California Air Resources Board

Public Meeting in Sacramento from 9:00 a.m. to 12:00 p.m. to Discuss Compressed Natural Gas (CNG) Fuel Specifications.

• Meeting Notice and Agenda
  • Revised Agenda
• CARB Staff Presentation: color; black and white
• Stakeholder Presentations
  • Southern California Gas Company
  • San Diego Air Pollution Control District: color; black and white
• Research Studies
  • SoCalGas/SDG&E Vehicle Report (this link not found)
  • SwRI Heavy Duty Study (this link not found)
  • Sierra Research HD Analysis (this link not found)
  • SwRI Light Duty Study (this link not found)
  • Sierra Research LD Analysis (this link not found)
• Comment Letters
  • Sempra Energy Utilities
    • Proposed Specifications for Alternative Motor Vehicle Fuels
    • American Honda Motor Company, Inc. Letter
  • Sempra LNG
  • South Coast Air Quality Management District
  • Engine Manufacturers Association
  • Kings Canyon Unified School District
  • St. Croix Research
  • Clean Energy
  • San Diego County Air Pollution Air District 
    • Cover Letter
    • Comments
  • Revolution CNG
  • Central Coast Clean Cities Coalition
  • General Motors

Public Consultation Meeting in Sacramento from 10:00 a.m. to 3:00 p.m. to Discuss a Draft Proposed Concept to Revise the Motor Vehicle CNG Specifications.

• Meeting Notice and Agenda
• Draft CNG Specifications Proposal
• ARB Staff Presentation (PPT) or (PDF)
• Research Needs:
  • Aspen Environmental Group: Natural Gas Heat Content Surge by William Walters (PPT) or (PDF)
  • California Energy Commission: Public Interest Natural Gas Air Quality Research Program by Marla Mueller (PPT) or (PDF)
• Industry Presentations:
  • Bevilacqua-Knight, Inc.: Comments On The Proposed CARB Alternative Fuel Specifications by Steven Sokolsky (PPT) or (PDF)
  • California Natural Gas Vehicle Coalition: NGV Commercial Fuel Spec by Mike Eaves (PPT) or (PDF)
  • Engine Manufacturers Association: Presentation at the CARB Workshop by Roger Gault (PPT) or (PDF)
  • Gas Technology Institute: Natural Gas Composition for NGVs by William E. Liss (PPT) or (PDF)
  • Pacific Gas and Electric Company: Comments to the CARB Draft Proposed Concept – CNG Motor Vehicle Specifications by Tony Estrada (PPT) or (PDF)
  • Shell North America LPG: Presentation at the CARB Workshop by Edgar Kuipers (PPT) or (PDF)
  • SoCal Gas: Comments on the CARB Draft Proposed Concept to Revise Motor Vehicle CNG Specifications by Edwin Harte (PPT) or (PDF)
  • Southwest Research Institute: Study on the Effect of Varying Fuel Composition on Fuel Supplied to Cummins and Detroit Diesel Gas Engines by James Chiu (PPT) or (PDF)
  • Western States Petroleum Association and California Independence Petroleum Association: Presentation at the CARB Workshop by Tom Umenhofer (PPT) or (PDF)
• Comment Letters:
  • Santa Barbara County Air Pollution Control District by Terry Dressler
  • County of San Luis Obispo Air Pollution Control District by Larry R. Allen

Change of Date: Natural Gas Quality Workshop Notice

The California Energy Commission and the California Public Utilities Commission will conduct a joint workshop to address natural gas quality issues on February 17 and 18, 2005 in San Francisco, CA.

• Notice of Change of Workshop Date

Natural Gas Quality Workshop Notice   

The California Energy Commission and the California Public Utilities Commission will conduct a joint workshop to address natural gas quality issues on December 8 and 9, 2004 in San Francisco, California.

The workshop is being conducted in collaboration with the California Air Resources Board and the California Department of Conservation’s Division of Oil, Gas, and Geothermal Resources.

• Workshop Notice and Agenda

Notice of Cancellation

The Hearing for consideration of amendments to the California Alternative Fuels for Motor Vehicle Regulations has been cancelled. A new notice will be published at least 45 days in advance of the public hearing.   

This notice can be accessed from our website.

Notice of Change Location

The Meeting Location for Public Hearing scheduled on May 16, 2002 for considering the adoption of Proposed Amendments to the Compressed Natural Gas and Liquefied Petroleum Gas Specifications in the California Alternative Fuels for Motor Vehicle Regulations has been changed.    

For more information please go to the formal rulemaking area.

Notice of Postponement

The Public Hearing scheduled on February 21, 2002 for considering the adoption of: Proposed Amendments to the Compressed Natural Gas and Liquefied Petroleum Gas Specifications in the California Alternative Fuels for Motor Vehicle Regulations has been postponed.    

For more information please go to the formal rulemaking area.

