RRu = [Applicable Supplyu - (Paymentu/ACPRateu)] x Requirement
where:
RRu is the RES' obligation to procure renewable energy resources by generating electricity using renewable energy resources, purchasing electricity generated using renewable energy resources, or purchasing renewable energy credits from renewable energy resources (in megawatt-hours) in utility service area u;
Applicable Supplyu is, for compliance years ending on or before May 31, 2017, the amount of metered electricity supplied to the RES' Illinois retail customers in utility service area u during the compliance year (in megawatt-hours) and is, for compliance years ending on May 31, 2018 and May 31, 2019, the uncovered amount of energy supplied to the RES' Illinois retail customers in utility service area u during the compliance year (in megawatt-hours).
Paymentu is the amount of the alternative compliance payment (in $) made by the RES in utility service area u, including, for compliance years ending on or before May 31, 2017, mandatory ACP payments made in compliance with subsection (e);
ACPRateu is the actual alternative compliance payment rate (in $/MWh) in utility service area u;
Requirement is the annual renewable requirement percentages specified or referenced in subsection (c) (expressed in decimal form).
Ill. Admin. Code tit. 83, § 455.110