Indiana Code Title 8. Utilities and Transportation § 8-1-31-13

(1) for a public utility, produce total adjustment revenues exceeding ten percent (10%) of the eligible utility's base revenue level approved by the commission in the eligible utility's most recent general rate proceeding;  or

(2) for a municipally owned or not-for-profit utility, produce total adjustment revenues over the course of each twelve (12) month recovery period that exceed ten percent (10%) of the eligible utility's base revenue level approved by the commission in the eligible utility's most recent general rate proceeding.

(1) infrastructure improvement costs associated with eligible infrastructure improvements that are placed in service due to the construction, reconstruction, or improvement of a highway, street, or road (as defined in IC 8-23-1-23), including projects under IC 8-25;  or

(2) property taxes associated with eligible infrastructure improvements.