Separate portfolio standards are required for energy resources classified as “Class I,” “Class II,” or “Class III.” Class I resources include electricity derived from solar power, wind power, fuel cells, geothermal,  landfill methane gas, anaerobic digestion or other biogas derived from biological sources, thermal electric direct energy conversion, ocean thermal power, wave or tidal power, low-emission advanced renewable energy conversion technologies, run-of-the-river hydropower facilities not exceeding 30 megawatts (MW) in capacity, and biomass facilities that use sustainable biomass fuel and meet certain emissions requirements.   In 2018, Substitute Senate Bill 9 defined low emission advanced renewable energy conversion technologies as including, but not limited to, zero emission low grade heat power generation systems based on organic oil free rankine, kalina or other similar nonsteam cycles that use waste heat from an industrial or commercial process that does not generate electricity. Substitute Senate Bill 9 also made run-of-the-river hydropower facilities that received a new license after January 1, 2018 an eligible Class I energy source.

Class II resources include trash-to-energy facilities that have obtained required permits.

Class III resources include: (1) customer-sided CHP systems, with a minimum operating efficiency of 50%, installed at commercial or industrial facilities in Connecticut on or after January 1, 2006; (2) electricity savings from conservation and load management programs that started on or after January 1, 2006, and (3) systems that recover waste heat or pressure from commercial and industrial processes installed on or after April 1, 2007.

Tracking Registry: NEPOOL-GIS