The Environmental Protection Agency (EPA) proposed the Affordable Clean Energy (ACE) rule on August 21. The proposed rule would replace the Obama administration’s Clean Power Plan, establishing alternative guidelines for states to develop plans to reduce carbon dioxide emissions from existing fossil fuel-fired electric power plants. The ACE rule departs from the Clean Power Plan, among other ways, by removing incentives for natural gas and renewable energy use, limiting averaging and trading in state plans, giving states more flexibility in creating plans, slowing down state plan development and submission schedules, and proposing a new industry friendly test for the New Source Review permitting process. Overall, EPA has projected that the ACE rule will result in similar carbon dioxide emissions reductions in comparison to the Clean Power Plan.