Batteries that have become essential in the face of heat waves

In his Long Beach center, occupied by rows of thousands of batteries resembling a computer server farm, Weikko Wirta watched his 400-megawatt facility, one of the largest in the state, go into full swing during the heat wave. “The batteries intervened […] and played an essential role” during the last heat wave, explains to AFP the director of operations of the electricity supplier AES, in charge of this new factory since 2021.

Thanks to them, the company was able to store the solar energy produced during the day and redistribute it in the evening to fill the gap between 4-5 p.m. and 10 p.m., when the drop in photovoltaic supply at sunset and the record demand for air conditioning risked causing a collapse of the electrical network.

In August 2020, a brutal heat wave affecting the entire Western United States forced California, a pioneer in renewable energy, to cut power to 800,000 homes and businesses during certain time slots for two days. Unheard of for almost 20 years.

Faced with the return of extreme temperatures this year, such voluntary cuts were narrowly avoided in early September, thanks in particular to the race launched to meet California’s climate objectives. The state is aiming for 100% carbon-neutral power generation by 2045. Between 2020 and 2022, it increased its battery energy storage capacity 10-fold, according to its energy commission.

On September 5, at the peak of the heat wave, the batteries were able to produce 3,300 megawatts in the evening, according to the California power grid regulator ISO. “That’s larger than the Diablo Canyon nuclear plant, which is the largest power plant in the state and produces about 2,200 megawatts.”analyzes Mike Ferry, a researcher at the University of San Diego.

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Technology of the future

Barely perceptible during the previous heat wave in 2020, this technology has established itself as a key to allowing the State to avoid power cuts, by providing the energy margin missing from the network. She would represent “the future of what our electricity grid will look like”insists Mike Ferry.

California is still very dependent on natural gas and had to import electricity from other American states to withstand the last heat wave. The authorities have also increased alerts to reduce demand. Several evenings in a row, residents were asked not to set the air conditioning below 25.5°C or to avoid charging their electric vehicles during the most critical time slot.

What relaunch the debate on the energy transition in the United States. Many Republican officials have mocked the Democratic state, attributing the weakness of California’s grid to renewable energy and its intermittent production. “The forced march energy transition endangers the reliability of the electricity network”tackled on Twitter Kevin McCarthy, the leader of the conservative party in the House of Representatives. “Instead of criticizing renewable energy, we should highlight the value of battery storage”, replies Eric Fournier. A researcher at UCLA, the university underlines the interest of this technology capable of storing clean energy produced by solar and wind power. As heat waves and extreme weather events are set to become more frequent with global warming, “Tackling the source of the problem by stopping greenhouse gas emissions is the only rational solution”he pleads.

For him, the other lesson of this heat wave remains the ease with which Californians have voluntarily reduced their use of electricity in the evening. This observation is all the more interesting since the State is currently developing programs to reward consumers who limit their consumption. Rather than seeking to equip the network with enough batteries to handle transient peaks in demand, “paying people not to demand electricity for a small number of hours might be a better option in many cases”.

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