PacifiCorp 2025 Integrated Resource Plan Update
Summary
The Utah Public Service Commission posted PacifiCorp's 2025 Integrated Resource Plan Update filed March 31, 2026, in Docket No. 25-035-22. The docket contains the utility's redacted resource planning documentation along with public comments submitted from December 2025 through March 2026. This is a routine state regulatory proceeding for electric utility resource planning.
What changed
PacifiCorp filed its 2025 Integrated Resource Plan Update with the Utah Public Service Commission on March 31, 2026, under Docket No. 25-035-22. The filing includes a redacted version of the IRP and a highly confidential version. The docket shows extensive public comment activity throughout early 2026, indicating active stakeholder engagement in the review process.
The IRP is a long-term planning document that outlines how the utility intends to meet future electricity demand through various resource options including generation capacity, energy efficiency, and renewable resources. Utilities operating in Utah must file IRPs with the PSC for review. Compliance teams at PacifiCorp and interested stakeholders should monitor for the PSC's decision and any resulting requirements. Public comments have already been submitted, so the proceeding is in the review phase.
Source document (simplified)
Docket No: 25-035-22
Electric Docket Year: 2025
PacifiCorp’s 2025 Integrated Resource Plan
For questions regarding documents not linked call 801-530-6716
| Date | Description |
| --- | --- |
| March 31, 2026 | Cover Letter
Redacted PacifiCorp’s 2025 Integrated Resource Plan Update
PacifiCorp’s 2025 Integrated Resource Plan Update [HIGHLY CONFIDENTIAL]
|
| March 11, 2026 | Public Comments from March 11, 2026 |
| March 9, 2026 | Public Comments from March 9, 2026 |
| March 6, 2026 | Public Comments from March 6, 2026 |
| February 26, 2026 | Public Comments from February 26, 2026 |
| February 13, 2026 | Public Comments from February 13, 2026 |
| February 12, 2026 | Public Comments from February 12, 2026 |
| February 11, 2026 | Public Comments from February 11, 2026 |
| February 10, 2026 | Public Comments from February 10, 2026 |
| February 9, 2026 | Public Comments from February 9, 2026 |
| February 5, 2026 | Public Comments from February 5, 2026 |
| February 3, 2026 | Public Comments from February 3, 2026 |
| January 26, 2026 | Public Comments from January 26, 2026 |
| January 23, 2026 | Public Comments from January 23, 2026 |
| January 22, 2026 | Public Comments from January 22, 2026 |
| January 21, 2026 | Public Comments from January 21, 2026 |
| January 20, 2026 | Public Comments from January 20, 2026 |
| January 16, 2026 | Public Comments from January 16, 2026 |
| January 15, 2026 | Public Comments from January 15, 2026 |
| January 13, 2026 | Public Comments from January 13, 2026 |
| January 12, 2026 | Public Comments from January 12, 2026 |
| January 8, 2026 | Public Comments from January 8, 2026 |
| January 5, 2026 | Public Comments from January 5, 2026 |
| December 24, 2025 | Public Comments from December 24, 2025 |
| December 22, 2025 | Public Comments from December 22, 2025 |
| December 15, 2025 | Public Comments from December 15, 2025 |
| December 12, 2025 | Public Comments from December 12, 2025 |
| December 1, 2025 | Reporter’s Transcript, Re: October 29, 2025 Public Witness Hearing |
| November 25, 2025 | Reply Comments from the Division of Public Utilities |
| November 25, 2025 | PacifiCorp’s Reply Comments |
| November 25, 2025 | Joint Reply Comments of Utah Clean Energy & Southwest Energy Efficiency Project |
| November 25, 2025 | Reply Comments of Western Resource Advocates |
| November 25, 2025 | Sierra Club’s Reply Comments on PacifiCorp’s 2025 Integrated Resource Plan |
| November 24, 2025 | Public Comments from November 24, 2025 |
| November 18, 2025 | Public Comments from November 18, 2025 |
| November 17, 2025 | Public Comments from November 17, 2025 |
| November 13, 2025 | Public Comments from November 13, 2025 |
