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California Solar

Data Current Through:
Q4 2023
Solar Installed (MW):
National Ranking:
1st (2nd in 2023)
Enough Solar Installed to Power:
13,904,267 homes
Percentage of State's Electricity from Solar:
Solar Jobs:
Solar Companies in State:
2,306 (405 Manufacturers, 1,047 Installers/Developers, 854 Others)
Total Solar Investment in State:
$102.8 billion
Prices have fallen
47% over the last 10 years
Growth Projection and Ranking:
19,872 MW over the next 5 years (ranks 2nd)
Number Of Installations:

California has the largest solar market in the U.S. and has been a longtime champion of solar because of the many economic and environmental benefits it provides, including billions in local investment. Solar supplies more than 20 percent of California’s electricity today, but it must play a bigger role if the state is to reach climate and energy goals.

Get involved in political advocacy through SEIA's California PAC

SEIA California State Solar Policy Priorities

Residential Solar Mandate and the Investment Tax Credit

Beginning in 2020, all new homes built in California must have solar, prompting new questions about who’s eligible take advantage of the solar Investment Tax Credit (ITC). While the specifics will depend on your situation, the solar ITC will generally go to whoever owns the system. If a homeowner buys a newly built home with solar and owns the system outright, the homeowner is eligible for the ITC the year that they move into the house. If the homeowners leases the solar system or purchases electricity from the system through a power purchase agreement (PPA), then the ITC is claimed by the company that leases the system or offers the PPA.

Additional Priorities & Recent Highlights
  • SEIA passed SB 364, which preserves the solar property tax exclusion regardless of the outcome of Proposition 15.  Without the legislation, Prop 15 would have rolled back the solar property tax exclusion for existing and new projects, putting much of California’s solar fleet at risk of default.
  • SEIA successfully advocated for new rules to capture the full capacity value of solar+storage systems, making solar+storage more competitive with natural gas.
  • SEIA secured a permit to allow more than 4,000 MW of shovel-ready solar projects to move forward as California considers additional protections from the Joshua Tree under the California Endangered Species Act.
  • SEIA reached a settlement in the San Diego Gas and Electric General Rate Case, achieving changes to SDG&E’s rates that will allow more customers to adopt solar and storage, and that require the utility to consider further rate changes favorable to solar customers in 2021.
  • SEIA reached a settlement in Southern California Edison’s General Rate Case that will require the utility to consider the value that solar provides in meeting grid needs before spending ratepayer dollars on grid upgrades, ensuring that solar is recognized for the benefits it delivers to SCE’s distribution system.
  • SEIA has successfully delayed the approval of a proposed solar installer citation program that would have been unworkable and added significant costs for solar installers, and has persuaded policymakers to revisit the proposal before moving forward.
  • SEIA achieved significant improvements to the CPUC’s avoided cost calculator tool, which will be used to determine the benefits that distributed solar provides. SEIA is now leading an industry coalition in the state’s proceeding to review net metering.

For more information on SEIA's work in California, please contact Stephanie Doyle.



View more solar industry data.

Notable Solar Installations in California

  • Mount Signal Solar Farm in Calexico was developed by 8 Minute Energy and was developed from 2018-2020. This 527.8 MW project produces enough electricity to power 146,345 homes..5
  • Kaiser Permanente, Apple, and Prologis have all gone solar in California. Apple's 173 MW California Flats project in Parkfield is the largest corporate project in the state. 6  
  • At 325 MW, Aquamarine in Lemore is among the largest solar installations in California. Completed by CIM in 2021, this solar project has enough electric capacity to power more than 90,114 homes.

Check out our Major Solar Projects List for more notable installations.

Solar Companies in California


Looking for a local installer? Use SolarReviews to get company reviews and estimates for solar in your area. You can also view the average costs for installing solar in California, based on real price data from installed systems and solar quotes.

Don't see your company listed? Complete our National Solar Database Survey!

If you're looking for information about local solar companies, check out EnergySage's list of solar companies in California, where you can check out information about each company and see real customer reviews.

California State Solar Policy Resources

California Public Utilities Commission – Learn about the governing body that regulates the electricity rates and services of California public utilities

California Solar Panels Overview - Learn about the history of solar policy in California, along with up-to-date pricing information on EnergySage

California Solar Initiative – Read information on the solar rebate program for customers of California's investor-owned utilities

California State Energy Commission – Find a wide variety of information on state government energy programs, policy, projects, energy-saving strategies and energy-related statistics

California State Legislature – Track pending legislation affecting solar energy, locate and contact individual legislators, and stay up to date on current legislative issues in California 

DSIRE Incentives Database - California – Search a public clearinghouse for specific solar energy incentives in California and across the United States

U.S. Energy Information Administration - California State Profile – Explore official energy statistics, including data on electricity supply and demand, from the U.S. government

Solar Panel Cost in California - Learn about the history of solar policy in California, along with up-to-date pricing information on EnergySage

Solar Rebates & Incentives in California - Check out EnergySage's list of key solar incentives in California to see what programs you can benefit from