(2) For the purpose of carrying out the provisions of subsection (1) of this section, the director, based on recommendations of the Residential and Manufactured Structures Board, shall adopt by rule standards for determining whether the installation of a single electrical meter for all dwelling units in a multifamily residential building facilitates an overall reduction in electrical consumption by such units. [Formerly 456.763; 1993 c.744 §94; 2003 c.675 §27; 2009 c.567 §18]