Ind. Code § 8-1-2-115
The commission shall inquire into any neglect or violation of the statutes of this state or the ordinances of any city or town by any public utility doing business therein, or by the officers, agents, or employees of the public utility, or by any person operating the plant of any public utility, and shall have the power, and it shall be its duty, to enforce this chapter, as well as all other laws, relating to public utilities. Any forfeiture or penalty provided in this chapter shall be recovered and suit shall be brought in the name of the state of Indiana in the circuit or superior court where the public utility has its principal place of business. Complaint for the collection of any such forfeiture may be made by the commission or any member of the commission, and, when so made, the action so commenced shall be prosecuted by the general counsel for the commission.
IC 8-1-2-115