The Emissions & Generation Resource Integrated Database (eGRID) is a comprehensive source of data on the environmental characteristics of almost all electric power generated in the United States. eGRID is issued by the U.S. Environmental Protection Agency (EPA). As of February 2011 the available editions of eGRID contain data for years 2007 2005 and 2004 (all in eGRID2010) as well as archived data for years 1996 through 2000.