‘ 7-A. Voluntary renewable energy market set-aside. The department shall set aside a portion of the State's annual carbon dioxide emissions budget in a voluntary renewable market set-aside account. The allowances from this account must be retired in an amount equal to the amount of carbon dioxide emissions reduced by the voluntary purchase of eligible renewable energy credits by persons in the State up to the amount held in the set-aside account. For purposes of this subsection, "eligible renewable energy credits" means renewable energy credits generated within the states that are participating in the regional greenhouse gas initiative.’