are there any local, state and federal credits or rebates for solar panels in CA?

We are looking into installing solar panels in San Francisco, CA. Are there local, state and federal credits and rebates?
Also, how many years does the system last before you need to renew it and how much is the maintenance cost per year? What are the average savings on utility bills?

Homeowner in San Francisco, CA (Posted on April 28, 2011)

At this time there is a Federal Tax Credit in place for Solar Electric Systems and potentially a Utility Company rebate. Eagle Shield customizes Solar Systems for each home to maximize production, savings, expandability, and quality. Generally, there is little to no maintenance required at no cost. Saving on utility bills vary greatly. With a Free Solar Energy Audit from Eagle Shield, each homeowner will receive an exact price quote and anticipated utility savings

Garrett Harwood
Eagle Shield Inc.