This bill amends Section 301 of the Clean Air Act to impose significant new limitations on the Administrator's regulatory authority. Its primary purpose is to restrict the Environmental Protection Agency's ability to issue regulations that could impact consumer vehicle choices, electric grid stability, and the feasibility of required technologies. Specifically, the bill prohibits regulations that would restrict the sale or use of internal combustion engine vehicles or necessitate fuel-switching at power plants . It also prevents regulations that could reduce electric grid reliability or require the use of technologies that are commercially unavailable , cost-prohibitive , or otherwise technically or practically infeasible . These limitations aim to prevent the Administrator from expanding authority beyond Congressional intent and ensure practical and economic considerations are met.