Tariff

The California ISO operates under the terms and conditions of its FERC-approved tariff, which is modified, amended, supplemented or restated as needed. Each section or appendix of the tariff is maintained and updated independently according to effective dates of the FERC accepted tariff amendments.

If a provision of an existing ISO contract, business practice manual or operating procedure conflicts with it, the tariff will prevail to the extent of the inconsistency.

Current combined tariff

Website Notes as of Feb 10, 202502/10/2025, 10:34 AM
Table of Contents as of Feb 5, 202502/10/2025, 9:05 AM
Conformed Tariff as of Feb 5, 202502/10/2025, 9:05 AM

Tariff sections

Title	Type	Posted
Section 1 - Definitions and Interpretation as of Feb 28, 2011	Tariff	12/05/2023, 10:16 AM
Section 2 - Access to the California ISO Controlled Grid as of Jun 28, 2010	Tariff	03/21/2018, 1:56 PM
Section 3 - Local Furnishing Other Tax Exempt Bond Facility Financing as of Jun 28, 2010	Tariff	03/21/2018, 1:57 PM
Section 4 - Roles and Responsibilities as of Nov 1, 2024	Tariff	12/18/2024, 10:57 AM
Section 5 - Black Start and System Restoration as of Sep 9, 2020	Tariff	09/14/2020, 3:04 PM
Section 6 - Communications as of Aug 3, 2024	Tariff	12/17/2024, 11:31 AM
Section 7 - System Operations Under Normal and Emergency Conditions as of Oct 14, 2024	Tariff	10/16/2024, 8:06 AM
Section 8 - Ancillary Services as of Aug 3, 2024	Tariff	12/17/2024, 11:31 AM
Section 9 - Outages as of Nov 1, 2023	Tariff	11/07/2023, 2:46 PM
Section 10 - Metering as of Jan 6, 2025	Tariff	01/10/2025, 10:59 AM
Section 11 - California ISO Settlements and Billing as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Section 12 - Creditworthiness as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Section 13 - Dispute Resolution as of Jan 1, 2021	Tariff	01/05/2021, 8:06 AM
Section 14 - Uncontrollable Force, Indemnity, Liabilities, and Penalties as of Sep 9, 2020	Tariff	09/16/2020, 8:10 AM
Section 15 - Regulatory Filings as of Jun 28, 2010	Tariff	03/21/2018, 1:53 PM
Section 16 - Existing Contracts as of Dec 21, 2023	Tariff	04/05/2024, 12:40 PM
Section 17 - Transmission Ownership Rights (TORs) as of Aug 12, 2019	Tariff	08/22/2019, 8:37 AM
Section 18 - Not Used as of Jun 28, 2010	Tariff	03/21/2018, 1:47 PM
Section 19 - Reliability Coordinator as of Sep 9, 2020	Tariff	09/16/2020, 8:10 AM
Section 20 - Confidentiality as of Jul 26, 2024	Tariff	07/29/2024, 4:13 PM
Section 21 - Not Used as of Jun 28, 2010	Tariff	03/21/2018, 2:00 PM
Section 22 - Miscellaneous as of Jan 6, 2025	Tariff	01/10/2025, 10:59 AM
Section 23 - Categories of Transmission Capacity as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Section 24 - Comprehensive Transmission Planning Process as of Dec 21, 2023	Tariff	04/05/2024, 12:40 PM
Section 25 - Interconnection of Generating Units and Facilities as of Dec 17, 2024	Tariff	12/18/2024, 11:50 AM
Section 26 - Transmission Rates and Charges as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Section 27 - California ISO Markets and Processes as of Aug 3, 2024	Tariff	12/17/2024, 11:31 AM
Section 28 - Inter-Scheduling Coordinator Trades as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Section 29 - Energy Imbalance Market as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Section 30 - Bid and Self-Schedule Submission in California ISO Markets as of Jan 24, 2025	Tariff	04/04/2025, 11:40 AM
Section 31 - Day-Ahead Market as of Jun 1, 2024	Tariff	06/18/2024, 9:43 AM
Section 32 - Not Used as of Jun 28, 2010	Tariff	03/21/2018, 1:53 PM
Section 33 - Extended Day-Ahead Market as of Aug 3, 2024	Tariff	12/17/2024, 11:31 AM
Section 34 - Real-Time Market as of Oct 14, 2024	Tariff	12/18/2024, 10:57 AM
Section 35 - Market Validation and Price Correction Nov 29, 2022	Tariff	12/20/2022, 9:06 AM
Section 36 - Congestion Revenue Rights as of Aug 3, 2024	Tariff	12/18/2024, 10:57 AM
Section 37 - Rules of Conduct as of Jan 6, 2025	Tariff	01/10/2025, 10:59 AM
Section 38 - Market Monitoring as of Jun 28, 2010	Tariff	03/21/2018, 1:47 PM
Section 39 - Market Power Mitigation Procedures as of Aug 1, 2024	Tariff	09/10/2024, 11:59 AM
Section 40 - RA Demonstration for Scheduling Coordinators in the CAISO Balancing Authority Area as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Section 41 - Procurement of Reliability Must-Run Resources as of Feb 11, 2023	Tariff	02/17/2023, 8:01 AM
Section 42 - Adequacy of Facilities to Meet Applicable Reliability Criteria as of Aug 12, 2019	Tariff	08/22/2019, 8:37 AM
Section 43 - Not Used as of Aug 12, 2019	Tariff	12/28/2022, 8:29 AM
Section 43A - Capacity Procurement Mechanism as of Jun 1, 2024	Tariff	06/14/2024, 1:49 PM
Section 44 - Flexible Ramping Product as of Feb 1, 2023	Tariff	02/01/2023, 9:17 AM
No results

