H.R. 2454, the American Clean Energy and Security Act of 2009, was introduced May 15, 2009, by Representatives Waxman and Markey, and was subsequently modified (both technical and substantive changes) and ordered reported by the House Committee on Energy and Commerce on May 21, 2009. The bill was reported (amended) June 5 (H.Rept. 111-137, Part I).