Solar Is Now California's #1 Power Source: What It Means

In the 12 months ending April 2025, something happened that energy analysts had been predicting for a decade: solar passed natural gas as California's largest source of electricity. Solar produced 83.1 terawatt-hours in that period, against 81.6 TWh from gas, according to the energy think tank Ember.

That was only the beginning. California solar power kept growing through 2025 and into 2026, and in May 2026 it supplied more than half of the state's electricity for an entire month. No major economy had done that before.

For homeowners, the headline raises a fair question. If the grid is running on cheap sunshine, why do utility bills keep going up? This guide covers what changed, why rates have not followed, and what it means if you are thinking about solar for your own home.

How Solar Overtook Gas in California

A decade ago, gas was the backbone of California's grid. In 2014, solar supplied about 7% of the state's electricity and gas close to 59%. Since then, solar's share has grown almost every year while gas has declined.

Two things drove the shift. First, solar capacity kept growing, reaching about 25 gigawatts of utility-scale solar on the state grid by April 2026, plus a similar amount on homes and businesses. Second, batteries changed when that solar could be used.

Solar alone peaks at midday and disappears at sunset, right when demand climbs. Batteries solve that. According to the U.S. Energy Information Administration, battery capacity on California's main grid grew 79% in two years, to about 16 GW by April 2026, and battery output in early 2026 was triple the same period of 2024. Batteries now charge on midday sun and discharge into the evening peak, taking over hours that used to belong to gas plants.

California Solar Power Milestones, 2014 to 2026

Here is how the shift played out, from the first small share to the first majority-solar month.

The May 2026 record came from a mix of factors: more batteries, mild spring temperatures that kept air conditioning demand low, and a new wind project in New Mexico that began sending power to California in April. Imports helped too. The EIA reports that California roughly doubled its electricity imports in early 2026, including hydropower from the Pacific Northwest, which further reduced the need to run in-state gas plants. Summer heat waves still bring gas plants back online, so gas has not disappeared. But the trend is clear, and 2026 could be the first full calendar year that solar out-produces gas.

When California Has More Solar Than It Can Use

Leading the grid comes with a side effect. On sunny spring days, California now produces more solar power at midday than it can use, store or send to neighboring states. When that happens, the grid operator tells solar farms to cut output, a practice called curtailment.

According to the EIA, the California Independent System Operator (CAISO) curtailed 3.4 million megawatt-hours of wind and solar in 2024, up 29% from 2023. Solar accounted for 93% of it, mostly in spring, when sunshine is strong and air conditioning demand is still low. Meanwhile, solar output keeps setting records. CAISO's solar generation peaked at 21,290 megawatts on September 9, 2025.

Curtailment does not mean solar is failing. It means the grid now has more midday power than it needs, and the next challenge is moving that energy to the hours when people use it most. That is exactly what batteries are doing, on the grid and increasingly at home.

It also explains a lot about how rooftop solar is valued today. When the grid is already throwing away midday solar, the power your panels export at noon is worth very little to it. The power you use in the evening is worth much more.

Why Your Electric Bill Keeps Rising Anyway

You might expect all this cheap solar to lower rates. It has not, because most of what you pay for is not the power itself.

Much of your bill covers poles, wires, transmission lines and wildfire costs. SCE's average residential rate reached 34.4 cents per kWh in June 2026, and SDG&E's reached 45.5 cents. According to the California Public Advocates Office, SCE rates rose about 101% and SDG&E rates about 97% from January 2016 to June 2026, while general inflation rose about 42%. Wildfire mitigation and recovery now make up about 14% of both utilities' revenue.

Our breakdown of rising electricity costs in Southern California covers where the money goes.

In other words, the grid's energy is getting cleaner and cheaper to produce, but delivering it keeps getting more expensive. Rooftop solar cuts the part of your bill you can control: the kilowatt-hours you buy.

What a Solar-Heavy Grid Means for Rooftop Solar

The same midday surge that set records also changed how rooftop solar pays off.

Midday exports are worth less. When the grid already has more solar than it needs at noon, extra solar has little value. That is why SCE, PG&E and SDG&E customers who went solar after April 2023 are on the Net Billing Tariff, often called NEM 3.0, where exports typically earn about 5 to 8 cents per kWh.

Evening power is worth the most. Utility time-of-use peaks run from 4 to 9 PM, exactly when solar fades. Power you use yourself, or store and use after sunset, saves you the full retail rate.

Batteries now matter at home, too. Just as grid batteries shift solar into the evening, a home battery does the same for your house. For SCE and SDG&E customers, pairing panels with a battery is usually the way to get the most from a new system. Our guide on whether batteries are worth it for solar in California walks through the numbers.

LADWP is different. Homes served by LADWP, including most of the City of Los Angeles, are not on NEM 3.0. LADWP runs its own net metering program that credits exports at the retail energy price, so a battery there is mainly for backup. Our Northridge solar guide explains how that works.

What About the Federal Tax Credit?

The 30% federal credit for homeowners who buy their system (Section 25D) ended on December 31, 2025. Systems purchased in 2026 do not qualify.

Leases and power purchase agreements work differently. The solar company owns the system and can still claim a commercial credit under Section 48E if the system is placed in service by the end of 2027, and some of that value may show up in lower monthly payments. Buying and leasing each have trade-offs, so compare the total 25-year cost of both before deciding.

Even without the federal credit, California solar power still pays for many homes, because the savings come from avoiding high retail rates, and those rates are the highest they have ever been.

Is Rooftop Solar Still Worth It in California?

For many homes, yes, but the right system looks different than it did five years ago. Here is what makes a system pay off on today's grid.

Size it to your real usage. Under NEM 3.0, oversizing to export extra power no longer pays. A system sized to what your home actually uses, based on a full year of bills, gives the best return.

Plan for the evening. If you are on SCE or SDG&E, consider a battery or at least a design that leaves room to add one. Our 2026 home solar battery comparison compares the leading options.

Choose equipment that lasts. A system you keep for 25 years needs panels and a warranty from a company that will be around to honor it.

Know your utility. SCE, SDG&E and LADWP customers face very different export rules, so the same system can have a very different payback depending on who serves your home.

How US Power Designs Systems for Today's Grid

US Power designs every system around how you use power now, not how solar was sold five years ago.

Each proposal starts with a 12-month bill analysis, so your system is sized to your actual usage and rate plan, whether you are on SCE, SDG&E or LADWP. As a factory-direct Qcells partner, US Power installs Qcells panels and storage at 15 to 20% below typical market pricing, with no distributor markup. You can see how the Qcells warranty process works before you buy.

Every system includes a 25-year comprehensive warranty covering panels, installation and workmanship. US Power is CSLB-licensed, has more than 200 five-star Google reviews, and typically completes installation within 3 to 4 weeks once your design is approved.

The Bottom Line on California Solar Power

Solar's rise to the top of California's grid is a real milestone, but it does not mean your bill will fall on its own. Delivery costs keep climbing, and the value of solar has shifted from midday exports to the power you use yourself in the evening. California solar power works best at home when the system is sized to your bills and planned around your utility's rules. Run your address through our solar calculator to see what your roof could produce.

Ready to see your numbers? Get your free solar quote.