Solar Panel Cost in California: $2.47/W, 9.7-Year Payback

Solar in California costs about $19,760 for 8 kW at $2.47/W and pays back in roughly 9.7 years at 33.6¢/kWh with the federal credit at $0.

Updated September 2026 · Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

By SolarCostData Data Desk · Reviewed September 2026 · Corrections log

On this page: CalculatorTableHow we calculatedSources

Why California’s payback lands where it does

California’s July 2026 average of 33.6 cents per kilowatt-hour is the second-highest rate in the nation, up about three percent from 32.66 cents the year before, and it’s the single biggest reason the state’s typical payback comes in at just 9.7 years — despite net billing, not because of it. Good sun helps too — yield of 1,610 kilowatt-hours per installed kilowatt is well above the national middle — but it’s the sheer size of the retail rate doing most of the work here. Pacific Gas & Electric, the largest utility with over five million residential customers, actually bills below the statewide average at 31.7 cents, which means the blended state figure is being pulled higher by other utilities rather than by PG&E alone. California pays for exported solar under net billing, well below the retail rate, so the fast payback comes almost entirely from self-consumption at a very expensive rate rather than from credited exports.

Electric utilities in California

The state average hides real spreads between utilities. The largest residential utilities EIA-861 lists for California, with each one’s own average bundled residential price (2024 — revenue ÷ sales, the audited annual figure, not this month’s tariff):

Your utility decides California’s real number — the ZIP lookup finds it in three clicks; the 2024 annual utility averages above sit apart from the June-2026 monthly 33.6¢ state figure.

California’s rate, the last 24 months

July 2025 → July 2026: 32.66¢ → 33.61¢. The rate tracker has every month against the US average.

An 8 kW system in California, priced out

The $2.47/W used above comes from EnergySage marketplace quotes (August 2026). Those are quotes in a competitive online market, not signed contract prices.

For comparison, Lawrence Berkeley National Laboratory’s Tracking the Sun reports $4.19/W for California in 2025 (n=36,162) — 1.70x higher. The two measure different things: LBNL records prices actually reported to incentive programs, including dealer-fee financing and full retail channel costs, while EnergySage reflects what a price-sensitive online shopper is quoted. The real market median is probably between them. At the LBNL price this system would cost $33,520 and take about 16.2 years to pay back, against 9.7 at the quote-based figure — treat that as the upper case.

Read that table with one caveat: $2.47/W is California’s market average, and it is the input most likely to differ for you. A quote $0.50 per watt above or below the $2.47 used here moves the payback by roughly a year and a half in either direction.

How much sun California actually gets

A kilowatt of panels in California produces about 1,610 kWh a year on an unshaded, south-facing roof at a 20-degree pitch. Sites that swap California’s 1,610 kWh for a single national average are how Arizona and Washington end up with identical paybacks despite a 1.6x real difference in output.

That figure is a five-point cluster around Los Angeles. It is a state average, and in California that hides a lot: Eureka 1302 to Riverside 1640 — a 26% span. A population-weighted state figure would be nearer 1550; the largest-metro rule was kept, so this uses Los Angeles. If you are not near Los Angeles, treat the number as a starting point and run your own address through a modelling tool.

City-level figures for California

We have separately modeled production for 7 California cities, and they are 26% apart — Eureka at 1,302 kWh per kW against Riverside at 1,640. Installed cost held at $2.47/W; paybacks use each city’s own utility tariff and export treatment where we have official EIA-861 data, which is why some differ sharply from this page’s state-average model.

• Riverside — 1,640 kWh per kW, payback about 8.2–14.8 years (on its own utility’s tariff)
• Los Angeles — 1,610 kWh per kW, payback about 7.1–12.0 years (on its own utility’s tariff)
• Bakersfield — 1,579 kWh per kW, payback about 10.3 years (on its own utility’s tariff)
• San Diego — 1,576 kWh per kW, payback about 10.1 years (on its own utility’s tariff)
• Fresno — 1,546 kWh per kW, payback about 10.5 years (on its own utility’s tariff)
• Sacramento — 1,541 kWh per kW, payback about 9.8–17.5 years (on its own utility’s tariff)
• Eureka — 1,302 kWh per kW, payback about 12.4 years (on its own utility’s tariff)

Those are real PVGIS-NSRDB location points, not the state figure scaled by guesswork. All California and other city figures .

Two adjustments matter before you apply this to your own roof:

• Shading and orientation. The 1,610 kWh figure assumes an unobstructed south-facing array. A real California roof — its own azimuth and pitch, a tree or a chimney — typically produces 10-25% less; this page models 90% of the ideal, so the 11,592 kWh/year above is already derated from 12,880. A genuinely unshaded south roof can adjust upward in the calculator.
• Year-to-year weather moves output by roughly ±5% either way.

Sunshine like this comes with cooling load, and the two run in phase: the hours a California array produces most are the hours central air conditioning costs the most to run , which quietly raises the share of output used on site. Charging an EV in those same daylight hours is the natural next move — the EV + TOU + whole-home calculator prices it against California’s rate.

How California compares with the other 49

California ranks 2nd of 50 on electricity price and 2nd on annual output value per kW installed — close enough that its rate is a fair proxy for its solar case, which is not true everywhere. Its immediate neighbors on price are Hawaii (48.0¢) just above and Maine (32.4¢) just below.

