Contact Information

The Gas Transportation Customer Service Center is available to assist you with billing inquiries, contract processing, nominations, credit activities and authorized use request. If you would like to email your questions you may email them to gtqa@nicor.com 

The telephone number is 630 983-4040.

• Option 1 for a customer service representative
• Option 2 for the nominations desk
• Option 3 for Critical Day and OFO information

The fax number 630 983-6070.
 
For Gas Exchange problems please call 630 388-2589.

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