In an early test of President Joe Biden’s promise that the transition to electric vehicles will create high-paying union jobs, employees at a battery plant in eastern Ohio have voted to join the United Automobile Workers union.

The outcome at the plant, owned by General Motors and the South Korean manufacturer LG Energy Solution, appears to create the first formal union at a major U.S. electric car, truck or battery cell manufacturing plant not owned entirely by one of the Big Three automakers. The result, according to a union statement early Friday, was 710-16 in two days of balloting.

“As the auto industry transitions to electric vehicles, new workers entering the auto sector at plants like Ultium are thinking about their value and worth,” said Ray Curry, the UAW president, in the statement.

The National Labor Relations Board said that it had received the tally and that it would move to certify the result if no objections were filed.

While existing plants owned by the three legacy U.S. automakers have maintained a union presence as they have shifted production to electric vehicles, the union must start from scratch at plants like the one in Ohio and joint ventures through which Ford is building battery factories in the South. Other electric vehicle companies, like Tesla, Rivian and Lucid, are also not unionized.

The autoworkers union has long worried about the transition to electric vehicles, first noting in a 2018 research paper that electric vehicles require about 30% less labor to produce than internal combustion vehicles. The paper also pointed out that the U.S. was falling behind Asian and European nations in establishing an EV supply chain.