The average cost of solar panels in California is around $2.73 per watt, with a total average cost of $16,380 for a 6-kilowatt system.
As of 2026, the average cost of solar panels per watt in California is $2.65. This translates to a total cost of $15,900 for a standard 6 kW solar panel system.
The California Public Utilities Commission reports that the average cost of solar panels per watt has decreased by over 70% in the last decade, with current prices averaging around $2.70 per watt.
Researchers at UC San Diego found that the average cost of solar panels per watt in California varies by region, with prices ranging from $2.50 to $3.00 per watt, depending on the location and installer.
The Solar Energy Industries Association reports that California offers several incentives for solar panel installations, including the Solar on Multifamily Affordable Housing (SOMAH) program, which can help reduce the average cost of solar panels per watt.
Use our solar panel cost calculator to estimate the cost of a solar panel system in California, based on your energy usage and location. The average cost per watt is around $2.75.
Watch our video to learn more about the average cost of solar panels per watt in California, and how to find the best solar panel installers in your area.
Compare solar panel prices in California from top installers, with average costs per watt ranging from $2.50 to $3.25, depending on the equipment and installation company.