View previous Tariff sections.

Current tariff appendices A - Z

Title	Type	Posted
Appendix A - Master Definition Supplement as of Feb 5, 2025	Tariff	02/07/2025, 11:47 AM
Appendix B.1 - Scheduling Coordinator Agreement as of Jun 12, 2013	Tariff	03/21/2018, 1:52 PM
Appendix B.2 - Participating Generator Agreement as of Jun 12, 2013	Tariff	03/21/2018, 1:49 PM
Appendix B.3 - Net Scheduled Participating Generator Agreement as of Sep 09, 2020	Tariff	09/18/2020, 9:04 AM
Appendix B.4 - Participating Load Agreement as of Jun 12, 2013	Tariff	03/21/2018, 1:59 PM
Appendix B.5 - Dynamic Scheduling Agreement for Scheduling Coordinators as of Jun 12, 2013	Tariff	03/21/2018, 2:02 PM
Appendix B.6 - Meter Service Agreement for California ISO Metered Entities as of Jun 12, 2013	Tariff	03/21/2018, 1:48 PM
Appendix B.7 - Meter Service Agreement for Scheduling Coordinators as of Jun 12, 2013	Tariff	03/21/2018, 1:50 PM
Appendix B.8 - Utility Distribution Company Operating Agreement as of Jun 12, 2013	Tariff	03/21/2018, 1:57 PM
Appendix B.9 - Dynamic Scheduling Host Balancing Authority Operating Agreement as of Sep 9, 2020	Tariff	09/18/2020, 9:04 AM
Appendix B.10 - Small Utility Distribution Co. Operating Agreement as of Feb 11, 2023	Tariff	02/17/2023, 10:30 AM
Appendix B.11 - Congestion Revenue Rights Entity Agreement as of Sep 9, 2020	Tariff	09/18/2020, 9:04 AM
Appendix B.12 - Metered Subsystem Aggregator Congestion Revenue Right Entity Agreement as of Jun 12, 2013	Tariff	03/21/2018, 1:49 PM
Appendix B.13 - Resource-Specific System Resource Agreement as of Sep 9, 2020	Tariff	09/18/2020, 9:04 AM
Appendix B.14 - Demand Response Provider Agreement as of Sep 9, 2020	Tariff	09/18/2020, 9:04 AM
Appendix B.15 - Convergence Bidding Entity Agreement as of Jun 12, 2013	Tariff	03/21/2018, 1:57 PM
Appendix B.16 - Pseudo-Tie Participating Generator Agreement as of Jan 30, 2021	Tariff	02/02/2021, 4:23 PM
Appendix B.17 - EIM Entity Agreement as of Sep 9, 2020	Tariff	09/18/2020, 9:04 AM
Appendix B.18 - EIM Entity Scheduling Coordinator Agreement as of Jul 1, 2014	Tariff	03/21/2018, 1:57 PM
Appendix B.19 EIM Participating Resource Agreement as of Aug 3, 2024	Tariff	12/17/2024, 11:30 AM
Appendix B.20 - EIM Participating Resource Scheduling Coordinator Agreement as of Jul 1, 2014	Tariff	03/21/2018, 1:48 PM
Appendix B.21 - Distributed Energy Resource Provider Agreement as of Jun 16, 2022	Tariff	09/16/2024, 10:49 AM
Appendix B.22 - Reliability Coordinator Service Agreement as of Nov 15, 2018	Tariff	11/15/2018, 4:45 PM
Appendix B.23 - CAISO as an Affected System Study Agreement (CASSA) as of Mar 28, 2023	Tariff	04/11/2023, 8:57 AM
Appendix B.24 - EIM Sub-Entity Implementation Agreement as of Apr 1, 2022	Tariff	04/15/2022, 12:37 PM
Appendix B.25 - EIM Sub-Entity Agreement as of Apr 1, 2022	Tariff	04/15/2022, 10:45 AM
Appendix B.26 - EIM Sub-Entity Scheduling Coordinator Agreement as of Apr 1, 2022	Tariff	04/15/2022, 10:45 AM
Appendix B.27 - EDAM Addendum to EIM Entity Agreement as of Dec 21, 2023	Tariff	12/21/2023, 2:57 PM
Appendix B.28 - EDAM Addendum to EIM Entity Scheduling Coordinator Agreement as of Dec 21, 2023	Tariff	12/21/2023, 2:57 PM
