AGL Resources Inc., an energy services holding company, distributes natural gas to residential, commercial, and industrial customers in Illinois, Georgia, Virginia, New Jersey, Florida, Tennessee, and Maryland. It operates through four segments, Distribution Operations, Retail Operations, Wholesale Services, and Midstream Operations segments. The Distribution Operations segment constructs, manages, and maintains intrastate natural gas pipelines and distribution facilities. As of December 31, 2015, this segment owned approximately 81,300 miles of underground distribution and transmission mains. The Retail Operations segment markets natural gas, and various energy-related products that provide natural gas price stability and utility bill management, as well as offers home protection products and services, and home warranty and energy efficiency plans. The Wholesale Services segment is involved in the natural gas storage, and gas pipeline arbitrage and related activities; provision of asset management and optimization, storage, transportation, production, and peaking services; and wholesale marketing of natural gas in the United States and Canada. The Midstream Operations segment engages in the natural gas storage business that develops, acquires, and operates underground natural gas storage assets in the Gulf Coast region of the United States and in northern California. The company serves approximately 4.5 million customers, as well as 645,000 energy customers in 7 states; and 1.2 million services contracts in 17 states. AGL Resources Inc. was founded in 1856 and is headquartered in Atlanta, Georgia.