Connecticut Greenhouse Gas Inventory Reports

The state of Connecticut has set several climate-related goals. DEEP tracks progress toward meeting these goals and has published a number of reports on the progress made in reducing statewide greenhouse gas (GHG) emissions over specific years. Below are Connecticut's published reports, starting with the most recent report.

New! 1990-2024 Greenhouse Gas Inventory Report (released November 2026)
Supporting Data

New! Final Connecticut's Climate Progress Report - April 2026
Public Comments
View Notice of Public Comment 1.23.26

Greenhouse Gas Inventory Dashboard

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Previous GHG Emissions Inventory Reports and Materials:

• 1990-2023 GHG Emissions Inventory and supporting Data (updated September 2025)
• CT GHG Emissions Inventory 1990-2021 with preliminary look at 2022 (updated June 18, 2024)
• CT GHG Emissions Inventory 1990-2021 and supporting data (released 2023)
• Proposed Methodology for Electricity-Sector GHG Accounting: Presentation | Video (October 26, 2021) | Notice of Public Meeting and Comment Opportunity | Public Comments
• CT GHG Emissions Inventory 2018 and supporting data (released 2021)
• CT GHG Emissions Inventory 2017 and supporting data  (released 2020)
• CT GHG Emissions Inventory 2016 and supporting data  (released 2018)
• CT GHG Emissions Inventory 2015 (released 2018)
• CT GHG Emissions Inventory 2014 (released 2017)
• CT GHG Emissions Inventory 2013 and supporting data
• CT GHG Emissions Inventory 2012  (released 2015)
• CT GHG Emissions Inventory 2011  (released 2014)
• Taking Action on Climate Change: 2014 Progress Report  (released 2014)
• 2010 CT GHG Emissions Mitigation Options Overview  (released 2010)
• 2009 CT GHG Inventory with Appendices  (released 2010)
• 2007 Progress Report  (released 2007)
• 2006 Progress Report  (released 2007)
• CT GHG Inventory: 1990-2001  (released 2006)
• 2005 Progress Report  (released 2006)
• CT GHG Inventory: 1990-2000  (released 2003)

National Greenhouse Gas Report:

• EPA - U.S. Greenhouse Gas Inventory Report: 1990-2013
• Connecticut comments on U.S. EPA Clean Power Plan