Appendix B.29 - EDAM Addendum to EIM Participating Resource Agreement as of Dec 21, 2023	Tariff	05/06/2024, 8:36 AM
Appendix B.30 - EDAM Addendum to EIM Participating Resource Schedule Coordinator Agreement as of Dec 21, 2023	Tariff	12/21/2023, 2:57 PM
Appendix B.31 - EDAM Entity Implementation Agreement as of Dec 21, 2023	Tariff	12/21/2023, 2:57 PM
Appendix B.32 - EDAM Load Serving Entity Agreement as of Dec 23, 2023	Tariff	12/21/2023, 2:57 PM
Appendix B.33 - EDAM Transmission Service Provider Agreement as of Dec 21, 2023	Tariff	12/21/2023, 2:57 PM
Appendix C - Locational Marginal Price as of Feb 1, 2023	Tariff	02/01/2023, 9:17 AM
Appendix D - Black Start Generating Units as of Nov 1, 2017	Tariff	03/21/2018, 1:51 PM
Appendix E - Submitted Ancillary Services Data Verification as of May 1, 2014	Tariff	03/21/2018, 1:53 PM
Appendix F - Rate Schedules as of Aug 3, 2024	Tariff	12/17/2024, 11:30 AM
Appendix G - Pro Forma Reliability Must Run Contract as of Feb 15, 2021	Tariff	02/19/2021, 8:32 AM
Appendix H - Legacy Reliability Must-Run Contract Provisions (including Legacy RMR contract) as of Sep 28, 2019	Tariff	06/15/2023, 8:55 AM
Appendix I - Station Power Protocol as of May 1, 2014	Tariff	03/21/2018, 2:02 PM
Appendix J - Grandfathered Standard Capacity Product Provisions as of Jun 30, 2021	Tariff	09/02/2021, 8:23 AM
Appendix K - Ancillary Service Requirements Protocol as of Aug 3, 2024	Tariff	12/17/2024, 11:30 AM
Appendix L-1 - Method to Assess Available Transfer Capability as of Aug 3, 2024	Tariff	12/17/2024, 11:30 AM
Appendix L - Not Used as of Jun 1, 2024	Tariff	06/18/2024, 9:43 AM
Appendix M - Dynamic Scheduling Protocol (DSP) as of Nov 6, 2018	Tariff	11/07/2018, 10:16 AM
Appendix N - Pseudo-Tie Protocols as of Jan 30, 2021	Tariff	02/02/2021, 3:33 PM
Appendix O - California ISO Market Surveillance Committee as of April 20, 2011	Tariff	03/21/2018, 1:49 PM
Appendix P - California ISO Department of Market Monitoring as of Jan 6, 2025	Tariff	01/10/2025, 10:59 AM
Appendix Q - Eligible Intermittent Resources Protocol (EIRP) as of Nov 1, 2023	Tariff	11/07/2023, 2:45 PM
Appendix R - Not Used as of Sep 9, 2020	Tariff	09/18/2020, 9:04 AM
Appendix S - Small Generator Interconnection Procedures as of Aug 3, 2024 (not accepting new applications)	Tariff	12/17/2024, 11:31 AM
Appendix T - Small Generator Interconnection Agreement as of Sep 1, 2022	Tariff	09/22/2022, 1:11 PM
Appendix U - Large Generator Interconnection Procedures as of Aug 3, 2024	Tariff	12/17/2024, 11:31 AM
Appendix V - Large Generator Interconnection Agreement as of Sep 1, 2022	Tariff	09/22/2022, 1:11 PM
Appendix W - Amendment 39 Interconnection Procedures as of June 28, 2010 Not accepting new applications.	Tariff	03/21/2018, 1:47 PM
Appendix X - Approved Project Sponsor Agreement as of Aug 3, 2024	Tariff	12/17/2024, 11:31 AM
Appendix Y - Generator Interconnection Procedures for Interconnection Requests as of Aug 3, 2024	Tariff	12/17/2024, 11:31 AM
Appendix Z - Large Generator Interconnection Requests Processed Under Generator Interconnection Procedures as of Sep 1, 2022	Tariff	09/22/2022, 1:11 PM
No results