Public Meeting Notice and Agenda to Discuss Proposed Amendments CNG and LPG Motor Vehicle   
Fuel Specifications

• CNG Presentation (PPT) (PDF)
• CNG Attendee List
• LPG Presentation (PPT) (PDF)
• LPG Attendee List

Public meeting notice and agenda to discuss CNG motor vehicle fuel quality. 

• CARB Presentation
• CARB Strawman Proposal
• CARB Public Meeting Attendance List
• Kings Canyon Unified School District Fleet Presentation
• Kings Canyon - Fleet Attachment
• Engine Manufacturers Association Presentation
• Southern California Gas Presentation
• Membrane Technology and Research Presentation

Workshop notice and agenda to discuss the need to amend the alternative fuels regulations for LPG or CNG, and draft concepts.

• CARB Staff Presentation
• EMA Presentation
• SoCal Gas Presentation
• Mendocino AQMD Presentation
• Antek Presentation
• CAVTEC Presentation

Workshop Notice for October 29, 1998 Re: Evaluation of the Motor Vehicle Fuel Specifications for Compressed Natural Gas

CARB Gives First Time Approval to Compressed Natural Gas Truck Parts   
CARB Certifies State's First Compressed Natural Gas Bus   
CARB Demonstrates First Natural Gas Powered "Clean Air" School Bus

Monday, March 23, 2026

1:00 PM - 4:00 PM

The California Air Resources Board (CARB) will hold a virtual public workshop to support the development of the California Corporate Greenhouse Gas Reporting Program authorized by Senate Bill (SB) 253 (Wiener, Stats. 2023; codified in Health & Safety Code (HSC) § 38532), as amended by SB 219 (Wiener, Stats. 2024, Chapter 766; codified in HSC §§ 38532 and 38533). 

The workshop will include an update from CARB staff on additional information for the August 10, 2026, Scope 1 and Scope 2 emissions reporting deadline. The workshop will also cover the next stage in regulatory development and provide an overview of the development of the greenhouse gas reporting requirements for 2027-2030 under HSC § 38532. Discussion will include preliminary staff options for Scope 3 emissions reporting requirements for 2027-2030, a solicitation of alternative approaches, and an overview of staff’s approach to the economic analysis.

Workshop Recording (posted 3/25/26)

Public Notice

CARB Presentation Slides (posted 3/20/26)

Submit Public Comment*

*It would be most helpful to get cost-related comments by April 13. Informal comments will be received until June 1.

Submitted Public Comments

Tuesday, November 18, 2025

9:30 AM - 12:30 PM

The California Air Resources Board (CARB) will hold a virtual public workshop to support the development of the California Corporate Greenhouse Gas Reporting Program and the Climate-Related Financial Risk Disclosure Program, authorized by Senate Bills (SB) 253 (Wiener, 2023) and SB 261 (Stern, 2023), as amended by SB 219 (Wiener, 2024; amending Health & Safety Code (HSC) §§ 38532 and 38533).

The workshop will begin with an update from CARB staff on the development of the programs under HSC §§ 38532 and 38533. Discussion will include the preliminary list of covered/reporting entities published on September 24, 2025, and efforts to refine this list to inform development of the initial regulation. To further inform compliance and help determine which entities are subject to each statute, staff will also present proposed updates to definitions and exemptions. In addition, staff will discuss the scope of the initial regulation, which is limited to establishing the fee component and associated definitions, and the first reporting deadline for HSC § 38532.

Workshop Recording (posted 11/25/25)

Public Notice

CARB Presentation Slides (updated on 11/21/25)

Thursday, August 21, 2025

9:30 AM - 12:30 PM

The California Air Resources Board will hold a virtual public workshop where staff will present a draft framework for a fee regulation, as authorized by Health and Safety Code § 38532 and 38533. The workshop will also draft definitions needed for determining covered entities, such as “revenue”, “doing business in California”, and “parent-subsidiary” relationships. These definitions are relevant to implementing the statutes, which require first reports due in 2026, as they will inform which companies will be subject to reporting. Staff will also provide updates on the regulatory development timeline, considerations for assurance requirements under the California Corporate Greenhouse Gas Reporting Program, take input on proposed minimum reporting requirements related to Health & Safety Code § 38533, and discuss phasing in details for Scope 3 emissions in relation to the largest sectors of emissions.  Staff will take verbal feedback during the workshop and will open a public docket for written comments to remain open for three weeks following the workshop.

Workshop Recording (posted 8/22/25)

Public Notice

CARB Presentation Slides (posted (8/20/25)

Submitted Public Comments

The California Air Resources Board held a virtual public workshop to support the development of California’s Corporate Greenhouse Gas Reporting Program, established by Senate Bill (SB) 253 (Wiener, 2023), and the Climate-Related Financial Risk Disclosure Program, authorized by SB 261 (Stern, 2023). SB 219 (Wiener, 2024) amended both programs, extending certain deadlines and implementing other administrative changes. The workshop included an overview of the above-mentioned legislation, a timeline for regulatory development, and an overview of feedback received from stakeholders from our December 2024 California Climate-Disclosure Information Solicitation. Additional presentations will include a comparative analysis of greenhouse gas accounting and reporting mechanisms that currently exist across various regulatory and voluntary programs.