| November 6, 2025 | Public Comments from November 6, 2025 |
| November 3, 2025 | Public Comments from November 3, 2025 |
| October 29, 2025 | Public Comments from October 29, 2025 |
| October 29, 2025 | Recorded Live Stream of Public Witness Hearing Held on October 29, 2025
Sign-In Sheet for Public Witness Hearing Held on October 29, 2025 |
| October 28, 2025 | Public Comments from October 28, 2025 |
| October 27, 2025 | Public Comments from October 27, 2025 |
| October 23, 2025 | Public Comments from October 23, 2025 |
| October 21, 2025 | Public Comments from October 21, 2025 |
| October 20, 2025 | Public Comments from October 20, 2025 |
| October 15, 2025 | Order Granting Intervention of the Interwest Energy Alliance |
| October 14, 2025 | Public Comments from October 14, 2025 |
| September 26, 2025 | Comments of Utah Clean Energy |
| September 26, 2025 | Comments from the Office of Consumer Services |
| September 26, 2025 | Joint Comments of Utah Clean Energy & Southwest Energy Efficiency Project |
| September 26, 2025 | Comments from the Division of Public Utilities
DPU Attachment A – RMP DR Response Set 1 |
| September 26, 2025 | Initial Comments of the Utah Association of Energy Users
UAE Exhibit 1 – IRP Guidelines Order
UAE Exhibit 2 – Rocky Mountain Power’s Responses to Data Requests Referenced in UAE Comments |
| September 26, 2025 | Redacted Sierra Club’s Opening Comments on PacifiCorp’s 2025 Integrated Resource Plan
Sierra Club’s Opening Comments on PacifiCorp’s 2025 Integrated Resource Plan [CONFIDENTIAL]
Sierra Club Workpapers for Exhibit 1 |
| September 26, 2025 | Initial Comments of the Interwest Energy Alliance |
| September 26, 2025 | Interwest Energy Alliance’s Petition to Intervene and Notice of Appearance |
| September 26, 2025 | Initial Comments of Vote Solar |
| September 25, 2025 | Initial Comments of Western Resource Advocates
WRA Exhibit 1 – 2025 IRP First Feedback Form
WRA Exhibit 2 – Post-IRP Draft Corrections and Refinements
WRA Exhibit 3 – PacifiCorp’s Responses to WRA Data Requests
WRA Exhibit 4 – PacifiCorp’s Response to Sierra Club Data Request 2.2 |
| August 7, 2025 | Appendix A, Re: Sierra Goodridge for Utah Clean Energy |
| July 22, 2025 | Recorded Live Stream of Technical Conference Held on July 22, 2025 |
| July 21, 2025 | Rocky Mountain Power’s Presentation for the July 22, 2025 Technical Conference |
| July 3, 2025 | Office of Consumer Services’ Comments Regarding Technical Conference Agenda Proposed by Rocky Mountain Power |
| July 3, 2025 | Division of Public Utilities’ Comments on Proposed Agenda |
| July 3, 2025 | Utah Clean Energy’s Comments Regarding Technical Conference Agenda Proposed by PacifiCorp, Doing Business as Rocky Mountain Power |
| July 3, 2025 | Comments of the Utah Association of Energy Users Regarding Rocky Mountain Power’s Proposed Agenda for the July 22, 2025 Technical Conference |
| July 2, 2025 | Western Resource Advocates’ Comments Regarding RMP’s Proposed Technical Conference Agenda |
| June 24, 2025 | Rocky Mountain Power’s Proposed Agenda |
| June 10, 2025 | Order Granting Intervention of Utah Clean Energy |
| May 27, 2025 | Public Comments from May 27, 2025 |
| May 19, 2025 | Appendix A, Re: Laura Burford for Sierra Club |
| May 16, 2025 | Public Comments from May 16, 2025 |
| May 15, 2025 | Appendix A, Re: Jennifer Eden, Josh Craft, Kevin Emerson, Logan Mitchell, Sarah Wright, Jenn Bodine, and Lauren Barros for Utah Clean Energy |
| May 15, 2025 | Petition for Leave to Intervene of Utah Clean Energy |
| May 1, 2025 | Appendix A, Re: Matthew Gerhart for Sierra Club
Certificate of Service |
| April 28, 2025 | Order Granting Intervention of the Utah Association of Energy Users |
| April 28, 2025 | Order Granting Intervention of Sierra Club |
| April 28, 2025 | Order Granting Intervention of Western Resource Advocates |
| April 22, 2025 | Appendix A, Re: Stacy Tellinghuisen, Erin Overturf, and John Nielsen for Western Resource Advocates |
