83 Ill. Adm. Code 711.105
Cost Apportionment
Section 711
Section 711.105 Cost
Apportionment
The cost allocation manual shall include a cost apportionment table for
each account containing costs incurred in providing regulated services. The
apportionment table shall include the cost pools by account, the procedures
used to place costs into each cost pool, and the method used to apportion the
costs within each cost pool between regulated and nonregulated activities.