Workshop Recording (posted 6/2/25)

Public Notice

CARB Presentation Slides (posted 5/28/25)

Montrose Environmental Presentation Slides (posted 5/28/25)

UCLA Presentation Slides (posted 5/29/25)

Reporting Forms and Calculation Workbooks

This page provides information for using Reporting Forms and Calculation Workbooks when reporting GHG emissions data as well as other required information in Cal e-GGRT. For each applicable subpart from the list below, and depending on the type of data being reported, users may be required to submit supplemental data and information using Excel-based Reporting Forms and Calculation Workbooks. 

The "via XML" label below indicates the document must be exported in XML format before uploading the workbook. The "supports calculation" label below indicates the workbook can be used to perform the calculation used to estimate emissions. All other Excel documents must be uploaded into Cal e-GGRT.

Please note: XML functionality is not supported in the web browser version of Microsoft Excel (Office 365).  If you upload a workbook to Office 365 (or your browser automatically opens it) and you see a message saying the file contains unsupported features, please use the Excel desktop application to open and use the workbook instead.

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Reporting Forms

(To input data, click the appropriate link, enter data, then upload to Cal e-GGRT if required )

Subpart EPE - Electric Power Entities

ONE - EPE Importers and Exporters

Subpart A - Forest Product

Forest Product.xls

Subpart A - Missing Data Substitution Reporting Form

Missing Data Substitution Reporting Form.xlsx

Subpart C - Stationary Combustion

Equation C-2b (HHV) Calculation Spreadsheet.xls

Equation C-2b (CC) Calculation Spreadsheet.xls

Equation C-2b (CC and MW) Calculation Spreadsheet.xls

Subpart N - Glass Production

Equation N-1 Calculation Spreadsheet.xls

Subpart P - Hydrogen Production

Equation P-1 Calculation Spreadsheet.xls (via XML)

Equation P-2 Calculation Spreadsheet.xls (via XML)

Equation P-3 Calculation Spreadsheet.xls (via XML)

Subpart R - Lead Production

Subpart R Reporting Form.xls

Subpart S - Lime Manufacturing

Subpart S Equation Calculation Spreadsheet.xls

Subpart V - Nitric Acid Production

Subpart V GHG Reporting Form - Required Data.xls

Equation V-2 Calculation Spreadsheet.xls

Equation V-3c Calculation Spreadsheet.xls

Subpart W - Petroleum and Natural Gas Systems (Subarticle 5)

Petroleum and Natural Gas Systems - Emissions Reporting Workbook.xlsm (via XML)

Petroleum and Natural Gas Systems - Activity Data Workbook.xlsx

Subpart Y - Petroleum Refineries (production data)

Subpart Y Additional Production Data.xlsm (via XML)

Complexity Weighted Barrel (CWB) Reporting Form.xlsx (via XML)

Subpart Y - Petroleum Refineries (emissions data)

Equation Y-1a Calculation Spreadsheet.xls (supports calculation)

Equation Y-1b Calculation Spreadsheet.xls (supports calculation)

Equation Y-2 Calculation Spreadsheet.xls (supports calculation)

Equation Y-4, Y-5 Calculation Spreadsheet.xls (via XML)

Equation Y-6, Y-7a, Y-7b Calculation Spreadsheet.xls (supports calculation)

Equation Y-9, Y-10 Calculation Spreadsheet.xls (via XML)

Equation Y-11 Calculation Spreadsheet.xls (supports calculation)

Equation Y-12 Calculation Spreadsheet.xls (via XML)

Equation Y-13 Calculation Spreadsheet.xls (via XML)

Equation Y-14, Y-15 Calculation Spreadsheet.xls (via XML)

Equation Y-16a, Y-16b, Y-17 Calculation Spreadsheet.xls (via XML)

Equation Y-18 Calculation Spreadsheet.xls (via XML)

Equation Y-19 Calculation Spreadsheet.xls (supports calculation)

Equation Y-21 Calculation Spreadsheet.xls (via XML)

Equation Y-22 Calculation Spreadsheet.xls (via XML)

Equation Y-23 Calculation Spreadsheet.xls (via XML)

Equation Y-SSM Calculation Spreadsheet.xls (via XML)

Subpart MM - Suppliers of Transportation Fuels Calculation and Reporting Tool

Suppliers of Transportation Fuels Calculation and Reporting Tool.xls

Subpart NN - Suppliers of Natural Gas and NGLs

Subpart NN Natural Gas Received by End Users.xls

Subpart NN Natural Gas Deliveries to Pipelines and LDCs.xls

Subpart NN - Interstate NG Pipeline.xls

Subpart NN - LNG Received by End-Users.xls