Gateway West Project

The Gateway West Project is a joint project being proposed by both Rocky Mountain Power and Idaho Power. The line will stretch nearly 1,000 miles of new 230-kV from the Windstar Substation near Glenrock, WY, to the Hemingway Substation near Melba, ID. The project will involve approximately 200 miles of 230-kV lines in Wyoming and another 800 miles of 500-kV lines in both Wyoming and Idaho. Both Rocky Mountain Power and Idaho Power anticipate that construction of the project can commence towards the beginning of 2016 upon all regulatory approval. The final in-service date would then be expect by the end of 2024. The entire project is part of an effort to ensure electric system reliability in the area as well as provide greater carrying capacity for renewable energy sources.

Project Sponsor Line Miles Voltage (kV) From State To State Year in Service
PacifiCorp - West 1000 500 ID WY 2024
Estimated Costs ($M) Voltage Type Project Status Project Group Origin Point Destination Point
3680 Planned EGP Hemingway Windstar
Interstate Build Start NERC ISO/RTO Country Project Partners
2019 WECC US Rocky Mountain Power, Idaho Power