Ford Motor Co. is repackaging a previously announced $900 million manufacturing investment in the Detroit area, boosting the number of jobs added from 850 to 900.

Most of the new workers will build a new generation of electric vehicle at Ford's existing factory in Flat Rock, south of Detroit, which will see an $850 million investment.

The company also plans a roughly $50 million autonomous vehicle manufacturing center near Detroit where workers will add the self-driving software to autonomous vehicles that will be built at Flat Rock. The automaker did not disclose a location or jobs estimate for its new autonomous vehicle center. Production is expected to begin in 2021, with the vehicles being used commercially rather than sold to consumers.

Joe Hinrichs, Ford's president of global operations, also dropped a hint on Ford's plan to arrange for the supply of batteries to power its new electric vehicles. The company will procure them locally, he said, while declining to comment in detail on whether the shift to plug-in autos will hurt employment at its powertrain factories.

In January 2017, Ford announced it would invest $700 million at the Flat Rock plant to make hybrid, electric and autonomous vehicles. Later that year, the company moved an all-electric SUV to a factory in Mexico, freeing more space at Flat Rock to build future electric and self-driving cars and adding $200 million to the investment. At that time, it was promising 850 new jobs.

Wednesday's announcement comes just after a three-day string of venomous tweets by President Donald Trump condemning crosstown rival General Motors Co. for shutting down its small-car factory in Lordstown, Ohio, east of Cleveland. Trump demanded that GM reopen the plant, criticized the local union leader and expressed frustration with GM CEO Mary Barra.

Hinrichs wouldn't directly answer questions about whether Trump's actions influenced the moves, but said Wednesday that the investment is part of the company's plans to run its business more efficiently. "It's a better plan for how we allocate capital in a more efficient way," Hinrichs told Automotive News.

The timing of the announcement was due to requirements that parts suppliers be notified of manufacturing plans, Hinrichs said.

"We've been running our business this way for 10-plus years," he said in an interview with the Associated Press. Hinrichs said Ford is aware that auto manufacturing gets a lot of attention these days, and said he is proud Ford employs more workers represented by the United Auto Workers union than any other manufacturer. A union spokesman confirmed that statement.

The company intends to add a second shift at Flat Rock to build an electric vehicle, which Hinrichs would not detail. Ford said production would begin in 2023.

Hinrichs said company projections of electric vehicle sales made it clear that Ford needed more space to build them. "We had to change some of our plans," he said, adding that the new plan is a better use of capital spending dollars.

Ford said it expects more electric vehicle sales in the coming years largely because millennials, the fastest-growing segment of the U.S. population, are more open to buying them. The company also sees higher gasoline prices and stronger emissions regulations in the future as well as more electric vehicle charging stations.

The Flat Rock plant now builds the Mustang muscle car and the Lincoln Continental luxury car, which has a murky future because Ford has announced it intends to stop selling all cars in the U.S. but the Mustang. It plans to transfer 650 workers from Flat Rock to other factories in April.

Ford CEO Jim Hackett is leading an $11 billion overhaul of the automaker, which saw net income fall by more than half last year. Ford's restructuring will involve cutting thousands of salaried jobs and closing factories in unprofitable overseas operations.

— Automotive News and Bloomberg contributed to this report.