California is the top state in the US for residential solar. But one question remains for many homeowners – how much does solar actually cost? We’ve put together this study to give you an idea of how much solar costs in your region of the state.
Homeowners in California are installing solar on their homes at an unprecedented rate. Although the California solar market is growing every day, solar prices still remain somewhat of a mystery. That’s why we’ve done the research and compiled our Cost of Solar Index for California – to show homeowners what their neighbors are actually paying for solar power across the state.
The average cost of residential solar installed in California in the first six months of 2017 was $18,680. As shown in the above map, that price varies by several thousand dollars depending on the region. These prices are solar installations purchased with a loan or cash, they do not apply to leased systems or power purchase agreements.
Overall, the highest average prices ($20,854) are in the Redding and Shasta/Cascades region, while the lowest average prices ($15,939) can be found in the Central Coast Region. The map above shows how much homeowners across California paid to install residential solar panels in the first six months of 2017 after the federal incentive (the federal solar investment tax credit) had been applied.
*Note that customers served by the Los Angeles Department of Water and Power or Sacramento Municipal Utility District, as well as other smaller utility districts, may be eligible for additional rebates from their utility, reducing the cost of solar further.
This is the average price for PURCHASED residential solar systems after federal incentives, first six months of 2017.
System sizes vary from house to house, but the average size for California residential systems was 6.1 kW in the first six months of 2017.
After the federal incentive, this is the average price paid per watt of solar in California, first six months of 2017.
The overall price of a residential solar system (not to be confused with the price per watt – see below), in the first six months of 2017 is $18,680. This includes the federal incentive (the federal solar investment tax credit), but ignores any of the regional incentives homeowners may be eligible for (California solar rebates are no longer available in areas served by PG&E, SoCal Edison, or SDG&E).
Overall costs for home solar systems have stayed shockingly stable since 2015, with our data indicating that the average price in 2015 was $18,675, and in 2016 it was $18,497. However, while system prices have stayed stable, declines in price per watt have led to homeowners being able to buy progressively larger systems for the same price. We look at this interesting twist in the cost of solar in California below.
|Region||Average of Total System Cost After Incentives – 1st 6 mo 2017|
|Central Coast||$ 15,939|
|San Francisco Bay area||$ 17,050|
|San Diego||$ 17,224|
|North Coast||$ 17,831|
|Sonoma / Napa / Solano Counties||$ 18,032|
|Los Angeles / Ventura Counties*||$ 18,298|
|Orange County||$ 18,412|
|Central Valley||$ 20,153|
|San Bernardino / Inland Empire||$ 20,418|
|Central Sierra||$ 20,447|
|Redding and Shasta / Cascades||$ 20,854|
The size of a residential solar system depends on the amount of power you need, and on the size of your roof and amount of sunlight it receives. In areas where prices per W are cheaper and there’s enough space, homeowners generally add as many panels as possible. Across California, the average system size of a solar panel system installed in the first six months of 2017 was 6.1 kW – a significant increase over the average 5.5 kW of 2015 and 5.8 kW of 2016. As you can see, the biggest installations on average occur in the Redding and Shasta/Cascades region (7.2 kW), while the smallest installations are in the San Francisco Bay region (5.1 kW).
The graph above shows the average prices you can expect to pay per watt (W) for the different regions across the state. The price you pay per kilowatt varies slightly depending on your region, but the overall average price per W in California is $3.09. This average is calculated after the federal incentive has been applied. The lowest price per kilowatt in the first six months of 2017 was seen on the North Coast ($2.88) while the highest ($3.34) was seen in both the San Francisco Bay area as well as Sonoma / Napa /Solano Counties.
|Region||Average Cost per W post Incentives 1st 6 Mo 2017|
|Central Coast||$ 3.07|
|San Francisco Bay area||$ 3.34|
|San Diego||$ 3.02|
|North Coast||$ 2.88|
|Sonoma / Napa / Solano Counties||$ 3.34|
|Los Angeles / Ventura Counties*||$ 3.15|
|Orange County||$ 3.12|
|Central Valley||$ 3.01|
|San Bernardino / Inland Empire||$ 3.09|
|Central Sierra||$ 3.10|
|Redding and Shasta / Cascades||$ 2.90|
At Solar to the People, our goal is to provide clear, third-party information to help homeowners make intelligent decisions about going solar. The Cost of Solar Index for California is our effort to help inform California homeowners about costs of going solar in the Golden State. The data for this study comes from the California DG Stats site, and is based on the newest state-wide data set which includes installation costs – the “Currently Interconnected” data set. Outliers were excluded, and the final data was based on 33,349 residential solar systems installed in California in the first six months of 2017.