A large majority of commercial building energy codes in the United States are based on either the ASHRAE/IES 90.1 energy standard or the International Energy Conservation Code (IECC) model code. Both feature increasingly stringent requirements for lighting controls.
The creators of the ASHRAE/IES 90.1 energy standard set an aggressive goal for the 2010 version, published in November 2010: 30 percent energy savings over the 2004 version. According to a detailed analysis conducted by the Department of Energy, they hit it.
A new national energy standard took effect on Dec. 30, 2010. On that day, all states had to certify to the U.S. Department of Energy (DOE) that they had a commercial building energy code in place at least as stringent as ASHRAE/IES 90.1 2004 or justify why they could not comply.