The California ISO 2024-2025 transmission planning cycle involves key stakeholder activities from 2024 through early 2025. 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.
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May 29, 2025 Board-approved transmission plan posted
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May 22, 2025 ISO Board of Governors approval
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List of Qualified Applicants - Manning - Metcalf 500kV Transmission Line Project |
https://stakeholdercenter.caiso.com/InitiativeDocuments/List-of-Qualified-Applicants-Manning-Metcalf-500kV-Transmission-Line-Project.pdf
List of Qualified Applicants - Manning - Metcalf 500kV Transmission Line Project 01/29/2026
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https://stakeholdercenter.caiso.com/InitiativeDocuments/ListofQualifiedApplicants-NRS-SanJoseB230kVLineProject.pdf
List of Qualified Applicants - NRS - San Jose B 230kV Line Project 01/08/2026
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https://stakeholdercenter.caiso.com/InitiativeDocuments/List-of-Validated-Project-Sponsor-Applications-Manning-Metcalf-500kV-Transmission-Line-Project.pdf
List of Validated Project Sponsor Applications - Manning - Metcalf 500kV Transmission Line Project 12/09/2025
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https://stakeholdercenter.caiso.com/InitiativeDocuments/List-of-Validated-Project-Sponsor-Applications-NRS-San-Jose-B-230kV-Transmission-Line-Project.docx
List of Validated Project Sponsor Applications - NRS San Jose B 230kV Transmission Line Project 11/14/2025
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https://stakeholdercenter.caiso.com/InitiativeDocuments/AB-2779-Grid-Enhancing-Technologies-Report-2024-2025-Transmission-Planning-Process.pdf
AB 2779 Grid Enhancing Technologies Report - 2024-2025 Transmission Planning Process 08/04/2025
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https://stakeholdercenter.caiso.com/InitiativeDocuments/2024-2025-Transmission-Planning-Process-Phase-3-Sequence-Schedule.pdf
2024-2025 Transmission Planning Process - Phase 3 Sequence Schedule 07/18/2025
2024-2025 Competitive Solicitation Questions Matrix R1 07/18/2025
2024-2025 Competitive Solicitation Questions Matrix R2 07/29/2025
2024-2025 Competitive Solicitation Questions Matrix R3 08/29/2025
2024-2025 Competitive Solicitation Questions Matrix R4 08/29/2025
2024-2025 Competitive Solicitation Questions Matrix R5 09/15/2025
2024-2025 Competitive Solicitation Questions Matrix R6 09/15/2025
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Web meeting |
https://youtu.be/wzoQMUE8RwM
Video - 2024-2025 Transmission Planning Process Phase 3 - Competitive Solicitation - Jun 25, 2025 06/30/2025
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https://stakeholdercenter.caiso.com/InitiativeDocuments/2024-2025-Competitive-Solicitation-Questions-Matrix-R0.pdf
2024-2025 Competitive Solicitation Questions Matrix R1 07/07/2025
Competitive Solicitation Transmission Project Sponsor Application 06/23/2025
Cost and Cost Containment Workbook 06/23/2025
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https://stakeholdercenter.caiso.com/InitiativeDocuments/KeySelectionFactors-2024-2025TransmissionPlanningProcess.pdf
Key Selection Factors - 2024-2025 Transmission Planning Process 06/11/2025
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https://stakeholdercenter.caiso.com/InitiativeDocuments/BoardApproved-2024-2025-TransmissionPlan.pdf
Board Approved - 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix A 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix B 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix C 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix D 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix E 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix F 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix G 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix H 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix I 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix J 2024-2025 Transmission Plan 05/29/2025
Board Approved - Appendix K 2024-2025 Transmission Plan 05/29/2025
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https://stakeholdercenter.caiso.com/InitiativeDocuments/Revised-Draft-2024-2025-TransmissionPlan.pdf
Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix A - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix B - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix C - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix D - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix E - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix F - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix G - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix H - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix I - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix J - Revised Draft 2024-2025 Transmission Plan 05/14/2025
Appendix K - Revised Draft 2024-2025 Transmission Plan 05/14/2025
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-2024-2025TransmissionPlanningProcess-Apr15-2025.pdf
Presentation - 2024-2025 Transmission Planning Process - Apr 15, 2025 04/11/2025
Draft 2024-2025 Transmission Plan 03/31/2025
Appendix A - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix B - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix C - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix D - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix E - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix F - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix G - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix H - Draft 2024-2025 Transmission Plan 03/31/2025
