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



PUC 3627 transmission projects

Updates and additions to the projects to be considered in the PUC 3627 2018 filing:


Filing Details PUC 3627

Details included in the filing for the Colorado PUC Rule 3627 on February 1, 2016:


20-year conceptual scenario report


Past filings

COPUC 3627 transmission projects and reference documents - 2016 filing

COPUC 3627 transmission projects - 2014 filing