Transmission planning

Transmission planning

Each year, Tri-State develops a 10-year transmission plan that assesses future transmission needs for Tri-State’s 43 member electric cooperatives. 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 a new requirement of the Colorado Public Utilities Commission (COPUC), called Rule 3627, Tri-State filed its 10-year transmission plan with the COPUC on February 1, 2014.

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



Filing Details PUC 3627

Details included in the filing for the Colorado PUC Rule 3627 on February 1, 2018:

10-year transmission plan 2018

20-year conceptual scenario report 2018

Appendix A - Colorado transmission maps 2018

Appendix B - Metro Denver transmission map 2018

Appendix C - Black Hills Energy transmission map 2018

Appendix D - Black Hills Energy projects 2018

Appendix E - Tri-State G&T 10-year transmission projects 2018

Appendix F - Public Service Company of Colorado projects 2018

Appendix G - Colorado Springs Utilities projects 2018

Appendix H - Platte River Power Authority project 2018

Appendix I - WAPA projects 2018

Appendix J - CCPG stakeholder process 2018

Appendix K - CCPG comment forms 2018

Appendix L - Black Hills Supporting Documents 2018 

Appendix M - Tri-State G&T supporting documents 2018

Appendix N - Public Service dupporting documents 2018


Past filings

COPUC 3627 transmission projects and reference documents - 2016 filing

COPUC 3627 transmission projects - 2014 filing