Ind. Code § 6-2.5-5-10
Transactions involving tangible personal property are exempt from the state gross retail tax, if:
(2) the person acquiring the property is:
(B) a power subsidiary (as defined in IC 6-2.5-1-22.5 ) that furnishes or sells electrical energy, steam, or steam heat to a public utility described in clause (A).
As added by Acts 1980, P.L.52, SEC.1. Amended by P.L.23-1988, SEC.8; P.L.71-1993, SEC.6; P.L.137-2022, SEC.25.