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Integrated Resources Planning

Connecticut General Statutes section 16a-3a requires that the Department of Energy and Environmental Protection (DEEP) prepare an Integrated Resource Plan every two years. An Integrated Resource Plan (IRP) is comprised of an assessment of the future electric needs and a plan to meet those future needs.  It is “integrated” in that it looks at both demand side (conservation, energy efficiency, etc.) resources as well as the more traditional supply side (generation/power plants, transmission lines, etc.) resources in making its recommendations on how best to meet future electric energy needs in the state.

Cover image of the IRP
2020 IRP

This latest IRP marks Connecticut’s first assessment of pathways to achieve a 100 percent zero-carbon electric sector by 2040, as directed by Governor Ned Lamont through his Executive Order No.3 (E.O. 3). Consistent with the Governor’s intent, this IRP focuses in the near term on areas of reform essential to facilitating the transition to a zero carbon electric sector; to ready the grid with modernized transmission systems, to reform the regional wholesale market, and to implement and synchronize policies and programs that promote affordability and equity.

2020 Final IRP- Released October 7, 2021

*NEW* Download the 2020 Final IRP 

Appendix A1 - Factor Inputs and Assumptions

Appendix A2 - MARS Modeling

Appendix A3 - Modeling Results

Appendix A4 - Financial Analysis Results

Appendix A5 - Siting Solar Fact Sheet

Appendix A6 - Procurement Selections and Pricing

Appendix A7 - Carbon Tax Modeling Results

*NEW* Appendix A8- Public Comment Review Report

*NEW* 2020 IRP Glossary of Terms

December 2020 Draft IRP and Appendices 

Download the 2020 Draft IRP


*NEW* Download the Notice of Biomass Phasedown Exemption Identification Procedure per Public Act 13-303

*NEW* Download the Notice of Proceeding for DEEP Storage Request for Information

*NEW* Download the Notice of DEEP Request for Comment on GHG Accounting

Download the Notice of Extended Opportunity for Written Comments 

Download the Notice of Public Hearings, Technical Meetings, and Request for Comment

Public Meeting Recordings and Transcripts

View the January 14, 2021 Public Hearing Zoom Recording and Unofficial Transcript (Day Session)

View the January 14, 2021 Public Hearing Zoom Recording and Unofficial Transcript (Evening Session) 

View the January 21, 2021 Policy Technical Meeting Zoom Recording and Unofficial Transcript

View the January 28, 2021 Modeling Technical Meeting Zoom Recording and Unofficial Transcript 

Slide Decks 

Download the January 14, 2021 Public Hearing Slide Deck

Download the January 21, 2021 Policy Technical Meeting Slide Deck

Download the January 28, 2021 Modeling Technical Meeting Slide Deck

Additional Background

DEEP initiated the 2020 IRP proceeding with the release of a Notice of Proceedings, Scoping Meeting, and Opportunity for Public Comment in May of 2018 and received stakeholder comment on a preliminary scope.  However, since that time, new market and policy developments have occurred including multiple DEEP-conducted competitive procurements for zero carbon resources, the enactment of landmark legislation authorizing DEEP to procure up to 2,000 MW of offshore wind, and on September 3, 2019, Governor Lamont signed Executive Order No. 3 directing DEEP, in consultation with the Public Utilities Regulatory Authority as appropriate, to "analyze pathways and recommend strategies for achieving a 100% zero carbon target for the electric sector by 2040" in the IRP. 

These developments warranted a revision to the IRP scope and additional opportunities for stakeholder engagement to ensure that the IRP's analysis and recommendations address current issues of importance for Connecticut's electricity sector.  On October 15, 2019, DEEP issued a Notice of Revised Scope, Updated Schedule, and Opportunity for Public Comment which included: 

  • a policy assessment of deregulation; 
  • pathways to a 100% zero carbon electric grid (modeling analysis);
  • recommendations for the creation of a Thermal Renewable Portfolio Standard;
  • recommendations on an offshore wind procurement schedule; and 
  • recommendations for a biomass generation phase-down schedule.  

To access the full record of available documents, appendices, and comments associated with the 2018 IRP, please visit the DEEP Energy Filings page

Past IRPs
2014 IRP

2014 Integrated Resources Plan for Connecticut (Final)

Appendix A: Detailed Tables

Appendix B: Resource Adequacy

Appendix C: Energy Efficiency

Appendix D: Renewable Energy

Appendix F: Transmission Planning Appendix G: Energy Security, Storm Resiliency, and New Technology

Appendix H: Comments  

2012 Integrated Resources Plan (Final)

2010 Integrated Resources Plan (Final)

2008 Integrated Resources Plan (Final)

To view all DEEP Energy filings, including all documents, appendices and comments associated with the IRP, select the link below:

DEEP Energy Web Filings

Any questions on the above-referenced processes should be addressed to

Content last updated October 2021