MOSS LANDING, Calif. — Hundreds of people were ordered to evacuate and part of Highway 1 in Northern California was closed when a major fire erupted Thursday afternoon at one of the world’s largest battery storage plants.

As the fire sent up towering flames and black smoke and showed no sign of easing by Thursday night, about 1,500 people were instructed to leave Moss Landing and the Elkhorn Slough area, The Mercury News reported.

The Moss Landing Power Plant, located about 77 miles (about 124 kilometers) south of San Francisco, is owned by Texas-company Vistra Energy and contains tens of thousands of lithium batteries. The batteries are important for storing electricity from such renewable energy sources as solar energy, but if they go up in flames the blazes can be extremely difficult to put out.

“There’s no way to sugar coat it. This is a disaster, is what it is,” Monterey County Supervisor Glenn Church told KSBW-TV. But he said he did not expect the fire to spread beyond the concrete building it was enclosed in.

There were fires at the Vistra plant in 2021 and 2022 that were caused by a fire sprinkler system malfunction that resulted in some units overheating, according to The Mercury News.

It was unclear what caused this latest fire. Vistra said in a statement that after it was detected, everyone at the site was evacuated safely. After the fire is out, an investigation will begin.

“Our top priority is the safety of the community and our personnel, and Vistra deeply appreciates the continued assistance of our local emergency responders,” Jenny Lyon, a spokesperson for Vistra, said in a statement.

North Monterey County Unified School District announced that all schools and offices would be closed Friday due to the fire.