| April 21, 2025 | Appendix A, Re: Edward Burgess, Jordan Ahern, and Maria Roumpani for Sierra Club
Certificate of Service |
| April 16, 2025 | Scheduling Order, Notice of Technical Conference, and Notice of Public Witness Hearing |
| April 16, 2025 | Rocky Mountain Power’s 2025 Integrated Resource Plan Supporting Information
RMP Appendix A – Load Forecast
RMP Appendix D – Demand Side Management
RMP Appendix F – Flexible Reserve Study
RMP Appendix G – Plant Water Consumption Study
RMP Appendix H – Stochastic Methodology and Stimulation Results
RMP Appendix I – Capacity Expansion Results
RMP Appendix K – Capacity Contribution
RMP Appendix N – Energy Storage Potential Evaluation
RMP Appendix O – Washington Clean Energy Action Plan
RMP Appendix P – Oregon Clean Energy Update
RMP Chapter 1 – Executive Summary
RMP Chapter 5 – Reliability and Resiliency
RMP Chapter 6 – Load and Resource Balance
RMP Chapter 7 – Resource Options
RMP Chapter 8 – Modeling and Portfolio Evaluation
RMP Chapter 9 – Modeling and Portfolio Selection Results
RMP Chapter 10 – Action Plan
RMP Attachment 1 – Input Assumptions
RMP Attachment 2 – IR-LT
RMP Attachment 3 – IR-ST Cost Summary
RMP Attachment 4 – ItR-ST Cost Summary
RMP Attachment 5 – SR-ST Cost Summary
RMP Attachment 6 – File Mapping and Descriptions |
| April 15, 2025 | Appendix A, Re: Isaac Orr and Mitchell Rolling for the Utah Office of Energy Development |
| April 15, 2025 | Rocky Mountain Power’s 2025 Integrated Resource Plan Confidential and Highly Confidential Supporting Information
RMP Appendix A – Load Forecast [CONFIDENTIAL]
RMP Appendix F – Flexible Reserve Study [CONFIDENTIAL]
RMP Appendix H – Stochastic Parameters [CONFIDENTIAL]
RMP Appendix K – Capacity Contribution [CONFIDENTIAL]
RMP Appendix N – Energy Storage Potential Evaluation [CONFIDENTIAL]
RMP Appendix P – Oregon Clean Energy Update [CONFIDENTIAL]
RMP Chapter 1 – Executive Summary [CONFIDENTIAL]
RMP Chapter 6 – Load and Resource Balance [CONFIDENTIAL]
RMP Chapter 7 – Resource Options [CONFIDENTIAL]
RMP Chapter 9 – Modeling and Portfolio Selection Results [CONFIDENTIAL]
RMP Attachment 1 – Input Assumptions [CONFIDENTIAL]
RMP Attachment 2 – IR-Max.of.Units [CONFIDENTIAL]
RMP Attachment 3 – IR-ST Cost Summary [CONFIDENTIAL]
RMP Attachment 4 – ItR-25I.IR.iLT.r21.CETA [CONFIDENTIAL]
RMP Attachment 5 – ItR-25I.IR.iLT.r21.OR [CONFIDENTIAL]
RMP Attachment 6 – ItR-25I.IR.iLT.r21.System [CONFIDENTIAL]
RMP Attachment 7 – ItR-25I.IR.iLT.r21.UIWC [CONFIDENTIAL]
RMP Attachment 8 – IR-ST Cost Summary [HIGHLY CONFIDENTIAL]
RMP Attachment 9 – ItR-ST Cost Summary [HIGHLY CONFIDENTIAL]
RMP Attachment 10 – SR-ST Cost Summary [HIGHLY CONFIDENTIAL]
RMP Attachment 11 – File Mapping and Descriptions [CONFIDENTIAL]
RMP Attachment 12 – File Mapping and Descriptions [HIGHLY CONFIDENTIAL]
|
| April 11, 2025 | Appendix A, Re: Don Hendrickson and Phillip Russell for the Utah Association of Energy Users |
| April 11, 2025 | Petition to Intervene of the Utah Association of Energy Users |
| April 11, 2025 | Appendix A, Re: Rose Monahan and Thomas Phillips for Sierra Club |
| April 11, 2025 | Sierra Club’s Petition to Intervene |
| April 10, 2025 | Appendix A, Re: Sophie Hayes, Karl Boothman, Jessica Loeloff, Nancy Kelly, and Gwen Farnsworth for Western Resource Advocates |
| April 10, 2025 | Petition for Leave to Intervene of Western Resource Advocates |
| April 7, 2025 | Public Comments from April 7, 2025 |
| April 2, 2025 | Appendix A, Re: Cindi Eckhardt for the Utah Office of Energy Development |
| April 2, 2025 | Notices of Filing and Virtual Scheduling Conference |
| March 31, 2025 | Rocky Mountain Power’s Cover Letter
2025 Integrated Resource Plan Volume I
2025 Integrated Resource Plan Volume II |
Share this:
Named provisions
Related changes
Source
Classification
Who this affects
Taxonomy
Browse Categories
Get Energy alerts
Weekly digest. AI-summarized, no noise.
Free. Unsubscribe anytime.
Get alerts for this source
We'll email you when psc.utah.gov publishes new changes.