Bosch will making electric motors for Rivian at its plant in Charleston, South Carolina. They already have plans to expand their facility in 2023.

Bosch on Tuesday announced the start of EV motor production at its Charleston, South Carolina, facility, with expansion plans already on deck for 2023.

Production began earlier this month in a 200,000-square-foot section of an existing building at the Charleston site, Bosch said in a press release. The assembly area includes production of motor rotors and stators—the main components—as well as final assembly of the motors, according to the company.

Bosch plans to add 75,000 square feet to this building in response to an uptick in business, and is spending $260 million on that addition, which is scheduled to be operational by the end of 2023.

A spokesperson confirmed to Green Car Reports that initial production is going to Rivian, while the expansion will serve additional customers the company does not want to name yet. Rivian stands out among EV-only automakers as one of the few outsourcing electric motors. The company views this as a cost-saving measure, although it is shifting to in-house motor tech.

Bosch said motors assembled in Charleston can range in power from 50 kw to 500 kw (67 hp to 670 hp) and from 110 lb-ft of torque to 737 lb-ft. They also feature a voltage range of up to 850 volts, with a claimed 98% efficiency.

Opened in 1974, the facility is a key part of Bosch's pivot away from internal-combustion tech. The company noted that the building now used for electric motor production was previously used to make diesel-engine components.