Illinois Administrative Code (Last Updated: March 27, 2024)

§287.20. Test Year Options

Latest version.

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.

                    
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