; (4) the carbon capture and clean hydrogen technologies proposed as the best system of emission reduction have not been commercially utilized, are not cost-effective, and are not feasible, and are therefore not adequately demonstrated; and (5) the proposed rule described in paragraph (2) is an illegal interpretation of section 111 of the Clean Air Act ( 42 U.S.C. 7411 ) and has not been authorized by that section or any other provision of Federal law. 3. Proposed new source performance standards and emissions guidelines for greenhouse gas emissions from certain stationary sources The Administrator of the Environmental Protection Agency may not finalize, implement, or enforce the proposed rule of the Environmental Protection Agency entitled New Source Performance Standards for Greenhouse Gas Emissions From New, Modified, and Reconstructed Fossil Fuel-Fired Electric Generating Units; Emission Guidelines for Greenhouse Gas Emissions From Existing Fossil Fuel-Fired Electric Generating Units; and Repeal of the Affordable Clean Energy Rule (88 Fed. Reg. 33240 (May 23, 2023)) or a substantially similar rule.