AUTHORITY: Implementing Section 13-507 and authorized by Section 10-101 of the Public Utilities Act [220 ILCS 5/13-507 and 10-101].ILLINOIS COMMERCE COMMISSION
a) The costs are brought into existence as a direct result of providing the service or group of services; or
b) The costs are avoided if the service or group of services is not provided.
Costs shall be attributed to individual services or groups of services based on the following cost causation principle. Costs are recognized as being caused by a service or group of services if: