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An Illinois natural-gas distribution company serving more than two million customers across northern Illinois.

Last updated August 22, 2026

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Overview

Nicor Gas is a natural-gas distribution company headquartered in Naperville, Illinois. Founded in 1954, it operates a regulated utility network serving more than two million customers across most of the northern third of Illinois, while excluding the city of Chicago. Its infrastructure includes approximately 34,000 miles of pipelines, making the company one of the major natural-gas distribution systems in the state. The company’s core role is the local delivery of natural gas rather than the production of gas. It maintains distribution infrastructure, connects residential, commercial, and industrial customers, and provides the delivery service through which customers receive natural gas at their premises. Like other regulated gas utilities, its operations are closely tied to public-utility oversight, infrastructure reliability, safety, service continuity, and the management of seasonal demand. Nicor Gas became part of a larger corporate structure during a period of consolidation in the American utility sector. AGL Resources announced its acquisition of Nicor in December 2010, and the transaction closed in 2011. In 2016, Southern Company announced its acquisition of AGL Resources, bringing Nicor Gas into Southern Company’s broader energy portfolio. The company consequently operates as an Illinois gas utility within a larger regional energy group rather than as an independent publicly traded corporation. Nicor Gas’s geographic identity is central to its brand. Its service territory covers much of northern Illinois outside Chicago, including communities in the broader Chicago metropolitan area and surrounding regions. The company’s network scale and customer base make its principal public-facing concerns the dependable delivery of natural gas, emergency response, pipeline maintenance, customer service, billing, and programs associated with energy use and supply choice. The available reference material does not establish a separate consumer-product portfolio beyond these utility services or identify a distinct international operating presence.

History

Nicor Gas was founded in 1954 and developed as a natural-gas distribution business serving Illinois customers. Its business model centered on the local delivery of natural gas through a large pipeline network rather than on gas exploration or production. Over time, the company became an important utility for communities across the northern third of Illinois, excluding the city of Chicago. The company’s service territory and infrastructure formed the foundation of its operating identity. Nicor Gas serves more than two million customers and maintains approximately 34,000 miles of pipelines. This network supports residential, commercial, and industrial users and requires continuous attention to maintenance, safety, reliability, customer connections, billing, emergency response, and the management of demand that varies significantly by season. Nicor Gas later became part of the consolidation of the North American utility industry. In December 2010, AGL Resources announced that it would acquire Nicor. The transaction closed in 2011, making Nicor Gas a subsidiary within AGL Resources’ portfolio. This changed the company’s corporate ownership while preserving its role as a northern Illinois gas distributor. A second major ownership transition followed in 2016, when Southern Company announced its acquisition of AGL Resources. Through that transaction, Nicor Gas became part of Southern Company’s larger energy group. The company therefore moved from its earlier independent corporate setting into a multistate utility organization while continuing to operate under the Nicor Gas name and serve its established Illinois territory. Nicor Gas’s history is consequently defined less by a succession of consumer products than by the expansion and operation of a regulated utility network, the continuity of service to a large customer base, and changes in corporate ownership. The available reference material does not provide additional verified details about individual founders, chief executives, financial performance, major marketing campaigns, or specific infrastructure projects.

  • 2016

    Southern Company announces AGL Resources acquisition

    [1]

    Southern Company announced its acquisition of AGL Resources, ultimately making Nicor Gas part of Southern Company.

  • 2011

    Acquisition closes

    [1]

    AGL Resources completed its acquisition of Nicor, bringing Nicor Gas into the AGL Resources group.

  • 2010

    AGL Resources announces acquisition

    [1]

    AGL Resources announced its planned acquisition of Nicor.

  • 1954

    Company founded

    [1]

    Nicor Gas was established as an Illinois natural-gas distribution company.

Products and positioning

A large, locally focused regulated natural-gas utility for northern Illinois, positioned around reliable delivery, infrastructure scale, safety, and customer service.

  • Utility service · 1954

    Natural-gas distribution

    Nicor Gas’s principal offering is the regulated delivery of natural gas through its Illinois distribution network. The service connects customers to the utility’s pipeline system and supports household, commercial, and industrial energy use. Operations include network maintenance, service connections, emergency response, metering-related customer functions, and billing. The company’s distribution system extends for approximately 34,000 miles and serves more than two million customers in northern Illinois outside Chicago.

Brand decisions

  • 2016

    Southern Company acquisition of AGL ResourcesM&A

    Background

    AGL Resources owned Nicor Gas following the 2011 acquisition.

    Action taken

    Southern Company announced its acquisition of AGL Resources.

    Aftermath

    Nicor Gas became part of Southern Company’s energy portfolio.

  • 2010

    AGL Resources acquisition announcementM&A

    Background

    Nicor operated as a major Illinois natural-gas distributor and became the subject of a proposed acquisition by AGL Resources.

    Action taken

    AGL Resources announced its plan to acquire Nicor.

    Aftermath

    The transaction closed in 2011, integrating Nicor Gas into AGL Resources.

Recent events

  • Reported

    Celadyne Technologies receives inaugural Nicor Gas Multicultural Innovator Award[3]

    Nicor Gas and Clean Energy Trust named Celadyne Technologies the inaugural recipient of the Nicor Gas Multicultural Innovator Award, which includes a $25,000 equity and inclusion grant.

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