Boardman to Hemingway

Boardman to Hemingway is crucial to Clean Today, Cleaner Tomorrow® – Idaho Power’s goal of providing 100% clean energy by 2045. This transmission line will allow Idaho Power to import clean energy from the Pacific Northwest to meet growing demand in southern Idaho and eastern Oregon.

What is it?

Boardman to Hemingway, or “B2H,” is a proposed 500-kilovolt transmission line that will run approximately 290 miles across eastern Oregon and southwestern Idaho. It will connect the proposed Longhorn Substation four miles east of Boardman, Oregon, to Idaho Power’s existing Hemingway Substation in Owyhee County, Idaho.

Why is it needed?

Existing transmission lines between the Pacific Northwest and Idaho Power’s service area can’t carry any more energy when it is needed most. The Boardman to Hemingway line will provide the ability to deliver approximately 1,000 megawatts of clean, affordable power in each direction, helping Idaho Power meet customer demand, especially during summer peaks.

B2H is a cleaner, less expensive, lower risk solution than building new carbon-emitting plants, and it’s less expensive than building new solar or battery storage plants.

Who’s involved?

Idaho Power is working with two other utilities, PacifiCorp and Bonneville Power Administration, to obtain permits for the project. Idaho Power, which is leading federal, state and local permitting efforts, has a 21% share of the project. BPA has a 24% share, and PacifiCorp has the remaining 55%.

What’s the schedule?

Idaho Power expects to finalize B2H permitting in 2022. We expect construction to take three to four years. The line is planned to be in service in 2026 or later.

More information

For more details, including maps, documents and photo simulations of the line, visit the project’s website,

The project website is a collaboration between Idaho Power, the Oregon Department of Energy, the Bureau of Land Management and the U.S. Forest Service.

Our View

Read our latest columns on B2H from Mitch Colburn, Idaho Power’s Vice President of Planning, Engineering and Construction:

The Boardman to Hemingway Project is Idaho Power’s “Clean-Energy Pipeline”

B2H is the Right Project at the Right Time

Contact Information

If you have questions about the Boardman to Hemingway project or have information you want to share, send an email to