Skip Ribbon Commands
Skip to main content
Sign In
Home > Planning > Transmission Planning > 2020-2021 Transmission Planning Process

2020-2021 transmission planning process

The California ISO 2020-2021 transmission planning cycle involves key stakeholder activities from 2020 through early 2021. 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.


Process status

Phase 2: in progress
Phase 1: Final Study Plan - revised June 22, 2020


Current meeting


Phase 2 - conduct technical studies and develop comprehensive plan

The ISO performs technical studies, and with stakeholders develops an annual comprehensive transmission plan that examines the ISO controlled grid and reliability requirements and identifies mitigation solutions. Transmission mitigation solutions may meet reliability, economic or public policy-driven needs that support state, federal, municipal and county policy requirements and directives.


Reliability assessment

Special studies

Policy-driven and economic assessment

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.