The California grid ran on 100% renewables with no blackouts or cost rises for a record 98 days

A new study published in the journal Renewable Energy uses data from the state of California to demonstrate that no blackouts occurred when wind-water-solar electricity supply exceeded 100% of demand on the state’s main grid for a record 98 of 116 days from late winter to early summer 2024 for an average (maximum) of 4.84 (10.1) hours per day.

Compared to the same period in 2023, solar output in California is up 31%, wind power is up 8%, and batteries are up a staggering 105%. Batteries supplied up to 12% of nighttime demand by storing and redistributing excess solar energy.

And here’s the kicker: California’s high electricity prices aren’t because of wind, water, and solar energy. (That issue is primarily caused by utilities recovering the cost of wildfire mitigation, transmission and distribution investments, and net energy metering.)

In fact, researchers from Stanford, Lawrence Berkeley National Laboratory, and the University of California, Berkeley found that states with higher shares of renewable energy tend to see lower electricity prices. The takeaway – and the data backs it up – is that a large grid dominated by wind, water, and solar is not only feasible, it’s also reliable.

The researchers concluded:

Despite the rapid growth and high penetration of [wind-water-solar] WWS, the spot price of electricity during the period dropped by more than 50% compared with the same period in the previous year, and no blackouts occurred, giving confidence that the addition of more solar, wind, and batteries should not be a cause for concern.

Mark Z. Jacobson, co-author of the paper and professor of civil and environmental engineering and director of the atmosphere/energy program at Stanford University, explained in an email to Electrek:

This paper shows that the main grid in the world’s fifth-largest economy was able to provide more than 100% of the electricity that it used from only four clean renewable sources: solar, wind, hydroelectric, and geothermal, for anywhere from five minutes to over 10 hours per day for 98 out of 116 days during late winter, all of spring, and early summer, as well as for 132 days during the entire year of 2024, without its grid failing.

The growth of solar, wind, and battery storage, in particular, resulted in fossil gas use dropping 40% during the 116-day period and 25% during the entire year. In comparison with 2023, solar, wind, and battery capacities increased significantly, with batteries doubling in capacity.

The paper also shows that high electricity prices in California have nothing to do with renewables; in fact, without renewables, prices would have been higher.

In fact, 10 of the 11 US states with higher fractions of their demand powered by renewables have among the lowest US electricity prices.

Instead, in California, the spot price of electricity dropped by over 50% during the period of interest between 2023 and 2024, indicating it was easier to match demand with supply with the increase in renewables and batteries in 2024.

Read more: New CA smart grid law will help solar and fix the grid by… simply replacing wires

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