Rocky Mountain Power Seeks $4.1M ECAM Recovery

Office of the Secretary Service Date April 20, 2026

BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION

IN THE MATTER OF ROCKY MOUNTAIN ) CASE NO. PAC-E-26-05 POWER'S APPLICATION REQUESTING ) APPROVAL TO RECOVER $4.1 MILLION ) ASSOCIATED WITH THE ECAM ) DEFERRAL AND REFUND $1.4 MILLION ) NOTICE OF MODIFIED ASSOCIATED WITH THE RRA ) PROCEDURE ) ) ORDER NO. 37006

On April 1, 2026, Rocky Mountain Power, a division of PacifiCorp ("Company") applied to the Idaho Public Utilities Commission ("Commission") requesting authorization to adjust its rates under the Energy Cost Adjustment Mechanism ("ECAM"). Specifically, the Company requests that the Commission approve: (1) approximately $4.1 million in ECAM deferral--and a corresponding 0.7% decrease to Schedule No. 94, Energy Cost Adjustment ("Schedule 94"); and (2) returning $1.4 million in renewable energy credit ("REC") revenue to customers under Schedule No. 98, REC Revenue Adjustment ("Schedule 98")--and a corresponding 0.4% decrease in rates ("Application"). Application at 1. The Company requests that this matter be processed by Modified Procedure and become effective on June 1, 2026. Id. at 10. The Commission now issues this Notice of Application and Notice of Modified Procedure establishing written comment deadlines.

BACKGROUND

The ECAM allows the Company to increase or decrease its rates each year to reflect changes in the Company's power supply costs. These costs vary by year with changes in the Company's fuel (gas and coal) costs, surplus power sales, power purchases, and associated transmission costs. Each month, the Company tracks the difference between the actual net power costs ("NPC") it incurred to serve customers, and the embedded (or base) NPC it collected from customers through base rates established in the most recent general rate case. The Company defers the difference between actual NPC and base NPC into a balancing account for treatment at the end of the yearly deferral period. At that time, the ECAM allows the Company to credit or collect the difference between actual NPC and base NPC through a temporary decrease or increase in customer rates.

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YOU ARE HEREBY NOTIFIED that, besides the NPC difference, the Company's proposed ECAM adjustment under Schedule 94 for January 1, 2025 through December 31, 2025 includes: (1) Load Change Adjustment Revenues; (2) coal stripping costs under Emerging Issues Task Force 04- 6; (3) Production Tax Credits; (4) the reasonable energy price, as defined in the 2020 Protocol; (5) qualified facility costs; and (6) wind availability liquidated damages. Application at 3. YOU ARE FURTHER NOTIFIED that the Company proposes Schedule 94 rates of 1.064, 1.044, and 1.009 cents per kilowatt-hour ("kWh") for secondary, primary, and transmission delivery service voltages, respectively, and represents that those rates would result in a 0.6% decrease for standard tariff customers, a 1.1% decrease for Schedule 400 customers, and an overall 0.7% decrease for Idaho customers. Id. at 7. YOU ARE FURTHER NOTIFIED that the Company represents its proposed rates for Schedule 98 would result in a 0.6% decrease for standard tariff customers, no change for Schedule 400 customers, and an overall 0.4% decrease for Idaho customers. Id. at 8-9. YOU ARE FURTHER NOTIFIED that the Application and testimony are available for public inspection during regular business hours at the Commission's office. These documents are also available on the Commission's website at www.puc.idaho.gov. Click on the "ELECTRIC" icon, select "Open Cases," and click on the case number as shown on the front of this document. YOU ARE FURTHER NOTIFIED that all proceedings in this case will be held pursuant to the Commission's jurisdiction under Title 61 of the Idaho Code, and that all proceedings in this matter will be conducted pursuant to the Commission's Rules of Procedure, IDAPA 31.01.01.000 et seq.

YOU ARE FURTHER NOTIFIED that the Commission has determined that the public interest may not require a formal hearing in this matter, and that it will proceed under Modified Procedure pursuant to the Commission's Rules of Procedure 201-204, IDAPA 31.01.01.201-.204. The Commission notes that Modified Procedure and written comments have proven to be an effective means for obtaining public input and participation. YOU ARE FURTHER NOTIFIED that persons desiring to state a position on this Application may file a written comment explaining why the person supports or opposes the Application. Persons who would like a hearing must specifically request a hearing in their written comments and explain

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why written comments alone are insufficient. Persons interested in filing written comments, must

do so by May 8, 2026. Comments must be filed through the Commission's website or by e-mail

unless computer access is unavailable. To comment electronically, please access the Commission's website at http://www.puc.idaho.gov/. Click the "Case Comment Form" and complete the form using the case number as it appears on the front of this document. To file by e-mail, persons must e-mail the comments to the Commission Secretary and all parties at the e-mail addresses listed below. Persons submitting a comment by e-mail must provide their name, address, and the Case Number under which they are commenting. Persons submitting a comment by e-mail also acknowledge that submitting a comment in an open case constitutes a public record under Idaho Code § 74-101(13), and all information provided by such person is available for public and media inspection. If computer access is unavailable, then comments may be mailed to the Commission and the Parties at the addresses below. Persons submitting a comment by mail must provide their name, address, and the Case Number under which they are commenting. Persons submitting a comment by mail also acknowledge that submitting a comment in an open case constitutes a public record under

Idaho Code § 74-101(13), and all information provided by such person is available for public and

media inspection.

For the Idaho Public Utilities For the Company:

Commission:

Commission Secretary Joe Dallas Idaho Public Utilities Commission 925 NE Multnomah Street, Suite 2000 P.O. Box 83720 Portland, OR 97232 Boise, ID 83720-0074 joseph.dallas@pacificorp.com secretary@puc.idaho.gov Jana Saba 1407 West North Temple, Suite 330 Salt Lake City, UT 84116 ana.saba pacificorp.com YOU ARE FURTHER NOTIFIED that the Company must file any reply comments by May

15, 2026.

YOU ARE FURTHER NOTIFIED that if no written comments or protests are received within the time limit set, the Commission will consider this matter on its merits and enter its final order

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without a formal hearing. If written comments are received within the time limit set, the Commission will consider them and, in its discretion, may set the same for formal hearing.

ORDER

IT IS HEREBY ORDERED that this Application be processed under Modified Procedure. Persons interested in submitting written comments must do so by May 8, 2026. The Company must file any reply comments by May 15, 2026. IT IS FURTHER ORDERED that parties comply with Order No. 35375, issued April 21,

1. Generally, all pleadings should be filed with the Commission electronically and will be deemed timely filed when received by the Commission Secretary. See Rule 14.02. Service between parties should continue to be accomplished electronically when possible. However, voluminous discovery- related documents may be filed and served on CD-ROM or a USB flash drive. DONE by Order of the Idaho Public Utilities Commission at Boise, Idaho this 20 day of th April 2026. __________________________________________ EDWARD LODGE, PRESIDENT __________________________________________ JOHN R. HAMMOND JR., COMMISSIONER __________________________________________ DAYN HARDIE, COMMISSIONER ATTEST: Monica Barrios-Sanchez Commission Secretary

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