2021-2022 Transmission planning process

Started: Feb 18, 2021

Jeff Billinton

The California ISO 2021-2022 transmission planning cycle involves key stakeholder activities from 2021 through early 2022. Each year, the ISO conducts its transmission planning process to identify potential system limitations as well as opportunities for system reinforcements that improve reliability and efficiency. The transmission planning process core product is the ISO Transmission Plan, which provides an evaluation of the ISO control grid, examines conventional grid reliability requirements and projects, summarizes key collaborative activities and provides details on key study areas and associated findings.


Development Decision Implementation Completed/Closed
Phase 1
Mar 31, 2021 Final study plan posted

Phase 2
Aug 13, 2021* Preliminary reliability study results posting
Sep 27-28, 2021* Meeting
Oct 12, 2021* Comments due


Phase 1 - develop study plan

In collaboration with stakeholders, the ISO develops and finalizes a study plan that consists of a common set of assumptions for reliability and other planning studies the ISO will perform in Phase 2. The development of a conceptual statewide transmission plan begins in this phase and may be completed during Phase 1 or Phase 2. Stakeholders may also request economic planning studies to assess potential economic benefits (such as congestion relief) in specific areas of the grid.

Final study plan

Final 2021-2022 Study Plan

Web meeting

Draft 2021-2022 Study Plan

Agenda - 2021-2022 Transmission planning Process - Feb 25, 2021

Presentation - 2021-2022 Transmission Planning Process - Feb 25, 2021