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  • https://tristate.coop/sites/default/files/revslider/image/TS_TransmissionPlanning_Hero_020219.jpg

Each year, Tri-State develops a 10-year transmission plan that assesses future transmission needs for Tri-State’s member systems. The transmission component of this plan is developed in conjunction with West Connect and the Colorado Coordinated Planning Group (CCPG), formal regional transmission planning organizations recognized by the Western Electricity Coordinating Council (WECC).

As part of the Colorado Public Utilities Commission (COPUC), Rule 3627, Tri-State files its 10-year transmission plan with the COPUC on a biennial basis each February 1.

For more information, to send us your questions or comments regarding our transmission plans, or to be added to the stakeholder outreach list for future transmission planning meetings, please email TransmissionPlanning@tristategt.org.

 

Please email us your comments on Tri-State's transmission planning to TransmissionPlanning@tristategt.org.

In your comments, please include:

  • First and last name

  • Mailing address

  • Phone number(s)

  • Name of your organization

  • Indicate if you are  member of an electric cooperative, and if so, which one.

  • Please indicate which issue/project you are commenting about

Thank you for your interest.

Planning documents

Network model data

Stakeholder outreach

 

Filing Details PUC 3627

Details included in the filing for the Colorado PUC Rule 3627 on February 1, 2024:

2024 Rule 3627 20-Year Report

2024 Rule 3627 Combined 10-Year Report

Appendix A - Colorado Transmission Maps

Appendix B - Denver-Metro Transmission Map

Appendix C - Black Hills Energy Transmission Map

Appendix D - Black Hills Project Sheets

Appendix E - Tri-State Project Sheets

Appendix F - Public Service Projects

Appendix G - CSU Appendix Projects

Appendix H - PRPA Projects

Appendix I - WAPA Projects

Appendix J - CCPG Stakeholder Process

Appendix K - Public Service Stakeholder Comment

Appendix L - Black Hills Stakeholder Comments

Appendix M - CCPG Stakeholder Comments (Tri-State)

Appendix N - Black Hills Supporting Documents

Appendix O - Tri-State Supporting Documents

Appendix P - Public Service Supporting Documentation

Appendix Q - How to Access Model Data
 

Past filings

COPUC 3627 transmission projects and reference documents - 2022 filing

COPUC 3627 transmission projects and reference documents - 2020 filing

COPUC 3627 transmission projects and reference documents - 2018 filing

COPUC 3627 transmission projects and reference documents - 2016 filing

COPUC 3627 transmission projects - 2014 filing

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Tri-State Generation and Transmission Association
Office: 303-452-6111
1100 West 116th Avenue
Westminster, CO 80234

Mailing address:
PO Box 33695
Denver, CO 80233-0695

©2025 Tri-State Generation and Transmission Association, Inc. Power supplier to the rural west.

  • About Us
    • Annual Report
  • Powering the Future
    • Our Energy Mix
  • Electrify and Save®
    • On-Bill Repayment
    • Programs
    • Quality Install
  • Media
    • Resources
    • Blog
    • Features
    • News
    • Newsletter
    • Podcast
  • Cooperative Benefits
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