By Nora Eckert

DETROIT (Reuters) – The United Auto Workers union is petitioning the National Labor Relations Board to hold an election at a Ford Motor (NYSE:F) joint-venture battery plant in Kentucky, the union said in a release Wednesday.

The BlueOval SK plant, owned by a partnership of South Korea’s SK On and Ford, is the latest battery battleground for the union as it seeks to grow its decreasing membership and secure jobs as the industry electrifies.

UAW President Shawn Fain has sought to expand on a historic win last year at a Volkswagen (ETR:VOWG_p) plant in Tennessee. The labor group hasn’t won a significant vote since, suffering a defeat at a Mercedes plant in Alabama in May.

The UAW invested $40 million last year to organize non-union automakers across the United States, a push that included companies such as Tesla (NASDAQ:TSLA) and Toyota (NYSE:TM).

Battery plants partly owned by Detroit’s automakers were a major sticking point during the union’s six-week strike against Ford, General Motors (NYSE:GM) and Jeep-maker Stellantis (NYSE:STLA) in late 2023.

The union previously notched victories with Ultium Cells, a joint venture between GM and LG Energy Solution at plants in Ohio and Tennessee. In June 2024, the union reached a tentative contract at an Ohio GM battery plant, and in September, GM agreed to recognize the union at an Ultium plant in Tennessee.

Companies can agree to voluntarily recognize workers once a majority sign cards supporting unionization, which is what happened with the Ultium facility in Tennessee. In cases where the company does not agree to do this, there is an election, overseen by the NLRB, where workers must vote by majority to unionize.

A union can file a petition for such an election after collecting signatures from at 30% of workers, according to the NLRB. The UAW said in November that a “supermajority” of workers at the Kentucky facility signed cards indicating their support for joining the union, without specifying the percentage.

An election date has not yet been set, but it typically takes several weeks between when the union files for an election and when it is held.

While the union got support from President Joe Biden, including in-person at one of its picket lines during the strike, Fain and president-elect Donald Trump have a more contentious relationship. The incoming president has said the union leader should be fired, and Fain said before the election that if Trump won, it would be a “complete disaster for the working class.”

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