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tens of millions of people lost electricity

 across Spain, Portugal and part of France. Trains stopped in their tracks, and people were stuck in elevators, as southwestern Europe went without power for — in some cases — more than ten hours.

Immediately the finger-point began. Many people blamed solar and wind energy. Spain, one of Europe's front runners in renewable energy, gets about 

46 percent of its power from solar and wind

, according to the think tank Ember— sometimes more than 70 percent.

 "Could renewable energy be to blame for huge Spain blackout?"

And on the day of the outage U.S. energy secretary and former fracking executive 

Chris Wright went on CNBC to talk about the outage and criticized solar and wind

. "When you hitch your wagon to the weather," Wright said, "it's just a risky endeavor."

The idea that solar and wind are inherently risky and unreliable is 

a common talking point for critics of renewable energy

groups with ties to the fossil fuel industry

. It's false. When renewable energy is paired with large batteries or other forms of grid management, 

new report from an expert panel of European grid operators

 that for the first time in Europe, a voltage surge caused the massive outage. Voltage needs to remain within limits for an electrical grid to work. While many things went wrong, the problem was not a power grid with too much wind or solar, says 

, a senior energy analyst at Ember who was not involved in drafting the report.

"It contradicts the numerous claims that we've seen that an overreliance on renewables was the cause," Rosslowe says. "That is clearly not true."

But the misinformation about solar and wind energy causing the outage has had an impact. 

A new survey found that a majority of Spanish respondents

 believe at least one false narrative about the blackout, and the most common was that too much reliance on renewable energy was to blame.

using renewable energy to move away from polluting fossil fuels

. That's why it's so important to counter false narratives about solar and wind, says Philip Newell, communications co-chair of the 

"This content makes it seem more normal and feel more normal to hate on renewables," Newell says. "Even though they're a solution to climate change."

new report from the European grid operators' expert panel

 found multiple triggers shortly before the blackout.

First, oscillations, or sudden swings in power flow, hit the grid. It's still unclear what caused them. Spain's main grid operator took steps to control the oscillations, including sending less power to France. While these actions helped dampen the oscillations, they caused the voltage to surge upwards.

Voltage is like pressure in a water system. Just like it's key to have a certain amount of pressure for water to flow, there needs to be a certain amount of voltage to push electrons through a circuit. But voltage can't be too high, or it can cause short circuits or even fires.

When the voltage surged, transformers and power plants shut down. Antonio Gómez-Expósito, electrical engineering professor at University of Seville, says the outage shows that Spain needs more regulations around controlling voltage.

The expert panel report, like other recent analyses from 

, does not indicate that reliance on solar or wind power led to the outage. The panel will issue a final report next year.

Newell says the immediate accusations against renewable energy didn't surprise many people who study attacks on climate solutions. "We've known this has been a recurring issue," Newell says. "The big frame is that 'renewables are bad and we can't trust them'."

Renewable critics said blackout was caused by lack of "inertia" - it wasn't

When critics of renewable energy pointed the finger at solar or wind for causing the blackout, many used one word: 

Michael Shellenberger, a longtime critic of renewable energy and proponent of nuclear power with 1.4 million followers on X, said in a post the day of the blackout, "Renewables don't risk blackouts, said the media. But they did and they do… it's clear that too little 'inertia' due to excess solar resulted in system collapse."

Inertia is important to the electrical grid because it can help stabilize sudden fluctuations in a grid's frequency. Power plants that run on gas, coal or nuclear use large spinning turbines that create electricity and have inertia. More modern power resources, like wind, solar, and batteries, don't involve inertia, because they are digitally controlled. "Wind and solar plants either have no inertia or very little," Gómez-Expósito says, "but in return, they have infinitely greater response speeds."

There is no indication that a lack of inertia was the cause of the outage, Gómez-Expósito says. Spain's main grid operator, 

, released a report about the outage this summer. "The incident was not caused by an inertia problem," 

False claims that too much reliance on solar and wind caused the blackout in Spain and Portugal fit into broader attacks on renewable energy.

In winter 2021, a massive power outage hit Texas. Investigations ultimately found that the outage's cause was gas and coal plants that were forced offline because of freezing temperatures. But critics of renewable energy blamed solar and wind, says 

, professor of environmental studies and sociology at Brown University.

 "In 2021, again, there was uncertainty on what caused it, but immediately there were attacks on renewable energy," Roberts says. " Sort of exploiting, taking advantage of a crisis to make unfounded accusations."

Shortly after the power went out in Spain, Newell and his team from the

a survey about false narratives in the blackout's wake

. They surveyed 1,200 people in Spain and 1,200 in the United Kingdom – because many in the U.K. were also paying attention to the outage.

They found seven in ten in Spain and six in ten in the U.K. fell for at least one false narrative about the blackout causes. The most commonly believed false narrative was that the reliance on renewables was at fault.

Newell says while most of the survey respondents acknowledge the reality of climate change, misinformation led many to question the reliability of renewable energy.

Renewable energy plus batteries proving to be reliable in warming world

Solar and wind resources are already proving to be part of a reliable grid, says 

, chief executive of the California Independent System Operator, which assures the reliability of California's grid. California was powered by two-thirds clean energy in 2023, the latest year for which data is available.

pairing solar and wind energy with massive batteries

. Batteries are especially important with solar, as they absorb excess solar energy during the day, and send it back into the grid after the sun sets and evening demand stays high, Mainzer says.

Mainzer says older power sources have their own problems. California faces a loss of hydropower during droughts. And Mainzer says, gas power plants have some reliability challenges, too.

" During the kind of heat waves we've seen in recent years, the natural gas plants can come under some significant strain," Mainzer says. "They have to run harder, they mechanically get challenged, and we tend to see a higher outage rate amongst the gas fleet when the temperatures are really, really hot."

Mainzer says the use of solar plus batteries helped prevent blackouts in California in 2022 when there was a heatwave hitting much of the state and gas plants were under performing. 

Texas' main grid operator, ERCOT, has also said that an increase in solar and battery storage has helped the state avoid power outages

 — especially as the state sees unexpected outages with coal plants.

As the planet sees longer and more intense heat waves with global warming, primarily caused by humans burning fossil fuels, Mainzer says solar combined with batteries, both of which perform well in the heat, will be important to keep the lights on.

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Julia Simon

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When millions lost power in Spain and Portugal this spring, some were quick to blame too much solar and wind power. That wasn't the cause, but the misinformation had an impact.

After Spain’s blackout, critics blamed renewable energy. It’s part of a bigger attack

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