Greenhouse gas reporting


On this page: Overview | Greenhouse gas reporting web portal and reporting form | Electric utility supplemental data reporting | Resources | Contact us

Please note: If you would like to request a Spanish interpretation, please email cdphe_apcd_outreach@state.co.us.

Tenga en cuenta: Si desea solicitar interpretación al español, envíe un mensaje por correo electrónico a cdphe_apcd_outreach@state.co.us.


The Greenhouse Gas Annual Emissions Reports were due March 31, 2024. The form is still open and can be accessed for corrections or additional submissions if needed.



In 2019, Colorado adopted Senate Bill 19-096. It requires sources of greenhouse gases to monitor and report their emissions to the state. These reports support Colorado’s work to reduce greenhouse gases and maintain an inventory. The bill supported Executive Order D 2017-015, which directed CDPHE to propose a greenhouse gas reporting rule mirroring the federal reporting rule under 40 CFR, Part 98, among other requirements. 
In 2020, the Air Quality Control Commission adopted the Colorado Greenhouse Gas Reporting Rule under Air Quality Control Commission Regulation 22, Part A. The rule: 

  • Requires all greenhouse gas sources that are subject to the federal rule to also report emissions to the state. 
  • Expands reporting requirements to greenhouse gas sources that are not subject to the federal rule. 
  • Establishes supplemental data reporting requirements for Colorado electric service providers or utilities. This provides the division with the necessary data to assess compliance with the approved Clean Energy Plans

The state rule requires certain greenhouse gas sources to submit reports to the division regardless of the amount of greenhouse gases they emit annually. The sources include:

  • Electric service providers or utilities.
  • Natural gas local distribution companies.
  • Industrial waste landfills.
  • Industrial wastewater treatment operations.
  • Underground coal mines.     

Greenhouse gas reporting web portal and reporting form

The division established a reporting form to submit annual greenhouse gas reports, which can be accessed through the Emissions Reporting and Credit Tracking & Trading Portal. Sources subject to state reporting requirements must register and use the web portal and reporting form. The reporting deadline is March 31 of each year for the prior calendar year’s greenhouse gas emissions.
The division requires greenhouse gas sources subject to the state rule to use the Extensible Markup Language (XML) file generated for the facility or entity from the U.S. EPA’s Electronic Greenhouse Gas Reporting Tool (e-GGRT). The XML file contains the necessary greenhouse gas emissions data that must be reported. Greenhouse gas reporters subject to the state rule but not subject to the federal rule can still use e-GGRT to generate an XML file for reporting to the State of Colorado without reporting their greenhouse gas emissions to the EPA.
See the frequently asked questions for more details and answers to other questions regarding the greenhouse gas web portal and reporting form.

The e-GGRT Instructions document for Colorado greenhouse gas reporters provides detailed information on generating and downloading the correct XML file in e-GGRT for submission to the state.


Electric utility supplemental data reporting

Electric service providers or utilities that are subject to the state rule, as detailed under Regulation 22, Part A, Section IV.C., must submit supplemental data reports by June 30 of each year for the prior calendar year. Annual reports must be completed using the division’s form. The 2024 Electric Utility Supplemental Data form has been updated for reporting year 2023. The completed form must be uploaded to the Greenhouse Gas Annual Emissions Reporting form.

To access the Electric Utility Supplemental Data Form from prior years, contact climatechange@state.co.us