Maryland Adopts 2012 IECC December 5, 2011 | IMT Share Maryland has become the first U.S. state to adopt the 2012 International Energy Conservation Code. Read our press release to learn more. Tag(s): Build-outs and New Construction Retrofits States Program Area(s): Codes Meet the Author IMT Want to get regular updates from IMT? PhoneThis field is for validation purposes and should be left unchanged.