Nipsco Customer Service Contact Details
Nipsco Customer Service Customer Service 1-800-4NIPSCO, (1-800-464-7726) Gas Emergencies 1-800-634-3524 Electric Outages or Emergencies 1-800-464-7726 Relay 1-800-635-0952 Nipsco Mailing Address For paymentsNIPSCOP.O. Box 13007Merrillville, IN 46411 For customer serviceNIPSCO801 E. 86th AvenueMerrillville, IN 46410 For legal noticesCorporation Service Company135 North Pennsylvania Street, Suite 1610Indianapolis, IN 46204 Services Scope Useful Links Website Facebook Twitter