I-5 Corridor Reinforcement Project

The I-5 Corridor Reinforcement Project is a 79-mile, 500-kV transmission line, originating at Castle Rock, Washington, and terminating at Troutdale, Oregon. The transmission line, proposed by Bonneville Power Administration (BPA), will cost approximately $459 million and is scheduled to be energized in 2018. The project will increase capacity and relieve congestion in the Longview, Portland and Vancouver areas.  It will also serve point-to-point transmission service requests.  Three alternative routes were originally estimated to cost $363M, $406M and $407M respectively. A decision on this project is expected in late 2016.

Project Sponsor Line Miles Voltage (kV) From State To State Year in Service
Bonneville Power Administration 79 500 WA OR 2018
Estimated Costs ($M) Voltage Type Project Status Project Group Origin Point Destination Point
459 Suspended Castle Rock Troutdale
Interstate Build Start NERC ISO/RTO Country Project Partners
2016 WECC US BPA and US Department of Energy