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Settling lawsuits filed by certain States (located in the Northeast and West), environmental groups, New York City and the District of Columbia, on December 23, 2010, U.S. EPA announced that it will set New Source Performance Standards ("NSPS") for greenhouse gas ("GHG") emissions from fossil fuel-fired electric power plants and petroleum refineries. NSPS are required under Section 111 of the Clean Air Act ("CAA"). EPA agrees that it will issue proposed standards by July 26, 2011, for power plants, and by December 10, 2011, for refineries. EPA also agrees that it will issue the standards as final rules for power plants and refineries by December 10, 2011, and November 10, 2012, respectively. EPA's settlement agreements are subject to a 30-day public comment period before they are final.