20231101Rocky Mountain Power IRP Press Release.pdf

Case No. PAC-E-23-10
Order No. 35977
Contact: Adam Rush
Office: [phone]
E-mail: [e-mail]

NEWS RELEASE: Commission acknowledges eastern Idaho electric utility’s Integrated
Resource Plan.

BOISE (Nov. 1, 2023) – The Idaho Public Utilities Commission has acknowledged Rocky
Mountain Power’s 2023 Integrated Resource Plan (IRP) to meet future energy and demand
requirements for its customers.

The utility’s IRP is filed with the commission on a biennial basis. Rocky Mountain Power said
the plan fulfills its commitment to develop a long-term resource plan that considers cost, risk,
uncertainty and the public interest. The utility said the 2023 IRP preferred portfolio includes new
resources from the 2020 all-Source Request for Proposals (RFP) including 1,792 megawatts
(“MW”) of wind and 495 MW of solar additions with 200 MW of battery storage capacity. The
utility said these are scheduled to come online between 2024 and 2025.

Rocky Mountain Power’s plan also calls for acquiring and repowering the Rock River I and
Foote Creek II-IV wind projects in Wyoming. The utility also said the 2023 IRP preferred
portfolio includes the 500 megawatt advanced nuclear Natrium demonstration project, which is
anticipated to go online by the summer of 2030, 1,000 megawatts of additional advanced nuclear
resources through 2033 and 1,240 megawatts of non-emitting peaking resources through 2037.

The preferred portfolio also includes construction of the Gateway South 416-mile 500-kilovolt
transmission line that will connect southeastern Wyoming and northern Utah, the Gateway West
Segment D.1 59-mile 230 kilovolt transmission line in eastern Wyoming and the Boardman to
Hemingway 500 kilovolt, 290-mile transmission line across eastern Oregon and southwestern
Idaho.

The commission’s acknowledgement of the integrated resource plan reflects that it is a working
document that incorporates assumptions and projections at a specific point in time. The
commission acknowledges Rocky Mountain Power’s ongoing planning process, not the
conclusions or results reached through that process.

Additional information is available at puc.idaho.gov/case/Details/7019.