The Indiana plant is a joint venture with South Korea's Samsung SDI, while the Canada plant will be built with South Korea's LG Energy Solution. Partners for the two additional plants are up for discussion, Stewart said. Stewart expects to make announcement for the third plant by the second quarter next year. Asked whether Stellantis was open to the workers at the joint-venture battery plants being represented by the United Auto workers union, Stewart said it was up to the workers but the company was open to the idea.