Solar Calculator for California: Costs, Incentives & ROI
California leads the United States in installed residential solar capacity, with more than 1.5 million rooftop systems generating power across every climate zone in the state. Homeowners benefit from abundant sunshine, electricity rates that rank among the highest in the nation, and a long-running family of incentive programs administered by the California Public Utilities Commission. The economics of rooftop solar shifted in April 2023 when Net Energy Metering 3.0 took effect for the three large investor-owned utilities — Pacific Gas & Electric, Southern California Edison, and San Diego Gas & Electric. Under NEM 3.0, the credit value for electricity exported to the grid was reduced by roughly 75 percent compared to NEM 2.0, which lengthened payback periods for solar-only installations. Pairing rooftop solar with battery storage typically restores most of the lost economic value because stored energy can be self-consumed during high-rate evening peak hours rather than exported at the lower NEM 3.0 avoided-cost rate. Use the calculator below to estimate your specific 25-year savings based on your ZIP code, system size, electricity usage, and whether you plan to add a battery.
Incentive data updated: May 2026(may be outdated)
Average Solar Cost in California
Average installed solar costs in California typically run between $2.80 and $3.50 per watt for residential systems before any incentives, based on contractor pricing surveys from the Lawrence Berkeley National Laboratory and EnergySage marketplace data. A typical 6 kW system therefore costs roughly $16,800 to $21,000 before the federal Investment Tax Credit. Pricing in California sits slightly above the national residential average — about $3.00 per watt nationwide — because labor costs, permitting fees, and the prevalence of feature-rich proposals (microinverters, monitoring, premium warranties) push installer pricing upward in major metro markets. The 30 percent federal Investment Tax Credit, available through 2032 under the Inflation Reduction Act, applies to the full cost of equipment plus labor and permitting, which brings the net cost of a typical 6 kW system down to approximately $11,800 to $14,700. California does not offer a separate state tax credit for residential solar, but the Active Solar Energy System Exclusion exempts the added value of the installation from property tax reassessment through January 1, 2027. Larger systems above 8 kW frequently see a small per-watt discount as fixed permitting and design costs amortize across more capacity.
- Avg. installed cost
- $3.15/W
- Typical 6 kW system
- $16,800–$21,000
Top Solar Incentives in California
Live incentive data not currently available for California. See the federal incentive guidance via our Solar Tax Credit Calculator.
Electricity Rates in California
California has some of the highest residential electricity rates in the country. The 2025 statewide average sits near 30 cents per kilowatt-hour according to EIA data — roughly twice the national average — and certain Pacific Gas & Electric rate schedules push effective rates above 50 cents during peak windows. The three large investor-owned utilities all use tiered, time-of-use pricing that significantly affects solar economics. PG&E residential customers on the E-TOU-C rate pay about 50 cents per kWh during peak weekday evening hours and roughly 40 cents during off-peak windows. Southern California Edison and San Diego Gas & Electric use similar time-of-use structures with peak windows typically falling between 4 PM and 9 PM. Under NEM 3.0, exports during peak hours earn a higher avoided-cost rate than off-peak exports, which is why pairing solar with battery storage substantially improves returns — stored energy is dispatched during the high-value evening peak rather than exported midday at the lowest avoided-cost rate. Municipal utilities such as the Sacramento Municipal Utility District and Los Angeles Department of Water and Power maintain their own rate structures and net-metering programs, often offering more favorable export terms than the IOUs.
Peak Sun Hours in California
California averages between 5.0 and 6.5 peak sun hours per day across its varied climate zones, placing it among the strongest solar resources in the country. The Mojave and Colorado deserts in the southeast — including parts of Riverside, San Bernardino, and Imperial counties — exceed 6.5 peak sun hours and experience some of the highest direct normal irradiance on Earth. The Central Valley, including Fresno and Bakersfield, averages 5.5 to 6.0 hours and benefits from clear summer skies. Coastal Southern California, including Los Angeles and San Diego, averages 5.4 to 5.8 hours per day. The foggier Bay Area averages closer to 4.8 hours, and the Northern coast and parts of the Sierra Nevada with frequent winter precipitation see lower averages around 4.5 to 4.8. NREL's PVWatts tool uses ZIP-code-level Typical Meteorological Year data to model month-by-month variation specific to your address, so the production estimate from the calculator below reflects local microclimate rather than just statewide averages.
