All electric customers of PG&E, Southern California Edison (SCE), and SDG&E are eligible to apply for incentives. The new California Solar Initiative Handbook (Acrobat PDF file, 95 pages, 1.2 megabytes) provides detailed information on the CSI eligibility, application requirements, payment process, and more.
If a municipal natural gas customer takes electric service from PG&E, SCE, or SDG&E, that customer is eligible for solar incentives. Many publicly owned utilities already offer solar incentives. All other municipal electric utilities must develop such programs no later than January 2008.
If you're unsure of your utility's name, either check your bill, or find it here.