The URL can be used to link to this page

Home My WebLink About20260723Errata to Attachment No. 11 to Petition.pdf -�IQAFIO R® MEGAN GOICOECHEA ALLEN RECEIVED Corporate Counsel July 23, 2026 IDAHO PUBLIC mgoicoecheaallen(a)_idahopower.com UTILITIES COMMISSION July 23, 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. IPC-E-26-07 Idaho Power Company's Petition to Evaluate Class Cost-of Service Methodology, Consider Alternative Class Cost-of-Service Studies, and Determine Cost of Service Considerations for New Large-Load Customers Dear Commission Secretary: Attached for electronic filing please find Idaho Power Company's Errata to Attachment No. 11 to Petition in the above-entitled matter. The login information for the confidential portion of the FTP site has been provided to the parties that have executed the Protective Agreement in this matter. If you have any questions about the attached documents, please do not hesitate to contact me. Very truly yours, �_/%I k OA, I C2 a l l Megan Goicoechea Allen MGA:cd Attachments MEGAN GOICOECHEA ALLEN (ISB No. 7623) 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 mgoicoecheaallen(a-),idahopower.com Ilance(c)_idahopower.com Attorneys for Idaho Power Company BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION IN THE MATTER OF THE PETITION OF ) IDAHO POWER COMPANY TO EVALUATE ) CASE NO. IPC-E-26-07 CLASS COST-OF-SERVICE ) METHODOLOGY, CONSIDER ) ERRATA TO ATTACHMENT NO. 11 ALTERNATIVE CLASS COST-OF- ) TO PETITION SERVICE STUDIES, AND DETERMINE ) COST OF SERVICE CONSIDERATIONS ) FOR NEW LARGE-LOAD CUSTOMERS. ) Idaho Power Company ("Idaho Power" or "Company") hereby respectfully submits to the Idaho Public Utilities Commission ("Commission") this Errata to Attachment No. 11 (Hourly Informed Allocation Factor Derivation Workpapers) submitted in support of the Company's Petition to Evaluate Class Cost-of-Service Methodology, Consider Alternative Class Cost-of-Service Studies, and Determine Cost-of-Service Considerations for New Large-Load Customers filed on March 31, 2026, to ensure accuracy, consistency, and clarity of the record as follows. ERRATA TO ATTACHMENT NO. 11 TO PETITION - 1 1. Following the filing of the Petition, the Company became aware of certain labeling and worksheet presentation issues within the "AURORA Hourly Costs" worksheet contained in Confidential Attachment No. 11 - Hourly-Informed Allocation Factor Derivation Workpapers. More specifically, while the underlying data values, calculations, and outputs included in the worksheet are accurate, certain column headers were inadvertently transposed, an additional summary column combined the same cost categories with the total already reflected in the worksheet, and an incorrect column header reference was also included. 2. Upon identifying these discrepancies, the Company prepared a corrected version of the "AURORA Hourly Costs" worksheet in Confidential Attachment No. 11 to replace the version included its initial filing as discussed more fully below. 3. Specifically, the revised worksheet corrects the inadvertent transposition of column headers reflected in the originally filed worksheet, revising the column headers beginning with Column Q to read as follows: Market Purchases (Q), Elkhorn Wind PPA (R), Solar PPA (S), Other PPA (T), Market Sales (U), PURPA Solar (V), PURPA Wind (W), PURPA Other (X), Marginal Energy Sales (Y), and Total (Z). 4. In addition, while the Company determined that Column Z in the originally filed worksheet properly reflects total hourly cost by summing the applicable cost categories, as originally filed the worksheet also included an additional summation column (Column AA) that combined those same cost categories with the total already reflected in Column Z, thereby duplicating the costs reflected in that additional column. Although the additional summation column was referenced in developing the relative hourly shares used to derive hourly allocation percentages, the duplication scaled each hourly value uniformly and therefore did not change the normalized hourly allocation ERRATA TO ATTACHMENT NO. 11 TO PETITION - 2 percentages or resulting allocation factors. For clarity, the additional summation column has been removed from the corrected worksheet. 5. The Company also determined that "EIM Benefits" was inadvertently included as a column header within the "AURORA Hourly Costs" worksheet, although no EIM benefits were included in the AURORA output used for hourly cost shaping. Accordingly, the erroneous header reference has been removed from the corrected worksheet. 