TITLE 83: PUBLIC UTILITIES
CHAPTER I: ILLINOIS COMMERCE COMMISSION
SUBCHAPTER b: PROVISIONS APPLICABLE TO MORE THAN ONE KIND OF UTILITY
PART 287 RATE CASE TEST YEAR
SECTION 287.20 TEST YEAR OPTIONS
CHAPTER I: ILLINOIS COMMERCE COMMISSION
SUBCHAPTER b: PROVISIONS APPLICABLE TO MORE THAN ONE KIND OF UTILITY
PART 287 RATE CASE TEST YEAR
SECTION 287.20 TEST YEAR OPTIONS
Section 287.20 Test Year Options
A utility, at its option, may propose either one of the following periods as its proposed test year:
a) Historical. Any consecutive 12 month period, beginning no more than 24 months prior to the date of the utility's filing, for which actual data are available at the time of filing new tariffs; or
b) Future. Any consecutive 12 month period of forecasted data beginning no earlier than the date new tariffs are filed and ending no later than 24 months after the date new tariffs are filed.