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Our Mailing Address
California ISO
P.O. Box 639014
Folsom, CA 95630
Folsom campus
250 Outcropping Way, 95630
Main telephone number: (916) 351-4400
Security telephone number: (916) 351-2303

Home > Contact Us

Contact us

Our business hours are Monday through Friday from 8 a.m. to 5 p.m.


Thank you for your interest in the California ISO. Your questions and comments are important to us. To speak to a representative during business hours, please contact the department below that can best address your inquiry:


Customer Service
(916) 608-7320 

Human Resources
(916) 608-7000 

Media Line
(888) 516-6397

(916) 608-5847

Finance and Accounting
(916) 608-5937

Click here to request a tour

System access or technical issues
(916) 351-2309 or (888) 889-0450

Service Desk for RC West participants only:
Local number: (916) 538-5722
Toll-free number: (833) 888-9378


For questions related to retrieving data over OASIS, visit our OASIS Frequently Asked Questions.

Can’t find what you are looking for or need some help?

Please submit your question via the electronic request form below and a customer service specialist will respond to your inquiry.  Please review our Tips for Asking Questions of the ISO prior to submitting the form to find out how to get a timely and useful response.

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