Diligent oversight ensures a competitive market
The California ISO is regulated by the Federal Energy Regulatory Commission, an independent federal agency that regulates the interstate transmission of electricity, natural gas, and oil. The California Public Utilities Commission regulates investor-owned utilities operating in the ISO balancing authority area. Publicly owned utilities in California are regulated by their respective city councils or other governance bodies.
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 conformed tariff
Download the entire tariff or browse by section or appendix number, title and effective date below.
Pending tariff by section and appendix
Browse pending tariff changes by section or appendix number, title and related docket number. Each document footer provides a link to related filings.
Previous California ISO tariffs are available here in reverse chronological order.
All publicly available California ISO-authored tariff amendment filings are posted here in reverse chronological order.
All publicly available California ISO-authored filings and FERC orders are posted here in reverse chronological order. Regulatory orders are also available at www.ferc.gov or www.cpuc.ca.gov.