At the request of the Government Accountability Office, The U.S. Department of Energy's Building Energy Codes Program (BECP) undertook an analysis of the energy savings and cost impacts associated with the use of newer and more efficient commercial building energy codes in the states of Louisiana and Mississippi. BECP looked at three levels of energy standards – ASHRAE Standard 90-75, ASHRAE 90.1-2001, and ASHRAE Standard 90.1-2004 – that cover both the full range of standards currently on the books in Louisiana and Mississippi and the logical next standards for these states.