The Biden administration proposed strict new auto emissions rules on Wednesday aimed at accelerating the U.S. electric vehicle transition with the goal of having EVs account for up to 67% of all new vehicles sold by 2032.

The proposed standards, which President Joe Biden ordered the Environmental Protection Agency to craft in an August 2021 executive order under the Clean Air Act, will apply to passenger vehicles beginning in model year 2027 and extending through model year 2032.

While the EPA’s proposed rule would not mandate or require automakers to sell a certain number of EVs, it would restrict the total level of emissions generated by each company’s total fleet of sold cars, which is essentially another way of restricting internal combustion engine-powered vehicle sales.

The transportation sector generates the largest share of greenhouse gas emissions in the United States, according to the EPA, accounting for 27% of total greenhouse gas emissions as of 2020.