Appendix I - Draft 2024-2025 Transmission Plan 03/31/2025
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/ISO-Responses-Stakeholder-Comments-2024-Dec-9.pdf
ISO Responses Stakeholder Comments - Dec 09, 2024 03/21/2025
Presentation - 2024-2025 Transmission Planning Process Long-term LCR - Dec 09, 2024 12/05/2024
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/ISOResponsestoComments-2024-2025TransmissionPlanningProcess-Nov13-2024.pdf
ISO Responses to Comments - 2024-2025 Transmission Planning Process - Nov 13, 2024 04/15/2025
Presentation - 2024-2025 Transmission Planning Process - Nov 13, 2024 11/11/2024
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Final Reliability Assessment Results https://stakeholdercenter.caiso.com/InitiativeDocuments/High-Voltage-2024-2025-Transmission-Planning-Process-Final-Reliability-Assessment-Results.pdf
High Voltage 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
HUMBOLDT 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
KERN 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
NCNB 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
NVLY 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
SCE BC 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
SCE MAIN 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
SDGE 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
VEA 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
BULK PG&E 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
BULK SOUTHERN 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
CCLP 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
CVLY 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
FRESNO 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
GBA 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
NOL 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
SCE Eastern 2024-2025 Transmission Planning Process Final Reliability Assessment Results 10/31/2024
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/ISOResponsestoComments-2024-2025TransmissionPlanningProcess-Sep2324-2024.pdf
ISO Responses to Comments - 2024-2025 Transmission Planning Process - Sep 23-24, 2024 04/15/2025
Presentation - 2024-2025 Transmission Planning Process - Sep 24, 2024 09/20/2024
VEA - 2024-2025 Transmission Planning Process Presentation - Sep 24, 2024 09/20/2024
SDGE - 2024-2025 Transmission Planning Process Presentation - Sep 24, 2024 09/20/2024
SCE - 2024-2025 Transmission Planning Process Presentation - Sep 24, 2024 09/20/2024
PG&E - 2024-2025 Transmission Planning Process Presentation - Sep 24, 2024 09/20/2024
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-2024-2025-Transmission-Planning-Process-Sep-23-2024.pdf
Presentation - 2024-2025 Transmission Planning Process - Sep 23, 2024 09/19/2024
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https://www.caiso.com/generation-transmission/transmission/transmission-planning#planning-engagement
2024-2025 Request Window (closes Oct 15, 2024) 08/19/2024
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Preliminary Reliability Assessment Results https://stakeholdercenter.caiso.com/InitiativeDocuments/VEA-2024-2025-Transmission-Planning-Process-Preliminary-Assessment-Results.pdf
VEA - 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/14/2024
Teh Big Creek 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
Southern Bulk 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
SDGE 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
SCE Main 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
SCE Eastern 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
North Valley 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
Northern Bulk 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
NOL 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
NCNB 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
Kern 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
Humboldt 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
High Voltage 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
Greater Bay 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
Fresno 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
Central Valley 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
CCLP 2024-2025 Transmission Planning Process Preliminary Assessment Results 08/15/2024
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https://stakeholdercenter.caiso.com/InitiativeDocuments/Final-Study-Plan-2024-2025-Transmission-Planning-Process.pdf
Final Study Plan - 2024-2025 Transmission Planning Process 06/26/2024
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-2024-2025-Transmission-Planning-Process-Feb28-2024.pdf
Presentation - 2024-2025 Transmission Planning Process - Feb 28, 2024 02/27/2024
ISO Responses to Comments - 2024-2025 Transmission Planning Process - Feb 28, 2024 01/06/2025
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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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https://stakeholdercenter.caiso.com/InitiativeDocuments/Draft-Study-Plan-2024-2025-Transmission-Planning-Process.pdf
Draft Study Plan - 2024-2025 Transmission Planning Process 02/21/2024
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Stakeholder comment period for 2024-2025 unified planning assumptions and study plan is Dec 28, 2023 through Jan 29, 2024. See the notice for more information. https://www.caiso.com/Documents/stakeholder-input-for-2024-2025-unified-planning-assumptions.html
Link to Dec 28, 2023 notice 12/28/2023
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