The power sector is a major source of U.S. air emissions, particularly greenhouse gas emissions. Accordingly, the U.S. Environmental Protection Agency’s (EPA) Clean Power Plan (CPP) requires a 32 percent reduction of carbon emissions below 2005 levels by 2030 from today’s power fleet. With the spotlight on the CPP and the EPA’s final decision on new National Ambient Air Quality Standards (NAAQS) pending, resourceful states are planning a “no regrets” strategy for meeting these and other environmental requirements, such as the Mercury and Air Toxics Standards and Coal Combustion Residuals Rule. In a presentation to the Environmental Council of the States, David Littell highlighted the only pollution control strategy that addresses all of these environmental regulations in the energy sector simultaneously: energy efficiency. Coupled with RAP’s integrated, multi-pollutant planning for energy and air quality (IMPEAQ) concept—an innovative combination of integrated resource planning from the energy world and state implementation plans from the environmental world—states can maximize their compliance plans by leveraging options that have complementary benefits for multiple rules.