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Home My WebLink About20260226Supplemental Application.pdf Mq% -`-1 Re Lisa C. Lance Corporate Counsel RECEIVED Ilance(EDidahopower.com FEBRUARY 26, 2026 IDAHO PUBLIC UTILITIES COMMISSION February 26, 2026 VIA ELECTRONIC FILING Commission Secretary Idaho Public Utilities Commission 11331 W. Chinden Blvd., Bldg 8, Suite 201-A (83714) PO Box 83720 Boise, Idaho 83720-0074 Re: Case No. I PC-E-25-35 Idaho Power Company's Compliance with Order Nos. 34031 and 35816 for a Prudence Determination of Hells Canyon Complex Relicensing Costs from January 1, 2016 through December 31, 2025 Dear Commission Secretary: Attached for electronic filing please find Idaho Power Company's Supplemental Application and the Supplemental Direct Testimony of Brett Dumas in the above-entitled matter. In a separate email, I will send the Word version of the testimony for the Reporter. If you have any questions about the attached documents, please do not hesitate to contact me. Very truly yours, Lisa C. Lance LCL:sg Attachments 1221 W. Idaho St(83702) P.O. Box 70 Boise, ID 83707 LISA C. LANCE (ISB No. 6241) Idaho Power Company 1221 West Idaho Street (83702) P.O. Box 70 Boise, Idaho 83707 Telephone: (208) 388-2664 Facsimile: (208) 388-6935 Ilance(o)_idahopower.com Attorney for Idaho Power Company BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION IN THE MATTER OF THE APPLICATION ) OF IDAHO POWER COMPANY'S ) CASE NO. IPC-E-25-35 COMPLIANCE WITH ORDER NOS. 34031 ) AND 35816 FOR A PRUDENCE ) SUPPLEMENTAL APPLICATION DETERMINATION OF HELLS CANYON ) COMPLEX RELICENSING COSTS FROM ) JANUARY 1 , 2016, THROUGH ) DECEMBER 31 , 2025. ) Idaho Power Company ("Idaho Power" or"Company"), hereby respectfully submits to the Idaho Public Utilities Commission ("Commission") this Supplement to the Company's Application pursuant to Procedural Rule 52 to provide updated Hells Canyon Complex ("HCC") relicensing cost information through December 31 , 2025, in support of Idaho Power's request that the Commission issue an order designating Idaho Power's HCC relicensing expenditures from January 1, 2016 to December 31, 2025, as prudently incurred. In support of this Supplemental Application, Idaho Power states: SUPPLEMENTAL APPLICATION - 1 1. On December 24, 2025, Idaho Power filed its Application requesting that the Commission designate Idaho Power's HCC relicensing expenditures incurred from January 1, 2016, through September 30, 2025, as prudently incurred and eligible for inclusion in customer rates at a later date. The Company stated it would submit a supplemental application in early 2026 to include expenditures incurred through year-end 2025. 2. Idaho Power now supplements its Application to include HCC relicensing expenditures incurred through December 31, 2025. The updated costs are presented in Supplemental Exhibit No. 1 to the Supplemental Testimony of Company Witness Brett Dumas and in Attachment 1 to this Supplemental Application, each of which replaces the corresponding materials filed with the original Application. 3. As reflected in the Supplemental Dumas Testimony and updated materials, total HCC relicensing expenditures incurred from January 1, 2016, through December 31, 2025, are approximately $315 million, of which approximately $268 million is classified as Allowance for Funds Used During Construction ("AFUDC"). 4. This Supplemental Application does not modify the Company's request for a prudence determination, nor does it request any adjustment to customer rates at this time. The Company respectfully requests that the Commission consider the updated cost information together with the original Application and testimony filed in this proceeding. 5. In Order No. 34031 issued in Case No. IPC-E-16-32, the Commission approved a Settlement Stipulation requiring Idaho Power to provide annual reports summarizing HCC relicensing activities and expenditures for the prior calendar year. Consistent with that framework, this filing presents the information that would otherwise SUPPLEMENTAL APPLICATION -2 have been provided to the Commission in a standalone annual report, including a comprehensive update on HCC relicensing expenditures incurred through December 31, 2025, together with supporting information related to the Company's ongoing relicensing efforts. 