Panels supplied 51% of California's power for all of May

Solar covered more than half of California's electricity for a full month, the first major economy to cross that line.

Solar produced 51% of California's electricity in May — the first full month the state has spent above the halfway mark. The figure counts utility-scale plants and the state's large rooftop fleet together. The think tank Ember calls California the first major economy to clear 50% for a month; Hungary reached 47% in June 2025, with a far smaller economy behind it.

Batteries are why this reads as a grid statistic rather than a midday curiosity. The California Independent System Operator now manages 16 gigawatts of storage, enough that batteries routinely cover more than a quarter of the state's demand for part of the night. A decade ago that fleet was 61 megawatts and solar's best month — also a May — came to 17%. Solar has now outproduced natural gas, the only fossil fuel California burns at appreciable levels, in every month of 2026 through May.

This is the abundance case with the projection removed. The generation costs almost nothing to run once built, and the storage moves it to the hours people actually want it, which is the combination that pushes a fuel bill out of a major economy's power system rather than merely trimming it.

One month is one month, and May is the kindest month for it — sunny, mild, and light on air-conditioning demand. The test is whether high-summer months with heavy evening cooling load also hold above half, and whether the other states and countries the analysis expects to follow actually do.

Source: Canary Media