Section 11F½ of chapter 25A of the General Laws, as amended by chapter 251 of the Acts of 2014, is hereby amended by striking out subsection (a) and inserting in place thereof the following subsection:-

(a) The department shall establish an alternative energy portfolio standard for all retail electricity suppliers selling electricity to end-use customers in the commonwealth. Every retail electric supplier providing service under contracts executed or extended on or after January 1, 2009 shall provide a minimum percentage of kilowatt-hour sales, as determined by the department, to end-use customers in the commonwealth from alternative energy generating sources and the department shall annually thereafter determine the minimum percentage of kilowatt-hour sales to end-use customers in the commonwealth which shall be derived from alternative energy generating sources. For the purposes of this section, “alternative energy generating source” shall mean a source which generates energy using any of the following: (i) combined heat and power; (ii) flywheel energy storage; (iii) energy efficient steam technology; (iv) any facility that generates useful thermal energy using sunlight, biomass, biogas, liquid biofuel, waste-to-energy which is a component of conventional municipal solid waste plant technology in commercial use, or naturally occurring temperature differences in ground, air or water, whereby 1 megawatt-hour of alternative energy credit shall be earned for every 3,412,000 British thermal units of net useful thermal energy produced and verified through an on-site utility grade meter or other means satisfactory to the department; provided, however, that facilities using biomass fuel shall be low emission, use efficient energy conversion technologies and fuel that is produced by means of sustainable forestry practices; (v) any other alternative energy technology approved by the department under an administrative proceeding conducted under chapter 30A. 

A waste-to-energy facility shall not be an alternative energy generating source under clause (iv) unless it (1) operates or contracts for one or more recycling programs approved by the department of environmental protection and; (2) 50% of any revenue received by the facility through the sale of APS-eligible alternative energy certificates is allocated to such recycling programs.

The following technologies and fuels shall not be considered alternative energy supplies: (A) coal; (B) petroleum coke; (C) oil; (D) natural gas, except when used in combined heat and power or as a biogas generating useful thermal energy; (E) construction and demolition debris including, but not limited to, chemically-treated wood and (F) nuclear power.