View previous tariff appendices.

Current tariff appendices AA - II

Title	Type	Posted
Appendix AA - Grandfathered Resource Adequacy Provisions for Feb 2018 to Mar 2018 as of Mar 16, 2018	Tariff	03/21/2018, 1:59 PM
Appendix BB - Standard Large Generator Interconnection Agreement as of Sep 1, 2022	Tariff	09/22/2022, 1:11 PM
Appendix CC - Large Generator Interconnection Agreement for Interconnection Requests in a Queue Cluster Window as of Sep 1, 2022	Tariff	09/22/2022, 1:11 PM
Appendix DD - Generator Interconnection Deliverability Allocation Procedures as of Dec 17, 2024	Tariff	12/18/2024, 11:50 AM
Appendix EE - Large Generator Interconnection Agreement for Generator Interconnection and Deliverability Allocation Procedures as of Dec 17, 2024	Tariff	12/18/2024, 11:50 AM
Appendix FF - Small Generator Interconnection Agreement for Generator Interconnection and Deliverability Allocation Process as of Dec 17, 2024	Tariff	12/18/2024, 11:50 AM
Appendix GG - Not Used as of Sep 9, 2020	Tariff	09/11/2020, 8:02 AM
Appendix HH - Not Used as of Sep 1, 2022	Tariff	09/22/2022, 1:11 PM
Appendix II - Market-Based Rate Authority Suspension as of Feb 15, 2021	Tariff	02/19/2021, 8:32 AM
No results

View previous tariff appendices.

Pending tariff changes

Browse pending tariff changes by section or appendix number, title and related docket number. See the Regulatory filings or Amendments page for more information on pending tariff language.

