President Joe Biden will sign an executive order on Wednesday leveraging the federal government’s buying power to slash its carbon emissions by 65% by 2030 and become carbon neutral by mid-century.

Under the order, the White House is set to spend billions of dollars to expand a federal fleet of electric vehicles, upgrade buildings owned or leased by the government and add more clean electricity to the grid.

The government will spend its annual buying power of $650 billion to upgrade efficiency at its 300,000 buildings and replace its fleet of 600,000 cars and trucks with electric vehicles.