1. By January 1, 2009, the department shall establish, by rule, a minimum energy efficiency standard for new and substantially renovated state buildings over five thousand square feet which shall be at least as stringent as the International Energy Conservation Code 2006, or the latest version thereof.

2. All new or substantially renovated state buildings over five thousand square feet for which design of such construction or renovation is initiated on or after July 1, 2009, shall meet applicable provisions of the minimum energy efficiency standard.