The percent of assessment for personal property tax purposes of machinery or equipment used to generate electricity, steam for sale, or hot or chilled water for sale that is used to heat or cool a building, as described in Section 7-237 of the Tax-Property Article, Maryland Code, is inicreased from 50% for the taxable year 2007 to:
(a) 65% for the taxable year beginning July 1, 2008;
(b) 60% for the taxable year beginning July 1, 2009; and
(c) 55% for the taxable year beginning July 1, 2010. (2008 L.M.C., ch. 4, § 1; 2016 L.M.C., ch. 7, § 2.)