The Natural Resource Defense Council released a report December 4 finding that individual, statewide CO2 emissions limits for existing power plants could decrease sector emissions 26 percent in 2020 and reduce wholesale generating costs. The report, Closing the Power Plant Carbon Pollution Loophole: Smart Ways the Clean Air Act Can Clean Up America’s Biggest Climate Polluters, concluded that the program would cost power companies $4 billion annually but would encourage $90 billion in energy efficiency investments.