What is the solar score for California?

California has a solar score of 66/100 (Strong), ranking #2 of 51. The composite blends solar irradiance (5.8 kWh/m²/day, 40%), incentive density (30%), and modeled payback (30%).

How long does it take for solar panels to pay for themselves in California?

The estimated payback for a 6 kW system in California is 6.3 years, ranking #2 of 51 for speed to break-even. At a $19,200 system cost and $3,049/year modeled savings, that implies +$57,025 net over 25 years before rate escalation.

How much does a solar system cost in California?

A 6 kW residential system in California averages $19,200 before incentives, or $3.20 per watt. California has 4 tracked state and utility incentive programs that can lower net cost.

How much electricity do solar panels produce in California?

A 6 kW system in California produces an estimated 10,162 kWh/year, based on average irradiance of 5.8 kWh/m²/day. Actual output varies with roof orientation, shading, and panel efficiency.

What solar incentives are available in California?

California offers 4 solar incentive programs including tax exemption, net metering, rebate, and more. Net metering here is classified as partial.

Does California have net metering for solar?

California's net-metering policy is classified as "partial." Homeowners receive partial (often avoided-cost) credit for excess exports.

State solar profile · #2 of 51

Solar in California: fast payback · high rates

Name: California Solar Data, Cost, Incentives & ROI
Creator: PlainSolarData
Published: 2024-10-01
License: https://creativecommons.org/publicdomain/zero/1.0/

California clears a modeled 6.3-yr break-even (#2 of 51) at 30¢/kWh and 5.8 kWh/m²/day, with 4 DSIRE programs in the stack.

5.8
kWh/m²/day irradiance: 30¢
avg electricity rate: 6.3 yr
payback (#2): 4
incentive programs

66 Strong

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NREL/EIA solar strip

Nameplate CA · California score #2/51

California | 66/100 | 6.3 yr payback | 22.6 GW

FORM860 66/100
MW #2/51
SCORE 5.8 kWh
RANK 30c/kWh
SUN 6.3 yr
RATE 22.6 GW
PAY 4 programs
CAP near Hawaii

Stamps derive from this state's NREL irradiance, EIA Form 860 / Electric Power Monthly nameplate, and DSIRE incentive row (score, rank, sun, rate, payback, capacity, programs, peer), not a quote or site assessment. Modeled figures use a typical 6 kW system; your roof, shading, and utility tariff decide the real return. See our disclaimer. Verify with EIA Form 860 → · Read with methodology → · Tax credits and incentives → · Personalized estimate → · All state rows → · States ranked → · Payback vs U.S. avg (14.2 yr): 7.9 yr faster

HI

5
CA

6
CT

9
MA

9
ME

9
RI

10

What this shows California sits at 6.3 years among nearest payback peers (7.9 yr faster vs the 14.2-yr U.S. average).

Fast-band 25-year ROI · California

$19,200

system cost

$3,049/yr

modeled savings

6.3 yr

break-even

+$57,025

25-year net

At $19,200 and $3,049/yr, California is already in the faster third of modeled paybacks. Roof, shading, and tariff still move the real number. Run a personalized estimate →

Installed solar capacity in California, 1990–2024

Total solar nameplate capacity in California reported to the EIA, utility-scale and reported distributed systems. The number of reporting facilities grew 87.8x (10 to 878) between 1990 and 2024, and the average site size held near 26 MW per site, a steady installation profile.

California now has about 22.6 GW of installed solar capacity across 878 reported facilities.

Source: U.S. Energy Information Administration, installed solar nameplate capacity As of 2024

California on the sun-and-speed corner

Irradiance 5.8 kWh/m²/day (at/above the 4.8 national mean) vs 6.3-yr payback (fast band vs 14.2-yr mean). Crosshairs mark those means.

California (highlighted): 5.8 kWh/m²/day, 6.3-yr modeled payback - faster than the national average.

Source: PlainSolarData model, NREL irradiance + EIA rates As of 2024

Solar & grid details

Net-metering policy: partial
Renewable portfolio standard: Mandatory (100% by 2045)
Installed cost / watt: $3.20/W
Annual production (6 kW): 10,162 kWh
Installed capacity (EIA 2024): 22.6 GW
Notable programs: SGIP Battery Storage Incentive, NEM 3.0

Top incentive programs

4 programs available for California residents

Tax exemption CA Active Solar Energy System Property Tax Exclusion · Full property tax exclusion Net metering California NEM 3.0 (NBT) · Time-of-use export rates Rebate CA Green Tariff/Enhanced Community Renewables · Varies by utility Rebate Self-Generation Incentive Program (SGIP) · $0.25-$0.85/Wh for battery storage

All California solar incentives (4)

Tax exemption

CA Active Solar Energy System Property Tax Exclusion

Full property tax exclusion

Active solar energy systems are excluded from California property tax assessment.

Authorized through 2025-12-31

Net metering

California NEM 3.0 (NBT)

Time-of-use export rates

Under NEM 3.0, solar exports are credited at hourly avoided cost rates. Paired storage increases value significantly.

Rebate

CA Green Tariff/Enhanced Community Renewables

Varies by utility

Low-income customers may access community solar at reduced rates.

Rebate

Self-Generation Incentive Program (SGIP)

$0.25-$0.85/Wh for battery storage

SGIP provides incentives for battery storage paired with solar. Highest incentives for equity-eligible customers.

Other fast-payback peers for California

Two non-geographic peer sets for California: composite score neighbors and payback-year neighbors (deduped so each row links a distinct comparison).

Similar composite solar score

Nearest nationwide matches on the NREL/EIA/DSIRE blend (66/100 here).

Hawaii · score 67/100
Arizona · score 61/100
New Mexico · score 57/100
Nevada · score 53/100

Similar modeled payback

Nearest payback-year peers nationwide (6.3 yr modeled here).

Connecticut · 8.9 yr payback
Massachusetts · 9.2 yr payback
Maine · 9.3 yr payback

Peers are nearest-neighbor matches on published composite scores and modeled 6 kW payback years; rankings above use the same fields but sort the full corpus.

Solar resource from NREL; electricity rates and installed capacity from the U.S. EIA; incentive programs from DSIRE. See our methodology.

Compiled from official public sources by the publisher. · Updated July 2026