The Trump administration announced Saturday that it had approved new fuel-economy standards, reversing the previous administration’s mandate for a rapid transition to electric vehicles. The administration says the rules will give automakers such as Stellantis more flexibility in the vehicles they produce and could save American families thousands of dollars on new-vehicle purchases.

The policy shift will affect Stellantis’s long-term product planning and investment in electrification.

No immediate market reaction was available because the announcement came over the weekend. Shares of Stellantis (STLA) and other legacy automakers, including General Motors, had already gained momentum ahead of the news, closing about 3% higher on Friday, September 25.