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About Us

For six decades, Nicor Gas has been serving Illinois customers with clean, safe, reliable and affordable natural gas. As the state’s largest natural gas distributor, and owner and operator of one of the largest natural gas aquifer storage systems in North America, we deliver the comfort and convenience of natural gas to 2.2 million residential, public sector and business customers in more than 650 communities throughout northern Illinois.

With 2,000 employees constructing, operating, maintaining and inspecting our nearly 34,000-mile distribution system, the safety of our employees, the public and our pipelines is our highest priority. This commitment is demonstrated in our rigorous operating standards, safety training and monitoring, and our effort to continuously meet and exceed all state and federal regulations.

As an important contributor to the Illinois economy, we are dedicated to investing in programs and initiatives that enrich the community, enhance diversity, invigorate the economy, promote education and support environmental stewardship. We leverage our assets and resources to improve the quality of life for the communities where we live, work and serve.


1855  Nicor Gas is a direct descendant of Ottawa Gas Light and Coke Company, the company that lit up the historic Lincoln-Douglas debate in Ottawa on Aug. 21, 1858. 
1920s More than 70 gas companies eventually merge into three, including the Illinois Northern Utilities Company.
1950 - 1953   Illinois Northern Utilities Company becomes part of Public Service, and Public Service merges into Commonwealth Edison.
1954 Com Ed cuts ties with its gas properties. Northern Illinois Gas is formed from several companies in and around Ottawa.
Mid 1950s In 1955 Union Gas and Electric is acquired. Several years later, the groundwork is laid for the world's largest underground gas storage system.
1960s We expand our service area and begin drilling for natural gas. We also increase our natural gas storage capacity by developing underground storage.
1997 Northern Illinois Gas begins operating its natural gas business as Nicor Gas.
2011 Nicor Gas becomes a subsidiary of AGL Resources Inc., an Atlanta-based energy holding company.
July 2016 AGL Resources becomes Southern Company Gas, a wholly-owned subsidiary of Southern Company.
Today As part of the Southern Company Gas family, we continue to deliver safe and reliable natural gas.

Keeping Gas Prices Down
Nicor Gas customers are connected to a 34,000-mile distribution system that is part of a network of eight interstate pipelines. We purchase gas during the summer months when it is normally less expensive and store it for use throughout the year. This helps keep winter costs down and our year-round supply up. Our gas purchasing strategies, coupled with our underground storage facilities, ensure that Nicor Gas customers receive reliable, competitively-priced service.

Regional Offices
Our corporate office is in Naperville, Illinois, with regional offices located throughout our service territory