This bill significantly amends the Clean Air Act to impose new limitations on the Environmental Protection Agency's (EPA) regulatory authority. It specifically prohibits the Administrator from issuing regulations that would restrict the sale or use of any type of vehicle or engine, including new motor vehicles with internal combustion engines , thereby aiming to preserve consumer vehicle choice. Furthermore, the legislation prevents the EPA from enacting regulations that could require fuel-switching at power plants or reduce the reliability of the electric grid . It also bars regulations that mandate the use of technologies that are commercially unavailable, cost-prohibitive, or otherwise technically, economically, or practically infeasible, independent of subsidies. The bill's intent is to prevent the EPA from significantly expanding its authority beyond the original intent of Congress, ensuring that environmental regulations do not impose undue burdens or dictate specific technologies without considering their practical implications.