"Reconciliation period" means a period beginning with the January monthly billing period and extending through the December monthly billing period.
"Rate case reconciliation revenue requirement" means the final distribution revenue requirement or requirements approved by the Commission in the utility's rate case or formula rate proceeding to set the rates initially applicable in the relevant reconciliation period after the conclusion of the period. In the event the Commission has approved more than one revenue requirement for the reconciliation period, the amount of rate case revenue under each approved revenue requirement shall be prorated based upon the number of days under which each revenue requirement was in effect.
If the utility no longer has a performance-based formula in effect under Section 16-108.5, then the utility shall be permitted to implement the revenue balancing adjustment tariff described in subsection (c) of this Section.
220 ILCS 5/9-107