Example ROI for a 6 kW System
- Estimated annual savings
- $1,850
- Payback period
- 8.5 years
- 25-year net savings
- $34,000
Run a personalized estimate with your ZIP code using the Solar ROI Calculator.
Major Cities in California
- Los Angeles90001
- San Diego92101
- San Francisco94102
- San Jose95110
- Sacramento95814
Common Questions About Solar in California
How does NEM 3.0 affect solar payback in California?
Net Energy Metering 3.0 took effect in April 2023 for new residential customers of the three large investor-owned utilities (PG&E, SCE, and SDG&E). It replaced NEM 2.0's near-retail-rate export credits with avoided-cost-of-generation credits that average roughly 75 percent lower. For a solar-only system, this typically extends payback from around 6 to 7 years under NEM 2.0 to 9 to 12 years under NEM 3.0. Adding a battery storage system shifts most of your solar production from low-value midday export to high-value evening self-consumption, which restores much of the lost economics. Customers grandfathered into NEM 2.0 before April 14, 2023 keep that tariff for 20 years from the original interconnection date.
What is the SGIP rebate and am I eligible for it?
The Self-Generation Incentive Program (SGIP), administered by the California Public Utilities Commission, provides upfront rebates for behind-the-meter battery storage systems. Eligibility and rebate amounts depend on customer category. The General Market step typically pays around $150 per kilowatt-hour of usable battery capacity, while the Equity and Equity Resiliency tiers pay substantially more — often the full installed cost — for low-income households or customers in high-fire-threat districts who depend on electricity for medical needs. SGIP funding is allocated annually and may be exhausted before year-end in popular categories. Battery systems must be permitted, interconnected, and commissioned through your utility before applying. SGIP can be combined with the federal 30 percent Investment Tax Credit on standalone or solar-paired battery storage.
Are there property tax exemptions for solar in California?
Yes. California's Active Solar Energy System Exclusion prevents county assessors from increasing your property's assessed value to reflect the installed cost of an active solar energy system. The exclusion applies to qualifying solar electric and solar thermal systems installed before the new construction sunset date of January 1, 2027 (which the Legislature has historically extended). The exclusion runs with the property until ownership changes, at which point the exclusion is preserved as long as the system remains in place. There is no separate state income tax credit for residential solar in California, so the property tax exclusion plus the 30 percent federal Investment Tax Credit are the two primary tax-related savings.
Which California utility offers the best solar economics?
Solar economics generally improve as your retail electricity rate rises, because each kilowatt-hour you self-consume avoids that retail rate. Among the large investor-owned utilities, PG&E typically has the highest residential rates, followed by SDG&E and SCE — so a kilowatt-hour of solar production saves more on a PG&E bill than on most municipal utility bills. However, several municipal utilities still operate under NEM 2.0-style retail-rate net metering with no NEM 3.0 transition, including the Sacramento Municipal Utility District (SMUD) and the Los Angeles Department of Water and Power. In those territories, solar-only systems may still pencil out without battery storage. Always verify your specific rate schedule and any community choice aggregator overlay before sizing a system.
Should I add a battery to my California solar system?
For most NEM 3.0 customers in California, yes — the economics now favor systems that pair solar with battery storage rather than solar-only installations. A typical 10 kWh battery shifts roughly 8 to 10 kilowatt-hours of daily solar production from low-value midday export to high-value evening self-consumption, which can improve 25-year savings by 30 to 50 percent compared to a solar-only NEM 3.0 system. Beyond economics, batteries provide backup power during the increasingly common Public Safety Power Shutoff events triggered by wildfire risk. Customers in PG&E and SCE high-fire-threat districts may also qualify for the SGIP Equity Resiliency tier, which can cover most or all of the battery cost upfront.