is complete.

Recommended Reading

Newsroom
NY Part 253 Update: Enforcement Dates, the 100-Year GWP Shift, and Next Steps
NY Part 253 Update: Enforcement Dates, the 100-Year GWP Shift, and Next Steps

NYSDEC delayed enforcement on six Part 253 deadlines, but 2026 data is still required, and methane-heavy sources may need to re-screen reporting thresholds.

Read more →
Articles
New York Finalizes Mandatory GHG Reporting Rule: Who Must Report and What’s Due in 2026–2027
New York Finalizes Mandatory GHG Reporting Rule: Who Must Report and What’s Due in 2026–2027

New York’s Part 253 Mandatory GHG Reporting Program is now in effect, marking a major implementation step under the Climate Act. The rule establishes statewide emissions reporting and annual verification requirements for Large Emission Sources. Learn who must report, verification thresholds, key deadlines, and what companies should do now to prepare for Part 253 compliance.

Read more →

Expert GHG Reporting & Third-Party Verification for Large Emitters

KERAMIDA helps companies comply with New York’s Part 253 regulation through two separate service pathways: reporting support and independent assurance. Our reporting and planning services include developing data collection strategies, preparing GHG inventories aligned with Part 253 methodologies, and assisting companies in developing and documenting monitoring methodologies, EMMPs, internal controls, and quality assurance procedures.

Our assurance services support Large Emission Sources that must meet Part 253’s verification requirements. To uphold the highest ethical standards and prevent any conflict of interest, KERAMIDA does not both prepare and verify the same GHG inventory.

Our NY Part 253 Compliance Services include:

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Why Partner with KERAMIDA?

  • KERAMIDA staff have extensive experience supporting facilities subject to the U.S. EPA Mandatory Reporting Rule (40 CFR Part 98), including the development of monitoring plans, emissions calculations, data management systems, and annual electronic reporting. Our team understands subpart applicability determinations, combustion calculation methodologies, emission factor selection, missing data procedures, and QA/QC documentation requirements. This experience directly supports compliance with 6 NYCRR Part 253, as many of the technical calculation frameworks and monitoring expectations are aligned with federal reporting standards. By leveraging our EPA MRR expertise, we help organizations establish defensible, regulator-ready reporting systems that ensure accuracy, transparency, and consistency across state and federal programs.

  • We design GHG monitoring plans, internal controls, and QA/QC procedures with verification in mind from the outset. KERAMIDA’s experience supporting third-party assurance engagements ensures that emissions calculations, data collection processes, and documentation controls are audit-ready and defensible. By embedding assurance-aligned practices into compliance programs, we help organizations reduce risk, streamline verification, and maintain regulatory credibility under Part 253.

  • Our extensive experience with California’s climate regulations provides valuable perspective on complex emissions reporting programs, allowance-based systems, combustion calibration requirements, and evolving compliance frameworks. Having supported clients through CARB-aligned reporting and assurance processes, KERAMIDA understands the level of precision, documentation, and system integration regulators expect. This insight translates directly to helping organizations proactively and effectively comply with New York’s Part 253 requirements.

  • KERAMIDA is a California Air Resources Board (CARB)-accredited GHG verification body, operating within one of the most established regulatory verification frameworks in the United States. Maintaining this accreditation requires a mature quality management system, clearly defined independence and conflict-of-interest safeguards, documented verifier competencies, and structured technical review procedures. This experience reflects our ability to function effectively within regulator-driven assurance programs and demonstrates a strong foundation for supporting and aligning with evolving assurance accreditation requirements under 6 NYCRR Part 253.

  • KERAMIDA’s sustainability team is composed of seasoned environmental professionals with decades of combined experience in air quality permitting, emissions reporting, GHG inventory development, and regulatory compliance across multiple sectors. Our multidisciplinary background allows us to understand industry-specific operational realities while translating complex regulatory requirements, such as those under 6 NYCRR Part 253, into practical, implementable solutions. By combining technical depth with hands-on industry knowledge, we help organizations build efficient, compliant, and strategically aligned emissions management programs that withstand regulatory scrutiny and support long-term sustainability goals.

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