Maine is California’s closest comparable-rate analogue — 32.4¢/kWh, roughly 1,225 kWh per kW, and a payback about 1.7 years apart (8.0 vs 9.7 years). Use it as a directional marker rather than a proxy — the gap is real.

Net billing: the rule that decides solar in California

California does not credit exports at the retail rate — this is net billing , not net metering. The program is Net Billing Tariff (NEM 3.0), in force since 2023-04-15, and it credits surplus power at a published rate of 6.50¢/kWh — against a retail rate of 33.6¢.

Export credits come from the CPUC Avoided Cost Calculator , which sets a different price for every hour of every month split weekday/weekend — 576 values a year — so there is no single export rate. Commonly reported annual averages land in the 5-8c band against a retail rate near 34.7c; 6.5c, the midpoint, is used here.

Because a typical California home uses only about 40% of its generation as it is produced, most of what the panels make is sold at 6.5¢. That is why the payback above is 9.7 years rather than the 5.1 years the same hardware would return under full-retail net metering. Raising self-consumption — a battery (worth its own arithmetic: is a home battery worth it? ), an EV charged in daylight, daytime occupancy — is the lever that closes the gap. Whether a California buyer should own a battery or take a lease/TPO deal is priced in the battery buy vs. TPO calculator .

Because the ACC is hourly, your own average depends on when your array actually exports. Evening export is worth far more than midday export.

One limit worth knowing: this reflects investor-owned, state-regulated utilities; California’s municipal utilities and co-ops are exempt in most cases and set their own terms.

What is actually left in California

The 30% federal credit ended for systems completed after December 31, 2025, so it is $0 here as everywhere. What remains is state, utility and local — and it varies far more than the federal rule ever did.

Do not budget for SGIP battery rebate. Closed. Ratepayer budgets are shut to new applications and the state-funded RSSE allocation is exhausted with a waitlist. Separately, California has NO state solar income-tax credit at all.

Tax exemptions

On property tax: An active-value EXCLUSION rather than an exemption, and standalone batteries are outside it.

If that list looks thin, it is — the solar incentives hub shows which states still put real money on the table, and where California sits among them.

Is solar worth it in California at 33.6¢/kWh?

California is about as good as this gets in 2026: an expensive grid and enough sun to run a system hard. At 33.6¢/kWh against roughly 1,610 kWh per kW, the case closes on its own without any federal help.

A payback under ten years also changes the timing question: once the numbers clear this comfortably, waiting has a cost of its own, and when to buy solar prices that out.

Two numbers put that in context. At California’s rate, the electricity an 8 kW system would produce is worth about $2,011 a year, so the system costs roughly 9.8 years of that output to buy outright — a simple division, before costs. The headline 9.7-year figure above is the full model: it additionally counts 2.5%/yr rate inflation, $150/yr of running costs and one inverter replacement, which is why the two differ slightly. And doing nothing is not free: 25 years of that same electricity, with rates rising at 2.5% a year, comes to about $133,079.

For a 15-year payback in California — given its sunshine rather than a national average — the electricity rate would need to be about 11.8¢/kWh. California is at 33.6¢, which is comfortably above that line.

Sources and method

• Electricity rate: U.S. Energy Information Administration, average price by state — EIA Table 5.6.A, July 2026 data (released Sep 2026). Rate shown is California’s residential average.
• Production: PVGIS v5.2 with the PVGIS-NSRDB radiation database, 1,610 kWh/kW for a five-point cluster around California’s largest metro, then the 90% real-roof factor; the assumptions, the ERA5 cross-check and the attribution are on the methodology page .
• Incentives: DSIRE — Database of State Incentives for Renewables & Efficiency, NC Clean Energy Technology Center. Verify current amounts and fund status before relying on them.
• Federal credit status: IRS, Residential Clean Energy Credit . See our 2026 energy tax credit guide .
• Payback model: shared with the solar savings calculator — 2.5%/yr utility inflation, 0.5%/yr degradation, federal credit $0.

California’s rate (33.6¢, EIA Table 5.6.A, July 2026 data (released Sep 2026)), export regime, production factor, installed cost and programs were last verified on 25 September 2026; California’s export credit resets on its tariff cycle and incentive budgets run out mid-year, so confirm current terms before acting. Not tax or financial advice.

Frequently asked questions

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

States with a comparable tariff picture

• Why is my electric bill so high? — Splits a bill jump into weather, rate and usage — with California’s own EIA rate history built in.
• Time-of-use rate simulator — Pacific Gas & Electric’s E-TOU-C schedule is preset from its own tariff sheet — see whether off-peak pricing beats your flat rate.
• Electricity rate tracker — California’s last 24 months of EIA rates, charted against the US average.
• Find your rate by ZIP — California averages hide utility gaps — look yours up from EIA-861 in three clicks.
• Net metering by state (2026 table) — Every state’s export regime with program, date and source — the rule behind California’s payback.
• Solar panel cost in New Hampshire — Same export regime at 26.6¢/kWh and a 17.1-year payback — the closest tariff comparison to California.
• Solar panel cost in Connecticut — Same export regime at 24.2¢/kWh and a 17.6-year payback — the closest tariff comparison to California.
• Solar panel cost in Vermont — Same export regime at 23.8¢/kWh and a 15.4-year payback — the closest tariff comparison to California.