Transmission operations ensure the flow of electricity
Our operations reporting, coordination and maintenance efforts help keep the lights on for 30 million people in our balancing authority.
Transmission Control Agreement
The terms and conditions for how the ISO and participating transmission owners will discharge their respective duties and responsibilities.
Transmission access charge (TAC)
Charges assessed, on behalf of the Participating Transmission Owner, to parties who require access to the ISO grid.
Transmission access charge rates
Non-PTO wheeling data submission requirements
Transmission operating procedures
3100 - Policy
3200 - Outage coordination
3300 - System and voltage monitoring and control
3500 - Interchange management
3600 - System modeling
All transmission outages must be reported to the ISO with a description of the cause and all remedial actions taken. Information is confidential. Access requires a valid user certificate.
The ISO provides limited access to the register of transmission facilities and entitlements (RTFE) to participants with a demonstrated, legitimate business need in accordance with FERC's January 24, 2003 Order in Docket No. ER03-219. RTFE information is considered critical energy infrastructure information.
Transmission maintenance procedures
Policies and procedures serve as guidelines for participating transmission owners.
Transmission Maintenance Coordination Committee
This independent committee gathers input from participating transmission owners and interested stakeholders on the ISO transmission maintenance standards, reviews proposed changes, recommends revisions to the standards, and advises the ISO vice president responsible for transmission maintenance.
Transmission Maintenance Coordination Committee meetingsQuarterly meetings of a committee made up of electric utility industry experts to discuss maintenance concerns, recent improvements in maintenance and construction processes/techniques, industry best practices and vegetation management.
Transmission Maintenance Coordination Committee meeting Jan 21, 2016
Transmission Maintenance Coordination Committee meeting Oct 15, 2015
Transmission Maintenance Coordination Committee meeting Jul 16, 2015
Transmission Maintenance Coordination Committee meeting Apr 16, 2015
Transmission Maintenance Coordination Committee meeting Jan 15, 2015
Transmission Maintenance Coordination Committee archive
Participating transmission owner tariffs and agreements
Participating transmission owner tariffs
Each participating transmission owner's tariffs for facilities under ISO operational control.
Participating transmission owner applications submitted
See terms and conditions for agreements between California ISO and transmission owners.
Participating transmission owner applications submittedSee terms and conditions for agreements between California ISO and transmission owners.
Citizens Sunrise Transmission LLC
City of Anaheim
City of Azusa
City of Banning
City of Colton
City of Pasadena
City of Riverside
City of Vernon
Imperial Irrigation District
Startrans IO, LLC
The Nevada Hydro Company, Inc. (TNHC)
Trans-Bay Cable LLC
Valley Electric Association, Inc.
Western Area Power Administration