Our Mailing Address
California ISO
P.O. Box 639014
Folsom, CA 95763-9014
 
Folsom campus
250 Outcropping Way, 95630
Main telephone number: (916) 351-4400
Security telephone number: (916) 351-2303
Map
 
Alhambra campus
1000 South Fremont, 91803
Main telephone number: (626) 299-4468
Security telephone number: (626) 537-2710
Map

 

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 Services
(916) 608-7049 

Human Resources
(916) 608-7000 

Media Line
(888) 516-6397

Procurement and Vendor Management
(916) 608-5847

Finance and Accounting
(916) 608-5937

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