Black Hills Corporation

NorthWestern Corporation, which conducts business under the name NorthWestern Energy, supplies electricity and natural gas to residential, commercial, and diverse industrial clients. The company organizes its operations into two primary divisions: Electric and Natural Gas. In its Electric segment, NorthWestern Energy is responsible for generating, procuring, transmitting, and distributing electrical power. For its Natural Gas segment, the firm undertakes the production, purchase, storage, transmission, and delivery of natural gas, additionally holding local government authorizations to provide gas services in various communities. The company's extensive infrastructure in Montana encompasses 6,819 miles of electric transmission lines, 18,177 miles of electric distribution lines, and roughly 400 transmission and distribution substations. Its natural gas network in Montana features 2,166 miles of transmission lines, 4,945 miles of distribution lines, and approximately 138 city gate stations. Furthermore, in South Dakota, NorthWestern Energy manages 1,308 miles of electric transmission and 2,320 miles of electric distribution lines. Its natural gas facilities in South Dakota include 55 miles of transmission lines, while a combined 2,517 miles of natural gas distribution lines serve both South Dakota and Nebraska. Collectively, NorthWestern Energy caters to approximately 753,600 customers situated across Montana, South Dakota, Nebraska, and Yellowstone National Park. The corporation was founded in 1923 and is based in Sioux Falls, South Dakota.

Evergy, Inc., along with its subsidiaries, operates as an integrated electric utility, focusing on the production, conveyance, distribution, and direct sale of power throughout Kansas and Missouri in the United States. The company's electricity generation relies on a diverse energy mix, utilizing sources such as coal, hydroelectric, landfill gas, uranium, natural gas, and oil, alongside a growing portfolio of renewables like solar and wind energy. Supporting its operations, Evergy maintains a robust infrastructure, which includes roughly 10,100 circuit miles of high-voltage transmission lines, about 39,800 circuit miles of overhead distribution lines, and an additional 13,000 circuit miles of underground distribution networks. It provides service to a substantial customer base of approximately 1,620,400, encompassing residential consumers, commercial enterprises, industrial facilities, municipal entities, and fellow electric utilities. Evergy, Inc. was founded in 2017 and has its main corporate headquarters situated in Kansas City, Missouri.

OGE Energy CorpOGE · EnergyOklahoma City, United States

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OGE Energy Corp., along with its various subsidiaries, operates as a comprehensive energy and utility provider. The company facilitates the physical delivery and associated services for electricity, natural gas, crude oil, and natural gas liquids across the United States. Its core operations encompass the generation, transmission, distribution, and sale of electrical power. OGE Energy serves approximately 879,000 retail electric customers within an expansive service area spanning about 30,000 square miles in Oklahoma and western Arkansas. The company also owns and manages a diverse portfolio of power generation facilities, utilizing coal, natural gas, wind, and solar sources. As of December 31, 2021, OGE Energy Corp. maintained substantial interconnected electrical infrastructure. This included 16 power generation stations with a combined output capability of 7,207 megawatts. Its transmission networks featured 54 substations and 5,122 structural miles of lines in Oklahoma, complemented by 7 substations and 277 structural miles of lines in Arkansas. The distribution systems were equally extensive: in Oklahoma, they comprised 350 substations, 29,494 structural miles of overhead lines, 3,365 miles of underground conduit, and 11,125 miles of underground conductors. In Arkansas, this infrastructure included 29 substations, 2,795 structural miles of overhead lines, 349 miles of underground conduit, and 662 miles of underground conductors. Established in 1902, OGE Energy Corp. is headquartered in Oklahoma City, Oklahoma.

ONE Gas, Inc., along with its affiliated companies, functions as a regulated natural gas utility across the United States. Its operations are structured into three distinct divisions: Oklahoma Natural Gas, Kansas Gas Service, and Texas Gas Service. These divisions collectively deliver natural gas distribution services to approximately 2.2 million customers spanning three states. Its diverse clientele includes residential households, commercial enterprises, and transportation sector users. Pertaining to its infrastructure, as of December 31, 2021, the company maintained an extensive network comprising roughly 41,600 miles of distribution mains and 2,400 miles of transmission pipelines. Furthermore, it possessed a substantial natural gas storage capacity of 51.4 billion cubic feet. Established in 1906, ONE Gas, Inc. maintains its corporate headquarters in Tulsa, Oklahoma.

Alliant Energy Corporation operates as a utility holding entity, delivering regulated electricity and natural gas provisions. The company's activities are structured across three primary segments: Utility Electric Operations, Utility Gas Operations, and Utility Other. Through its subsidiary, Interstate Power and Light Company (IPL), it is responsible for generating and distributing electricity, and distributing and transporting natural gas to individual consumers across Iowa. IPL also supplies electricity to wholesale buyers in Minnesota, Illinois, and Iowa, in addition to producing and supplying steam within Cedar Rapids, Iowa. By the close of 2021, IPL served around 500,000 retail electricity clients and roughly 225,000 retail natural gas customers. Similarly, its other subsidiary, Wisconsin Power and Light Company (WPL), handles the generation and distribution of electricity, as well as the distribution and transport of natural gas for retail consumers throughout Wisconsin, alongside selling electricity to wholesale accounts within the state. At the same date (December 31, 2021), WPL provided electric service to approximately 485,000 retail clients and natural gas to about 200,000. Its diverse retail clientele spans sectors such as farming, agriculture, industrial manufacturing, chemicals, packaging, and food production. Furthermore, the corporation holds and manages a short-line rail freight operation in Iowa, a multi-modal freight terminal (barge, rail, and truck) situated on the Mississippi River, and a rail-accessible warehouse, also in Iowa. It also provides freight brokerage solutions. The company also possesses stakes in a 347-megawatt (MW) natural gas-powered electricity generation facility near Sheboygan Falls, Wisconsin, and a 225 MW wind energy farm in Oklahoma. Established in 1981, its corporate headquarters are situated in Madison, Wisconsin.

Avista Corporation operates as an energy utility, conducting business through its various subsidiaries. Its operations are divided into two primary segments: Avista Utilities and AEL&P. The Avista Utilities division is responsible for electric distribution and transmission, as well as natural gas distribution services, across parts of eastern Washington and northern Idaho. It also delivers natural gas services to areas of northeastern and southwestern Oregon. Additionally, this segment generates electricity in Washington, Idaho, Oregon, and Montana, and engages in the wholesale buying and selling of electricity and natural gas. The AEL&P segment, conversely, supplies electrical services to approximately 17,400 customers located in the city and borough of Juneau, Alaska. The company generates its electricity from hydroelectric, thermal, and wind power sources. As of February 23, 2022, Avista was serving 406,000 electric customers and 372,000 natural gas customers. Beyond its core utility business, the company also makes investments in venture funds, real estate, and other diverse ventures. Avista Corporation was established in 1889 and is headquartered in Spokane, Washington.