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P.O. Box 13007
Merrillville, IN 46411
For customer service
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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NIPSTEEL is an organization of representatives from NIPSCO and all business customers of NIPSCO served at 138,000 volts or greater. If you're a member, login here.
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