Idaho Power and Rocky Mountain Power announced plans in May, 2007, to build more than 1,000 miles of 500-kilovolt transmission lines across Wyoming and southern Idaho. Click for a printable map (PDF, 495KB) or fact sheet (PDF, 610KB). To submit comments or questions, visit the Contact Information page.

This project is required to meet customer load growth needs as well as increase transmission capacity and reliability for our respective service areas. Segments are scheduled to be complete in 2012. Click for the proposed project schedule.

Under many conditions, Idaho Power’s lines are already at full capacity. As a transmission provider, the company has the obligation to plan and construct transmission facilities to ensure reliable electric service to customers—a process requiring seven to 10 years.

Purpose and Benefits
The proposed Gateway West transmission project will:

• Help meet the growing demand for electricity and economic development in the region;
• Improve transmission system reliability;
• Respond to customer requests for new transmission capacity;
• Respond to customer demand for increasing amounts of renewable energy, particularly wind energy;
• Strengthen the integrated transmission network;
• Relieve congestion on existing facilities.

Environmental Review
Together, Idaho Power and Rocky Mountain Power will conduct all necessary environmental analysis to comply with the National Environmental Policy Act (NEPA) and will work with the Bureau of Land Management to create an environmental impact statement (EIS). The EIS is the basis for the BLM’s determination whether to issue right of way grants across federal lands. Additionally, coordination with other Federal and State environmental and permitting agencies will also be required.

The two companies will also conduct public information meetings with various federal, state and local governmental agencies, local property owners and other interested parties as the project develops.