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Published: April 25, 2011

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: Tacoma Power      Project: ColumbiaGrid     
Tacoma Power

"As a charter member of ColumbiaGrid, Tacoma Power has observed the benefits for its customers of regional transmission planning. Engaging in the ColumbiaGrid collaborative transmission planning process has fostered diverse and innovative solutions. This open process for identifying and resolving transmission challenges has delivered cost-effective reliability to our entire region."
~~ William A. Gaines, Director of Utilities