(c) For the purpose of RESA, unused RECs shall remain valid for up to two years from the end of the calendar year in which the associated electricity was generated and shall be permanently retired when used for attainment of the renewable energy goal prescribed by the act. To the extent that RECs or attributes associated with renewable energy generation are sold or used for any purpose other than attainment of the renewable energy goal, the utilities shall reduce the capacity used for attainment of the renewable energy goal according to the formula specified in this subsection. Total Renewable Capacity for Voluntary Attainment = TRC-Cop where
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TRC = total renewable capacity
COP = renewable capacity sold or used for any other purpose than attainment of the renewable energy goal
EOP = energy from RECs or renewable energy attributes sold or used for any other purpose than attainment of the renewable energy goal
CF = capacity factor for source of EOP