Solar Panels in California (2026): Cost, NEM 3.0 and Payback

How California’s NEM 3.0 Changes Your Solar Savings

NEM 3.0 makes self-consumed solar far more valuable than exported solar. California’s Net Billing Tariff, in effect for new PG&E, SCE and SDG&E customers since April 15, 2023 (CPUC Decision D.22-12-056), credits exports at a fraction of the retail rate based on hourly avoided-cost values. Systems interconnected under NEM 2.0 kept their retail-rate export credits for their legacy period.

Our model captures this with a 0.60 bill-offset factor: a right-sized solar-only system removes about 60% of the retail value of its production from your bill in year one, compared with 87% in our model of full retail net metering. Both factors are modeling assumptions, not published tariff values; the gap reflects low export credits and fixed charges.

Household patterns matter a lot. A household at home during the day that uses most of its solar directly will beat the 0.60 average; a household away all day that exports most midday production will fall short of it. This is why many new California systems are paired with batteries: storing midday solar and using it during the evening time-of-use peak avoids buying the most expensive power of the day.

Before sizing a battery, look at your hourly usage from your utility account. A household that already self-consumes most of its solar gains less from storage than one exporting half of its production. The solar net metering calculator can model your export share under NEM 3.0, and our guide to solar panels in Texas shows how a market without statewide net metering compares.

Solar Payback Period and Long-Term ROI for California Homeowners

About 8.9 years for a 7 kW solar-only system at $21,000, based on year-one savings of about $2,370. Over 25 years, the model projects about $59,800 in net savings, even without a federal credit.

Source: GreenEnergyCalc standard model; see methodology.

Chart summary: The curve starts at about minus $18,600 after year 1 and crosses zero during year 9 once 3% annual rate growth is included. Savings keep compounding afterward, ending near $59,800 in year 25, but they depend on the 0.60 offset and the rate-growth assumption holding.

A household with no solar and an average first-year bill of about $329 a month ($3,949 a year, equal to our example home’s 12,152 kWh at 32.5 cents) would pay about $144,000 in electricity over 25 years if rates rise 3% a year. With solar, remaining bills plus the system cost total about $84,200. For comparison, the same system completed by Dec 31, 2025 with the now-ended 30% credit would have cost $14,700 and paid back in about 6.2 years.

Chart summary: The solar scenario includes the $21,000 purchase price plus about $63,200 in remaining utility bills. The gap is a model estimate for one example home, so enter your own bill and quotes into the calculators below.

Adding a battery changes both sides of the equation: it adds upfront cost, but raises self-consumption and may qualify for SGIP. Whether it shortens or lengthens your overall payback depends on your rate plan, evening usage and rebate category, so model it with itemized quotes rather than assuming. The model assumes rates rise 3% a year; California utilities’ rates have risen faster over the past decade, which would improve these results if the trend continued. Homeowners in other high-rate states such as Massachusetts and Connecticut can compare their own paybacks. Build a 25-year projection with the solar ROI calculator.