6. Though not material to the Company's Petition, for the sake of clarity of the record the Company is providing Revised Confidential Attachment No. 11 with this Errata, which corrects the labeling and presentation issues in the "AURORA Hourly Costs" worksheet as more fully explained above, to replace the original version of Confidential Attachment No. 11 filed with the Petition on March 31, 2026. The Company has confirmed that these corrections do not change any underlying AURORA hourly cost data, hourly cost calculations, derived hourly allocation percentages, resulting allocation factors, or conclusions presented in the Petition. These corrections also do not affect the other worksheets included in the Hourly Informed Allocation Factor Derivation Workpapers attachment, or any other portion of the Petition or supporting attachments. DATED at Boise, Idaho, this 23rd day of July 2026. 4wr T I' I �_R & Megan Goicoechea Allen Attorney for Idaho Power Company ERRATA TO ATTACHMENT NO. 11 TO PETITION - 3 CERTIFICATE OF SERVICE I HEREBY CERTIFY that on the 23rd day of July 2026, 1 served a true and correct copy of ERRATA TO ATTACHMENT NO. 11 TO PETITION upon the following named parties by the method indicated below, and addressed to the following: Commission Staff Hand Delivered Erika Melanson U.S. Mail Deputy Attorney General Overnight Mail Idaho Public Utilities Commission FAX 11331 W. Chinden Blvd., Bldg No. 8 FTP Site Suite 202-A (83714) X Email PO Box 83720 erika.melanson@puc.idaho.gov Boise, ID 83720-0074 Idaho Irrigation Pumpers Association, Hand Delivered Inc. U.S. Mail Eric L. Olsen Overnight Mail Echo Hawk & Olsen, PLLC FAX 505 Pershing Ave., Ste. 100 FTP Site P.O. Box 6119 X Email Pocatello, Idaho 83205 elo echohawk.com taysha _echohawk.com Lance Kaufman, Ph.D. Hand Delivered Deborah Glosser, Ph.D. U.S. Mail 2623 NW Bluebell Place Overnight Mail Corvallis, OR 97330 FAX FTP Site X Email lance aegisinsight.com deborah.glosser(cD_gmail.com Bayer Corporation Hand Delivered Ethan Waltermire U.S. Mail Ruveon LLC Overnight Mail P.O. Box 816 FAX Soda Springs, Idaho 83276 FTP Site X Email Ethan.waltermire(c)_bayer.com ERRATA TO ATTACHMENT NO. 11 TO PETITION - 4 Thomas J. Budge Hand Delivered Racine Olson, PLLP U.S. Mail P.O. Box 1391 Overnight Mail 201 E. Center FAX Pocatello, Idaho 83204 FTP Site X Email tj(a racineolson.com tessa racineolson.com Brian C. Collins Hand Delivered Greg Meyer U.S. Mail Brubaker & Associates Overnight Mail 16690 Swingley Ridge Rd., #140 FAX Chesterfield, MO 63017 FTP Site X Email bcollins _consultbai.com gmeyer consultbai.com City of Boise City Hand Delivered Ed Jewell U.S. Mail Deputy City Attorney Overnight Mail Boise City Attorney's Office FAX 150 N. Capitol Blvd. FTP Site P.O. Box 500 X Email Boise, Idaho 83701 BoiseCityAttorney�cityofboise.org elewell(a)_cityofboise.org Katie O'Neal Hand Delivered Energy Program Manager U.S. Mail Boise City Dept. of Public Works Overnight Mail 150 N. Capitol Blvd. FAX P.O. Box 500 FTP Site Boise, Idaho 83702-0500 X Email koneil cityofboise.org Clean Energy Opportunities for Idaho Hand Delivered Kelsey Jae U.S. Mail 521 E. 41 st Street, #506 Overnight Mail Garden City, Idaho 83714 FAX FTP Site X Email kelsey(a kelseyjae.com ERRATA TO ATTACHMENT NO. 11 TO PETITION - 5 Courtney White Hand Delivered Mike Heckler U.S. Mail Clean Energy Opportunities for Idaho Overnight Mail 3778 Plantation River Drive, Suite 102 FAX Boise, Idaho 83703 FTP Site X Email courtney(a cleanergyopportunities.com mike cleanenergyopportunities.com Federal Executive Agencies Hand Delivered Emily W. Medlyn U.S. Mail Jelani A. Freeman Overnight Mail U.S. Department of Energy FAX 1000 Independence Ave., S.W. FTP Site Washington, D.C. 20585 X Email Emily W. Medlyn Hand Delivered Jelani A. Freeman U.S. Mail U.S. Department of Energy Overnight Mail 1000 Independence Ave., S.W. FAX Washington, D.C. 20585 FTP Site X Email Emily.medlyn(a-).hg.doe.gov Jelani.freemanCa)_hg.doe.gov Dwight Etheridge Hand Delivered Exeter Associates, Inc. U.S. Mail 10480 Little Patuxent Parkway, Suite 300 Overnight Mail Columbia, MD 21044 FAX FTP Site X Email detheridge(cD_exeterassociates.com Industrial Customers of Idaho Power Hand Delivered c/or Peter J. Richardson U.S. Mail Richardson Adams, PLLC Overnight Mail 515 N. 27t" Street FAX Boise, Idaho 83702 FTP Site X Email peterCa)_richardsonadams.com ERRATA TO ATTACHMENT NO. 11 TO PETITION - 6 Micron Technology, Inc. Hand Delivered Austin Rueschhoff U.S. Mail Thorvald A. Nelson Overnight Mail Richard A. Arnett FAX Holland & Hart LLP FTP Site 555 17t" Street, Suite 3200 X Email Denver, CO 80202 darueschhoff(@hollandhart.com tnelson(c)_hollandhart.com raarnett _hollandhart.corn aclee(a)_hol land hart.corn tlfriel hol land hart.com Northwest Energy Coalition Hand Delivered Benjamin J. Otto U.S. Mail 1407 W Cottonwood Crt. Overnight Mail Boise, Idaho 83702 FAX FTP Site X Email Ben(aD_nwenergy.org lauren nwenergy.orq derek(c)-nwenergy.org (W�q� -- Christy Davenport Legal Administrative Assistant ERRATA TO ATTACHMENT NO. 11 TO PETITION - 7