Providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "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".

HJRES 177 is a congressional resolution seeking to disapprove an Environmental Protection Agency (EPA) rule that established new greenhouse gas emission standards for new power plants, guidelines for existing power plants, and repealed a previous rule (the Affordable Clean Energy Rule). If passed, this resolution would nullify the EPA rule (published in the Federal Register on May 9, 2024), preventing it from taking effect. The resolution directly affects the EPA's regulatory authority over emissions from fossil fuel-fired power plants. It does not create new policy but seeks to block an existing agency regulation through the congressional disapproval process.