This initiative will address the California ISO’s compliance with FERC Order No. 881 in establishing new transmission line rating requirements.
| Proposal Development | Decision | Implementation | Completed/Closed | |
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| Phase 2 |
Apr 30, 2025 FERC approval of implementation delay (ER22-2362)
Jun 16, 2023 Compliance Filing (ER22-2362) |
Apr 01, 2024 - track 1
Implementation milestones
Q4 2024 - track 2 |
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| Phase 1 |
Jun 23, 2022 Revised draft tariff language posted
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Apr 20, 2023 FERC approval (ER22-2362)
Jul 12, 2022 Compliance filing (ER22-2362) |
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Through Phase 2 of this initiative, the ISO will coordinate with participating transmission owners, WEIM entities, market participants, and RC West customers to address implementation issues and milestones associated with new transmission line rating requirements under Order No. 881.
Web meeting |
https://youtu.be/VfNIWTVFWc0
Video - FERC Order No. 881 - Aug 18, 2025 09/03/2025
Presentation - FERC - Order - No. 881 Implementation - Aug 18, 2025 08/18/2025
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BRS review - comments due |
https://www.caiso.com/documents/ferc-881-track-3-business-requirements-specification.pdf
Business Requirements Specification - FERC Order 881 Track 3 06/30/2025
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation - FERC Order No. 881 Implementati- Apr 8, 2025.pdf
Presentation - FERC Order No. 881 Implementation - Apr 08, 2025 04/08/2025
Video - FERC Order No. 881 - Apr 08, 2025 04/22/2025
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BRS Comments |
https://www.caiso.com/documents/business-requirements-specification-ferc-881-track-2-v2-0.pdf
Business Requirements Specification FERC 881 Track 2 v2.0 04/07/2025
CAISO Responses to FERC 881 Track 2 Business Requirements Specifications Stakeholder Comments 05/07/2025
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View comments |
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https://stakeholdercenter.caiso.com/InitiativeDocuments/2025-Draft-Redline-Tariff-Language-FERC-Order-No-881-Feb-4-2025.docx
2025 Draft Redline Tariff Language - FERC Order No. 881 - Feb 4, 2025 02/04/2025
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Training |
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-and-Implementation-Forum-information-FERC-Order-No-881-Jan-24-2025.pdf
Presentation and Implementation Forum Information - FERC Order No. 881 - Jan 24, 2025 01/23/2025
Response to Stakeholder Questions - FERC Order No. 881 - Jan-24-2025 02/18/2025
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERC-Order-No-881-Dec-16-2024.pdf
Presentation - FERC Order No. 881 - Dec 16, 2024 12/13/2024
Video - FERC Order No. 881 Compliance - Dec 16, 2024 12/24/2024
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https://stakeholdercenter.caiso.com/InitiativeDocuments/2024NewDraftRedlineTariffLanguageFERCOrderNo881.docx
Revised Redline Draft Tariff Language - FERC Order No 881 - Dec 05, 2024 12/05/2024
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View comments |
Web meeting |
https://youtu.be/2cfCTJSdrwU
Video - FERC Order 881 - Managing Transmission Line Ratings (Methodologies) - Oct 24, 2024 10/30/2024
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View comments |
Web meeting |
https://youtu.be/e-91gUGEqLc https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERC-Order-881-Managing-Transmission-Line-Ratings-Phase-2-07-30-2024-Data-Submission-Working-Group (1).pdf | |
Web meeting |
https://youtu.be/6kpkIEpDIdI
Video - FERC Order 881 - Managing Transmission Line Ratings (Methodologies) - Jul 23, 2024 07/25/2024
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Web meeting |
https://www.youtube.com/watch?v=WYkEpielABE https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERCOrder881-ManagingTransmissionLineRatings-Phase2-DataSubmissionWorkingGroup-Apr24-2024.pdf | |
Web meeting |
