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CPUC releases draft 2025 IRP inputs and assumptions, seeks informal comments by March 7
Summary
The California Public Utilities Commission staff released a draft "2025 Inputs and Assumptions" (INA) for the 2024–26 Integrated Resource Plan (IRP) cycle, described updates across modeling, resource potential and cost assumptions, and asked stakeholders for informal comments by March 7 to inform a May–June finalization.
The California Public Utilities Commission on a recorded Webex workshop presented a draft 2025 Inputs and Assumptions document that staff plans to use in modeling and analysis for the 2024–26 IRP cycle. Jared Ferguson, supervisor for the IRP planning and modeling team, opened the workshop and said staff is “seeking stakeholders’ informal comments, by March 7.”
The draft INA summarizes the data, assumptions and modeling methods staff will use to develop the 2026 Preferred System Plan and subsequent transmission planning portfolios. Ferguson said the document will be finalized in the May–June timeframe and that the workshop is intended to familiarize stakeholders with substantial updates and solicit informal feedback staff may incorporate into the final INA.
Why it matters: The INA establishes the baseline inputs — load forecasts, baseline and candidate resources, cost and financing assumptions, transmission and interconnection limits, and reliability accounting — that the CPUC’s resource-selection model (Resolve) and production-cost model (ServM) will use to evaluate least-cost portfolios. Changes in any of these inputs can materially affect which resources are selected in the IRP, the timing of procurement needs, and the commission’s recommendations to load-serving entities.
Key process notes from the workshop: - Staff asked stakeholders to submit informal comments to the IRP email address and to post them to the IRP service list to aid review. Ferguson noted the comments are informal and “will not be on the record of the proceeding.” - Workshop materials and the INA draft were posted to the CPUC’s 2024–26 IRP cycle webpage; staff also will post the full Q&A log after the workshop. - Staff reiterated the INA is being prepared while federal policy developments continue to evolve; if and when federal rules change materially, staff may model sensitivity scenarios or update the INA.
The workshop was roughly three-and-a-half hours and included presentations from CPUC staff and external consultants on zonal topology, baseline resources, candidate resources and costs, resource potential and land-use screening, transmission and interconnection, weather-based profiles, reliability accreditation (ELCC) and resource adequacy inputs. A short public-comment exchange closed the meeting.
Looking ahead: Staff intends to use the finalized INA for upcoming filing requirements next quarter and for development of the 2026 preferred system plan. Stakeholders wishing to request additional workshops or deeper technical sessions were asked to state that preference in written comments so staff can prioritize topics and scheduling.
Ending: Staff closed by saying they will continue to answer Q&A items and post answers to the IRP webpage within the next one to two business days.
