General Motors announced Thursday a $1 billion investment into its Mexico manufacturing facility. The facility will be converted to produce battery-electric vehicles and components starting in 2023.

The Ramos Arizpe Assembly Plant currently produces the Chevrolet Blazer and Equinox, along with some engine and transmissions. Upgrades to the plant are already underway in the form of a new high-tech paint shop that will go live in June.

GM is receiving criticism from the United Auto Workers (UAW) stateside over the announcement, calling the move a ‘slap in the face’ of its members.

“At a time when General Motors is asking for a significant investment by the U.S. government in subsidizing electric vehicles, this is a slap in the face for not only UAW members and their families but also for U.S. taxpayers and the American workforce,” said UAW Vice President Terry Dittes in a statement.

Rumors have swirled for some time that GM would ultimately convert the Ramos Arizpe facility to produce EV’s. It’s now on a growing list of GM plants that will build EV’s based on its Ultium battery platform. Thus far, GM has announced facilities in Michigan, Ohio and Tennessee as EV plants. GM is also going to build battery-electric delivery vans at its facility in Ingresoll, Ontario.

In total, GM has announced around $9 billion of investment to build EV’s in the U.S. and says it will add around 9,000 UAW jobs.

GM is not confirming which EV models will be built in Mexico. The plant is rumored to start building two Chevrolet crossovers in 2023. Rumors have also surfaced that a planned Honda EV crossover could be built by GM at the plant as well.