National Association of Energy Officials, June 2014.
http://111d.naseo.org/

"The State 111(d) Resource Hub will provide information for State Energy Offices on the U.S. Environmental Protection Agency's (EPA) rulemaking for regulating greenhouse gas emissions from existing power plants under Section 111(d) of the Clean Air Act.  The EPA rulemaking will set guidelines for states to reduce their carbon dioxide emissions from existing power plants. The rule, known as the Clean Power Plan, was released by EPA on June 2, 2014. It allows states to meet state-specific goals through a mix of strategies, including energy efficiency, renewable energy, and demand-side management."