California Produced More Than Half Its Electricity From Solar In May, A World First

California generated more than half of its electricity from solar power in May 2026, becoming the first large-scale power system in the world ever to surpass 50 percent solar generation for an entire calendar month, according to an analysis from the UK-based energy think tank Ember. The figure covers both utility-scale solar farms and rooftop panels, and represents a milestone that energy researchers describe as a structural shift rather than a weather-dependent anomaly. May was the right month for it: neither cold enough to drive heavy heating demand nor hot enough to trigger air conditioning spikes, meaning total electricity demand was lower than usual and solar, which was producing at full spring capacity, could meet a larger share of what the grid actually needed. For the first five months of 2026 combined, California also produced more electricity from solar than from natural gas for the first time in its history, and analysts believe this could be the first full year that solar beats gas in the state's annual electricity mix, reversing a relationship that had defined California's energy system for decades.

The milestone was enabled not only by the growth of solar capacity itself but by the rapid expansion of battery storage across the state, which has fundamentally changed the economics and reliability of high-solar grids. Batteries now absorb the midday surplus of solar energy that would otherwise be wasted, storing it and releasing it into the grid during the evening hours when demand peaks and the sun is down, extending solar's effective reach far beyond the hours when it is actually generating. Ember analyst Nicolas Fulghum described battery storage as having transformed California's power system, and said the ability to shift huge amounts of solar from midday into the evening peak is what makes this level of solar penetration possible. The May numbers also reflect the beginning of power deliveries from the SunZia wind project in New Mexico, which started sending wind electricity to California in April and reduced the overnight need for natural gas generation. Under legislation signed in 2018, all of California's electricity is required to come from clean sources by 2045. A grid that produced more than half its power from the sun for an entire month in 2026 is on a trajectory to make that deadline feel less like an aspiration and more like a formality.

Source:https://www.spokesman.com/stories/2026/jul/31/california-produced-over-half-its-may-electricity-/