Now that the U.S. Environmental Protection Agency (EPA) has released its final Clean Power Plan (CPP), states must plan in earnest for compliance. Energy efficiency can be a powerful tool for meeting some or all of the required greenhouse gas emission reductions at low cost, while also providing numerous other benefits. In a presentation to the National Association of State Energy Officials (NASEO), Ken Colburn encourages regulators to leverage the value of efficiency in compliance plans, engage with air regulators, neighboring states, and regional EPA offices as early as possible, and to elevate solutions that address multiple pollutants and water concerns. Energy efficiency can help pave the way to a least-cost, approvable compliance plan.