California’s gas plants once ruled the grid like a backup generator nobody could live without, but solar and batteries are now pushing them aside faster than anyone predicted as peak demand hits record lows and the state briefly exports more power than it consumes
Image generated with artificial intelligenceCalifornia’s gas plants are losing ground to solar and batteries faster than predicted
On a sweltering August afternoon in 2026, California’s electricity grid hit its yearly peak demand — the kind of moment that, not long ago, would have sent grid operators scrambling to fire up natural gas plants across the state.
Something different happened instead.
Researcher Jonathan Koomey says the displacement of gas by solar and batteries has become “pretty obvious” to people who study energy systems closely.
The shift had been building for over a decade, quietly reshaping how California keeps its lights on. But in recent years it has moved faster than nearly anyone in the energy industry anticipated — and the numbers behind it are hard to ignore.
A peak day that looks nothing like it used to
On August 26, 2026, California’s grid hit its yearly peak at 5:55 p.m. — 46,015 megawatts. That sounds like a lot. But compare it to September 6, 2022, when the all-time record reached 52,061 megawatts, and the gap tells its own story. The grid is serving a hot, growing state with notably less strain than it did just four years ago.
The supply picture on that 2026 peak day was equally striking. On the CAISO grid, the line for renewable energy towered above natural gas for most of the day. Batteries — shown charging below zero through the midday solar surplus — swung sharply upward just after sunset, covering the evening demand spike that once belonged almost exclusively to gas peakers.
At certain moments, California actually exported more power than it consumed. A state that used to lean heavily on imports during heat emergencies was, briefly, a net supplier to the region.
Twelve years of decline — and an accelerating retreat
The 2026 peak day didn’t come out of nowhere. California’s gas-fired electricity generation reached its high point in 2014 and has declined in eight of the eleven years since. The retreat has been uneven but persistent — and recently it picked up speed in a way that surprised even close observers.
Gas use fell 15% in 2025 compared to 2024. Then, in the first half of 2026, it dropped another 26% compared to the same period in 2025, according to U.S. Energy Information Administration data. Those aren’t incremental numbers. California’s share of total U.S. gas consumption for electricity generation fell from 10% in 2014 to just 4% in 2025 — moving in the opposite direction from the broader national trend. Coal has already faded to near zero in California’s electricity mix, and gas is following a similar trajectory, just stretched across a longer timeline.
How solar and batteries replaced the peaker plant
The mechanism behind this shift is fairly straightforward, even if the scale of it isn’t. California built an enormous amount of utility-scale solar over the past decade, creating a reliable midday surplus of cheap power, then layered in battery storage to capture that surplus and dispatch it later — right when demand peaks in the early evening.
“The key story here is batteries,” said Ed Smeloff, a longtime energy analyst who has tracked California’s grid closely. Batteries essentially do what peaker plants used to do, but without burning anything.
Peaker plants are the primary casualty. Designed to run only a few hours during demand spikes, they’re the least efficient and most expensive gas units on the grid. As batteries take over that role, peakers run less and less. Rooftop solar and home battery systems have compounded the effect by reducing overall demand and shrinking the peak that gas plants once had to cover.
Policy, regional grids, and a wind farm in New Mexico
None of this happened by market forces alone. California’s carbon-reduction laws provided the policy framework that made investment in solar and storage financially viable. The overall direction, as Smeloff put it, has been clear even when specific rules created friction — rooftop solar net metering policies, for instance, have at times hurt the very industry they were meant to support.
Regional grid coordination has also improved. Hydropower from Oregon and Washington is now more accessible as Western grid operators have gotten better at sharing resources across state lines. Then there’s the SunZia wind project in New Mexico — the largest wind farm in the United States — whose output flows into California via a dedicated transmission line under a firm contract, adding yet another layer of clean supply.
A model for other states — and a national counterpoint
Researcher Jonathan Koomey says the displacement of gas by solar and batteries has become “pretty obvious” to people who study energy systems closely. The public, he suggests, hasn’t yet grasped the scale of what’s happened in California.
Texas offers a parallel. Smeloff points to it as another state where the same solar-and-battery formula is already reducing reliance on dirtier power sources. The national picture, though, cuts the other way — the Trump administration has moved to expand natural gas production, and new gas peaker plants are in various stages of planning or construction across the country.
California ISO spokeswoman Jayme Ackemann notes that while the decline in gas use is real, gas still provides reliability value simply by being available, even when it runs less. What comes next will depend on whether battery storage continues to scale, whether regional grid coordination deepens, and whether other states adopt the policy frameworks that made California’s shift possible.
Carlos is an engineer with strong expertise in technical and industrial topics. He previously worked at international companies such as Siemens and is multilingual.
