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Published: April 25, 2021

Updated Puget Sound Area Transmssion Expansion Plan

ColumbiaGrid’s Puget Sound Area Study Team has updated its 10-year Transmission Expansion Plan for the Puget Sound Area.  The plan was developed to provide economical and reliable service to Puget Sound Area load while minimizing the risk of curtailing power transfers between the Northwest and Canada.  The update was developed to study additional alternative projects suggested for the area and to study significant system changes that occurred since the last report was finalized.  The update is available on the CG website at


Member: Chelan County PUD      Project: ColumbiaGrid     
Chelan County PUD

"Chelan PUD is a strong supporter of ColumbiaGrid and the work that’s accomplished through the transmission Planning and Expansion Functional Agreement (PEFA). As a result of that process, the mid-C utilities (Chelan, Grant and Douglas PUDs) and Bonneville Power Administration were able to reach an agreement that defined the need for a new transmission line, as well as determine who will construct, own and pay for the facility. Those difficult decisions were made successful through the expert and independent expertise of the ColumbiaGrid staff."
~~ Chad Bowman, Director - Transmission and Compliance