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NorthWestern Energy Group, Inc. provides electricity and natural gas to residential, commercial, and various industrial customers. It generates, purchases, transmits, and distributes electricity; and produces, purchases, stores, transmits, and distributes natural gas, as well as owns municipal franchises to provide natural gas service in the communities. The company operates 6,600 miles of electric transmission and 18,674 miles of electric distribution lines with approximately 395 transmission and distribution substations; and 2,235 miles of natural gas transmission and 5,155 miles of natural gas distribution lines with approximately 133 city gate stations in Montana. It also operates 1,310 miles of electric transmission and 2,365 miles of electric distribution lines in South Dakota with approximately 124 transmission and distribution substations; and 55 miles of natural gas transmission and 2,573 miles of natural gas distribution lines in South Dakota and Nebraska. The company provides electricity and/or natural gas to approximately 775,300 customers in Montana, South Dakota, Nebraska, and Yellowstone National Park. NorthWestern Energy Group, Inc. was founded in 1923 and is based in Sioux Falls, South Dakota.

ONE Gas, Inc., together with its subsidiaries, operates as a regulated natural gas distribution company in the United States. The company provides natural gas distribution services to approximately 2.3 million customers in Oklahoma, Kansas, and Texas. It serves residential, commercial, and transportation customers. The company was founded in 1906 and is headquartered in Tulsa, Oklahoma.

PNM Resources, Inc., through its subsidiaries, provides electricity and electric services in the United States. It operates through Public Service Company of New Mexico (PNM) and Texas-New Mexico Power Company (TNMP) segments. The PNM segment engages in the generation, transmission, and distribution of electricity. The segment owns and leases communications, office and other equipment, office space, vehicles, and real estate. It generates electricity using coal, natural gas and oil, and nuclear fuel and waste, as well as solar, wind, geothermal, and battery storage energy sources. The TNMP segment provides regulated transmission and distribution services. The segment also owns and leases vehicles, service facilities, and office locations throughout its service territory. The company serves residential, commercial, and industrial customers and end-users of electricity in New Mexico and Texas. PNM Resources, Inc. was founded in 1882 and is based in Albuquerque, New Mexico.

Spire Inc., together with its subsidiaries, engages in the purchase, retail distribution, and sale of natural gas to residential, commercial, industrial, and other end-users of natural gas in the United States. The company operates through three segments: Gas Utility, Gas Marketing, and Midstream. It is also involved in the marketing of natural gas and related services; and transportation and storage of natural gas. In addition, the company engages in the operation of propane through its propane pipeline, risk management, and other activities. The company was formerly known as The Laclede Group, Inc. and changed its name to Spire Inc. in April 2016. Spire Inc. was founded in 1857 and is based in Saint Louis, Missouri.