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Published: February 18, 2015

Board Approves ColumbiaGrid 2015 Biennial Tranmission Expansion Plan

At their February 18, 2015 meeting, ColumbiaGrid’s Board of Directors adopted the 2015 Biennial Transmission Expansion Plan. The 2015 Biennial Plan looks at a ten-year planning horizon (2015 through 2024) and includes approximately 56 new transmission projects and enhancements, at an estimated cost of over $2.5 billion, over the ten-year planning horizon. The 2015 Biennial Plan document is posted on ColumbiaGrid’s website and can be found at (

For more information, please contact Paul Didsayabutra 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