About the project

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.

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 percent share of the project. BPA has a 24 percent share, and PacifiCorp has the remaining 55 percent.

What’s the schedule?

Idaho Power expects to finalize B2H permitting in 2022. Construction is expected to take three to four years. The line is planned to be in-service in 2026 or later.

An image showing the schedule for the state and federal permitting processes and the pre-construction and construction activities for Boardman to Hemingway
Project Schedule

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. B2H 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 solution than building new carbon-emitting plants, and it’s less expensive than building new solar or battery storage plants. Visit Idaho Power's Clean Today, Cleaner Tomorrow page for information on Idaho Power's commitment to clean energy.

Idaho Power's Integrated Resource Plans (IRP) have consistently identified B2H since 2009 as the lowest cost and least risk option for meeting projected customer demand. The IRP is a roadmap describing how Idaho Power plans to meet current and future energy needs over the next 20 years.

Benefits identified in the 2019 IRP include:

  • Greater access to the Pacific Northwest electric market
  • Improved system reliability and resiliency
  • Reduced strain on the regional power grid
  • Flexibility to integrate renewable resources and efficiently trade energy

Visit Idaho Power’s Planning page for information on the IRP process and to view to the most recent edition.

This video describes the B2H project