6. Accordingly, the Company respectfully requests that the Commission accept this Supplemental Application, together with Attachment 1 and Supplemental Exhibit No. 1 to the Supplemental Testimony of Brett Dumas, as satisfying Idaho Power's annual HCC relicensing expenditure reporting obligation under Order No. 34031 for costs incurred through December 31, 2025. WHEREFORE, Idaho Power respectfully requests that the Commission accept this Supplemental Application and the Company's updated supporting materials; deem this Supplemental Application, together with Attachment 1 and Supplemental Exhibit No. 1, to satisfy Idaho Power's 2025 HCC relicensing expenditure reporting obligation under Order No. 34031; and grant the relief requested in the Company's original Application, as supplemented herein. DATED at Boise, Idaho, this 26t" day of February 2026. /V. G/� LISA C. LANCE Attorney for Idaho Power Company SUPPLEMENTAL APPLICATION - 3 CERTIFICATE OF SERVICE I HEREBY CERTIFY that on the 26t" day of February 2026, 1 served a true and correct copy of Idaho Power Company's Supplemental Application upon the following named parties by the method indicated below, and addressed to the following: Commission Staff Hand Delivered Jeffrey R. Loll U.S. Mail Deputy Attorney General Overnight Mail Idaho Public Utilities Commission FAX 11331 W. Chinden Blvd., Bldg No. 8 FTP Site Suite 201-A (83714) X Email PO Box 83720 jeff.loll puc.idaho.gov Boise, ID 83720-0074 Industrial Customers of Idaho Power Hand Delivered Peter J. Richardson U.S. Mail Richardson Adams, PLLC Overnight Mail 515 N. 27t" Street FAX Boise, Idaho 83702 FTP Site X Email Peter _richardsonadams.com Stacy Gust Regulatory Administrative Assistant SUPPLEMENTAL APPLICATION -4 BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION CASE NO. IPC-E-25-35 IDAHO POWER COMPANY ATTACHMENT NO. 1 RELICENSING EXPENDITURES BY COST ELEMENT 1997-2025 HCC RELICENSING EXPENDITURES(OOO's) 1997-2025 Cost Element 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Total IPCO Labor 1,467 2,218 2,808 3,258 3,461 3,724 3,586 2,351 1,867 1,947 1,559 1,510 1,727 1,723 1,636 1,682 1,792 1,846 2,071 2,385 2,413 2,275 2,309 2,119 1,900 1,691 2,044 1,437 1,099 61,905 Materials 56 142 267 272 129 111 175 163 232 165 147 132 60 119 35 43 80 45 76 391 107 68 137 87 49 31 47 19 15 3,403 Purchased Services 1,016 2,209 3,610 4,663 3,512 2,659 2,825 3,151 3,036 3,541 2,549 1,878 1,825 1,523 1,890 2,537 3,087 2,729 3,037 6,783 4,208 3,095 2,947 2,775 2,417 1,668 1,420 540 319 77,448 Accounting Entries - - - 137 160 114 137 137 137 137 137 137 137 137 137 137 137 137 137 133 137 137 137 137 137 236 236 386 399 4,273 General Overheads - 142 191 11 (6) 0 - 0 1 2 1 - - - - - - - - - - - - - - - - - 343 Other Expenses 360 548 783 604 295 452 352 533 260 (79) 247 214 216 159 148 191 228 204 718 54 (4,796) 1,082 505 290 250 185 299 277 195 4,773 Subtotal 2,898 5,259 7,659 8,945 7,551 7,061 7,075 6,335 5,534 5,713 4,639 3,872 3,966 3,662 3,847 4,592 5,324 4,962 6,040 9,746 2,069 6,656 6,035 5,409 4,754 3,810 4,046 2,660 2,027 152,144 AFUDC - - 948 1,584 1,038 1,695 3,695 3,686 4,365 4,758 5,497 5,376 7,785 9,437 10,804 11,764 12,976 14,535 15,854 18,373 17,375 21,374 23,624 25,313 27,685 30,016 32,597 34,503 37,115 383,772 Grand Total 2,898 5,259 8,607 10,530 8,589 8,756 10,770 10,022 9,898 10,472 10,137 9,248 11,751 13,099 14,651 16,356 18,300 19,496 21,893 28,119 19,443 28,030 29,659 30,722 32,439 33,826 36,643 37,163 39,142 535,916 1.Idaho Power is authorized to recover a portion of the AFUDC on HCC relicensing expenditures.As of December 31,2025,the Company had recorded a regulatory liability of$281 million for collection of AFUDC on HCC relicensing expenditures.