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Customer Service: 1-800-4NIPSCO

Gas Emergencies: 1-800-634-3524

TDD/TTY

Relay: 1-800-635-0952

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Mail us

For payments

NIPSCO

P.O. Box 13007

Merrillville, IN 46411

For customer service

NIPSCO

801 E. 86th Avenue

Merrillville, IN 46410

For legal notices

Corporation Service Company

135 North Pennsylvania Street, Suite 1610

Indianapolis, IN 46204


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Email BusinessLink@NiSource.com with your company name, customer name, address, phone number, account number and meter number.

Have an emergency?

Natural Gas: If you smell gas, think you have a gas leak, have carbon monoxide symptoms or have some other gas emergency situation, go outside and call 911 and then our emergency number 1-800-634-3524.
Electric: For any electric emergency, including a downed power line, power outage or other electric-related situation, please call 1-800-464-7726.