https://youtu.be/YMfOMYYDy_M https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERCOrder881-ManagingTransmissionLineRatings-Phase2-Quarterly_InitiativeUpdate-Jan18-2024.pdf | |
Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERCOrder881-ManagingTransmissionLineRatings-Phase2-DataSubmissionWorkingGroup-Oct2-2023.pdf
Presentation - FERC Order 881 - Managing Transmission Line Ratings - Phase 2 - Oct 2, 2023 10/02/2023
Video - FERC Order 881 - Managing Transmission Line Ratings - Phase 2 - Oct 2, 2023 10/04/2023
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Templates |
https://stakeholdercenter.caiso.com/InitiativeDocuments/DraftDataSubmissionTemplate-FERCOrder881-ManagingTransmissionLineRatingsPhase2.xlsx
Draft Data Submission Template - FERC Order 881 - Managing Transmission Line Ratings Phase 2 08/17/2023
Example Data Submission Template - FERC Order 881 - Managing Transmission Line Ratings Phase 2 08/17/2023
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Web meeting |
https://youtu.be/1K07Gs-2XOI
https://stakeholdercenterpub.oa.caiso.com/InitiativeDocuments/DraftDataSubmissionTemplate-FERCOrder881-ManagingTransmissionLineRatingsPhase2.xlsx
Draft Data Submission Template - FERC Order 881 - Managing Transmission Line Ratings Phase 2 09/07/2023
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERCOrder881-ManagingTransmissionLineRatings-Phase2-DataSubmissionWorkingGroup-Jul13-2023.pdf | |
Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERCOrder881-ManagingTransmissionLineRatings-Phase2-QuarterlyInitiativeUpdate-May11-2023.pdf | |
Web meeting |
https://youtu.be/9S-o-Z6oXrc
Video - FERC Order No. 881 - Managing Transmission Line Ratings - Phase 2 - Apr 13, 2023 04/14/2023
Technical White Paper - FERC Order 881 - Managing Transmission Line Ratings Phase 2 04/07/2023
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View comments |
Web meeting |
https://youtu.be/aG8B5dSd9Bc
Video - FERC Order No. 881 - Managing Transmission Line Ratings - Phase 2 - Feb 14, 2023 02/17/2023
Presentation - FERC Order 881 - Managing Transmission Line Ratings - Phase 2 - Feb 14, 2023 02/13/2023
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Web meeting |
https://youtu.be/BYq9eAHg6A0 https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERCOrder881-ManagingTransmissionLineRatings-Phase2-DataSubmissionWorkingGroup-Feb6-23.pdf | View comments |
Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/Presentation-FERCOrder881-ManagingTransmissionLineRatings-Phase2-Dec21-22.pdf
Presentation - FERC Order 881 - Managing Transmission Line Ratings - Phase 2 - Dec 21, 2022 12/21/2022
Video - FERC Order No. 881 – Managing Transmission Line Ratings Phase 2 - Dec 21, 2022 12/22/2022
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View comments |
This initiative will address the California ISO’s compliance with FERC Order No. 881 in establishing new transmission line rating requirements.
Filing |
http://www.caiso.com/Documents/Apr20-2023-OrderAcceptingComplianceFiling-regarding-FERCOrder881-ER22-2362.pdf
Apr 20, 2023 Order Accepting Compliance Filing regarding FERC Order No. 881 (ER22-2362) 04/24/2023
Jul 12, 2022 - Compliance Filing - FERC Order No. 881 (ER-22-2362) 11/16/2022
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https://stakeholdercenter.caiso.com/InitiativeDocuments/RevisedDraftTariffLanguage-FERCOrderNo881ManagingTransmissionLineRatings.docx
Revised Draft Tariff Language - FERC Order No. 881 Managing Transmission Line Ratings 06/23/2022
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Web meeting |
https://stakeholdercenter.caiso.com/InitiativeDocuments/DraftTariffLanguage-FERCOrderNo881ManagingTransmissionLineRatings.docx
Draft Tariff Language - FERC Order No. 881 Managing Transmission Line Ratings 05/20/2022
Presentation - FERC Order No. 881 Managing Transmission Line Ratings 05/20/2022
Video - FERC Order No. 881 Managing Transmission Line Ratings - May 24, 2022 05/25/2022
ISO Response to Comments Matrix - FERC Order No. 881 Managing Transmission Line Ratings 05/20/2022 06/23/2022
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View comments |