Is solar worth it in California?

California gets excellent sunshine — about 5.5 peak sun hours a day — and residential electricity runs around $0.31/kWh. For a typical $150-a-month power bill, that points to roughly a 3.6-kW system costing about $10,846 — with no federal tax credit, which ended for installations completed after December 31, 2025 — paying for itself in about 6.0 years and netting on the order of $50,518 over 25 years. Your own numbers will differ — the calculator above uses your real bill.

California's high electricity rates make solar savings large, but NEM 3.0 slashed the credit for power you export to the grid — so payback is best if you use most of your solar as you generate it, or pair it with a battery. Even so, high rates keep the math attractive.

What changes the math in California

• Your electricity rate — the more you pay per kWh, the more each solar kWh saves you. California sits at about $0.31.
• Sun hours — more sun means a smaller, cheaper system covers the same usage. California averages ~5.5 hours.
• Net metering / buyback — how your utility credits power you export swings the payback; check your specific utility's current terms.
• Install cost — quotes vary by installer and roof; the calculator defaults to a typical $/watt you can override.

California: the rules that actually decide your payback

Who your utility is, and why it matters

Three investor-owned utilities cover most of the state — Pacific Gas & Electric in the north, Southern California Edison across the centre and south, and San Diego Gas & Electric in the far south — and they are the ones the CPUC regulates. A large minority of Californians are instead served by municipal utilities such as LADWP and SMUD, or by a Community Choice Aggregator riding on an IOU's wires. That distinction is the first thing to establish, because municipal utilities set their own solar rules and are not bound by the CPUC decisions everything below describes.

What your exported power is worth

California moved off retail net metering. Systems interconnecting under the current Net Billing Tariff — universally called NEM 3.0 — are credited for exported power at avoided-cost values that vary by hour and season rather than at the retail price you pay. In practice a midday export is worth a fraction of a summer-evening one, and far less than the retail rate it would have offset. Systems interconnected under the earlier NEM 2.0 rules keep those terms for a legacy period measured in years, which is why the interconnection date on an existing system is worth knowing before you buy a house with panels on it.

The California incentive layer

There is no broad California income-tax credit for residential solar. The meaningful state programme is the Self-Generation Incentive Program (SGIP), which pays toward energy storage rather than panels, with substantially higher rates for equity-eligible households and for customers in high fire-threat districts. Property-tax treatment is favourable: an active solar energy system is generally excluded from reassessment, so adding one does not by itself raise your property-tax bill.

Battery and self-consumption

California is the state where storage changes the answer most. Because exports earn well below retail while evening consumption is billed at the highest rates, the value is in shifting your own generation into your own evening rather than selling it. A battery raises upfront cost significantly and can still improve payback where the retail-versus-export gap is wide — but that is a calculation to run on your actual tariff, with SGIP applied, not an assumption to accept from a salesperson.

What to check on a California quote

• Establish which tariff you would interconnect under, and get it in writing — NEM 2.0 legacy status and the Net Billing Tariff produce very different savings from identical hardware.
• Ask what hourly export values the savings estimate assumed. A model that credits exports at retail is not modelling California.
• Ask which retail rate schedule they modelled you on, and whether it is the one you are actually on today.
• If storage is quoted, ask whether SGIP has been applied, at which tier, and whether the incentive is assumed or confirmed.
• Confirm whether your provider is a CPUC-regulated IOU or a municipal utility — if it is municipal, most of the above does not apply to you.

Programme and tariff detail above is summarised from CPUC — Net Billing Tariff (NEM 3.0). Last reviewed 20 August 2026 by SolarDime editorial. These rules change — confirm the current terms with your utility and the regulator before you sign.