Contact Us

    To contact a specific individual at the ISO via email, please use the Contact Us link at the top of any page.

    Our Mailing Address
    California ISO
    P.O. Box 639014
    Folsom, CA 95763-9014

    Our Telephone Number

Home > About Us > Our business

Shaping a clean, flexible grid

As the impartial grid operator for the bulk of the state’s power grid, the ISO opens access to the wholesale power market that is designed to diversify resources and lower prices.  We are committed to preparing the wholesale market for implementing California’s environmental policies.


Understanding the ISO
The ISO operates a robust and reliable wholesale power system that balances the need for higher transmission reliability with the need for lower costs, and acts as a key platform to achieve California’s clean energy goals.

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Publications and financials
Competitive electricity markets produce reliability and economic benefits. Here are the publications that prove it.

ISO incorporation and policies
The ISO is a nonprofit public benefit corporation operating under these bylaws, incorporation documents and enabling legislation. Our employees and the Board of Governors are subject to clear and well defined codes of conduct and policies.

ISO market participants
The below lists contain all market participants, including scheduling coordinators, congestion revenue rights (CRR) holders, convergence bidding entities, generators and transmission owners.

Tours and speaking engagements
Tours of the ISO Folsom control room are available Monday through Friday 10:00 a.m. – 4:00 p.m. by approval only. Groups are limited to 30 attendees.  Tours must be requested at least two weeks in advance for U.S. citizens and two months in advance for foreign visitors for security validation and clearance.


The California ISO provides early warnings of possible electricity outages, which allow the public to better prepare for service interruptions and encourages energy conservation that may help prevent blackouts from occurring.


California ISO overview
The new power grid landscape