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Home > Participate > Resource Interconnection Guide > Utility Distribution Companies

Utility distribution companies


Map of utility service areas within California

Click here to access a map of the utility companies in California.  If your project will interconnect to the grid via a distribution line, you will need to contact the utility service provider where the project is located.


Links to the utilities’ interconnection materials

Use the links below for your utility’s interconnection page for information about their interconnection process and requirements.

UDCs inside the ISO balancing authority

City of Anaheim

City of Azusa​

City of Banning

City of Pasadena

City of Riverside​

City of Vernon​

Pacific Gas and Electric

San Diego Gas and Electric​

Southern California Edison​

SCE's Generator Interconnection Process

UDCs outside the ISO balancing authority


Links to Investor Owned Utilities’ electric transmission maps

Locate the nearest interconnection facility to your project, if it is located within the Pacific Gas and Electric, San Diego Gas and Electric or Southern California Edison service areas, through maps of electric transmission lines, distribution lines and associated substations.  Registration is required.  Please follow the instructions on the respective web page to register for access to these maps.