The California ISO 2023-2024 transmission planning cycle involves key stakeholder activities from 2023 through early 2024. 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 |
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Apr 1, 2024* Draft transmission plan posting
Apr 09, 2024* Meeting Apr 23, 2024* Comments due May 2024* Board of Governors meeting |
Letter |
Letter - Project Cost Update for GLW-VEA Area Upgrades and Beatty 230 kV Projects - Nov 14, 2023 01/02/2024
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Web meeting |
Presentation - 2023-2024 Transmission Planning Process - Nov 16, 2023 11/14/2023
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Web meeting |
ISO Responses to Comments - 2023-2024 Transmission Planning Process - Sep 26-27, 2023 11/27/2023
CAISO Presentation - 2023-2024 Transmission Planning Process - Sep 27, 2023 09/22/2023
GLW Presentation - 2023-2024 Transmission Planning Process - Sep 27, 2023 09/22/2023
PG&E Presentation - 2023-2024 Transmission Planning Process - Sep 27, 2023 09/22/2023
SCE Presentation - 2023-2024 Transmission Planning Process - Sep 27, 2023 09/26/2023
SDGE Presentation - 2023-2024 Transmission Planning Process - Sep 27, 2023 09/22/2023
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Web meeting |
Agenda - 2023-2024 Transmission Planning Process - Sep 26-27, 2023 09/22/2023
CAISO Presentation - 2023-2024 Transmission Planning Process - Sep 26, 2023 09/22/2023
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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.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. |
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Reliability assessment
Link to 2023-2024 Preliminary Reliability Assessment Results.zip 12/20/2023
2023-2024 Preliminary Reliability Assessment Results 08/18/2023
2023-2024 Final Reliability Results 10/31/2023
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Final Study Plan - 2023-2024 Transmission Planning Process 08/16/2023
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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. |
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Web meeting |
Presentation - 2023-2024 Transmission Planning Process - Jun 28, 2023 06/27/2023
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Web meeting |
ISO Responses to Comments – 2023-2024 Transmission Planning Process – Feb 28, 2023 11/20/2023
Draft Study Plan - 2023-2024 Transmission Planning Process - Feb 28, 2023 02/23/2023
Presentation - 2023-2024 Transmission Planning Process - Feb, 28, 2023 02/27/2023
Agenda - 2023-2024 Transmission Planning Process - Feb, 28, 2023 02/27/2023
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