Pending Tariff Language - Tariff Amendment - Interconnection Process Enhancements 2023 - Track 3 (ER25-2044)04/25/2025, 12:56 PM
Sec 24, App DD, App KK
Pending Tariff Language - Tariff Clarification - Spring 2025 (ER25-1875)04/14/2025, 8:20 AM
Sec 33, Sec 40, App A
Pending Tariff Language - Tariff Amendment - Order No. 881 Supplemental Filing (ER25-1236)02/10/2025, 9:21 AM
Sec 6, App JJ
Requested effective date: Open-ended
Pending Tariff Language - Tariff Amendment - Clarify Process After-Market Fuel Cost Recovery (ER25-1035)01/31/2025, 11:22 AM
Sec 30
Requested effective date: Jan 24, 2025
Pending Tariff Language - Tariff Amendment - Capacity Procurement Mechanism (ER25-968)01/31/2025, 11:22 AM
Sec 43A
Requested effective date: approx. Apr 1, 2025
Pending Tariff Language - Tariff Amendment - Pathways - Step 1 (ER25-542)11/26/2024, 9:05 AM
Sec 15, App A
Requested effective date: approx. Mar 31, 2025
Pending Tariff Language - Tariff Amendment - EDAM Access Charge CAISO BAA (ER25-437)11/15/2024, 8:54 AM
Sec 26, Sec 33
Requested effective date: May 1, 2026 (with EDAM/DAME)
Pending Tariff Language - Tariff Amendment - Inter-SC-Trades in WEIM and EDAM Balancing Areas (ER25-94)10/15/2024, 10:19 AM
Sec 29, Sec 33
Requested effective date: May 1, 2026 (with EDAM/DAME)
Pending Tariff Language - Tariff Amendment - Interconnection Process Enhancements - 2023 (ER24-2671)08/05/2024, 11:40 AM
App A, App DD, App KK
Requested effective date: Oct 1, 2024
Pending Tariff Language - Tariff Amendment - Compliance Filing regarding FERC Order No. 2023 (ER24-2042)05/17/2024, 1:25 PM
Sec 25, App A, App B.23, App DD, App KK, App LL, App MM
Requested effective date: May 17, 2024 (retroactive)
Pending Tariff Language - Tariff Amendment - EDAM Access Charge (ER24-1746)04/15/2024, 8:40 AM
Sec 33, App A
Requested effective dates: Jun 12, 2024 & May 1, 2026 (with EDAM/DAME)
Pending Tariff Language - Compliance Filing - DAME/EDAM (ER23-2686)03/06/2024, 9:13 AM
Sec 4, Sec 29, Sec 31, Sec 33, App A, App B.29
Requested effective dates: Dec 21, 2023 & May 1, 2026
Pending Tariff Language - Tariff Amendment - CAISO Balancing Authority Participation in the Extended Day-Ahead Market (ER24-379)11/13/2023, 10:13 AM
Sec 11, Sec 26, Sec 27, App A
Requested effective date: May 1, 2026 (with EDAM/DAME)
Pending Tariff Language - Tariff Amendment - Grid Management Cost and Cost of Service Study (ER23-2974)10/02/2023, 8:47 AM
Sec 11, Sec 29, Sec 33, App A, App F
Requested effective dates: Jan 1, 2024 & May 1, 2026 (with EDAM/DAME)
Pending Tariff Language - DAME and EDAM Tariff Amendment (ER23-2686)08/22/2023, 4:18 PM
Sec 4, Sec 6, Sec 7, Sec 8, Sec 11, Sec 27, Sec 29, Sec 30, Sec 31, Sec 33, Sec 34, Sec 39, Sec 40, Sec 44, App A, App B, App C, App F
Requested effective dates: Dec 21, 2023 & May 1, 2026
Pending Tariff Language - Compliance Filing - Tariff Revisions to Comply with FERC Order No. 881 (ER22-2362)06/16/2023, 4:22 PM
App A, App JJ
Requested effective date: Summer 2025
Pending Tariff Language - Compliance Filing - FERC Order No. 881 (ER22-2362)07/13/2022, 8:12 AM
Sec 6, App A, App JJ
Requested effective date: Summer 2025

eTariff viewer

Use the eTariff viewer to research and view all publicly available documents and information on file within FERC’s eTariff system as of June 28, 2010, pursuant to Order 714.

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Tariff amendments

View all publicly available California ISO-authored tariff amendment filings