About the Power Grid

ColumbiaGrid map iconClick Here for a map of the network owned and operated by ColumbiaGrid's transmission planning participants. >>

The high-voltage transmission systems owned by ColumbiaGrid’s members and participants make up a substantial network.  This network provides bulk transmission service to meet the demands of electricity customers within a quarter-million square mile footprint in the states of Oregon, Washington, Idaho, Montana, California, Wyoming, Nevada, and Utah.

The ColumbiaGrid participants own nearly 22,000 miles of transmission at voltages greater than 100 kV.  Our members and participants interconnect with other major transmission networks in Canada and the Western states and are well positioned for wholesale transactions.

The ColumbiaGrid facilities are likely to change over time as new members and participants come on board.  Our vision for the future includes attracting additional entities that generate, transmit, or deliver power in the states listed above, as well as in the Canadian provinces of British Columbia and  Alberta.      


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