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The AES Corporation, together with its subsidiaries, operates as a diversified power generation and utility company in the United States and internationally. The company owns and/or operates power plants to generate and sell power to customers, such as utilities, industrial users, and other intermediaries; owns and/or operates utilities to generate or purchase, distribute, transmit, and sell electricity to end-user customers in the residential, commercial, industrial, and governmental sectors; and generates and sells electricity on the wholesale market. It uses various fuels and technologies to generate electricity, such as coal, gas, hydro, wind, solar, and biomass, as well as renewables comprising energy storage and landfill gas. The company owns and/or operates a generation portfolio of approximately 34,596 megawatts and distributes power to 2.6 million customers. The company was formerly known as Applied Energy Services, Inc. and changed its name to The AES Corporation in April 2000. The AES Corporation was incorporated in 1981 and is headquartered in Arlington, Virginia.

Atlantic Power Corporation owns and operates a fleet of power generation assets in the United States and Canada. As of December 31, 2020, its portfolio consisted of twenty-one operating projects with an aggregate electric generating capacity of approximately 1,723 megawatts on a gross ownership basis and approximately 1,327 MW on a net ownership basis across eleven states in the United States and two provinces in Canada. The company sells its electricity to utilities and other customers. The company was incorporated in 2004 and is headquartered in Dedham, Massachusetts. As of May 14, 2021, Atlantic Power Corporation was taken private.

Covanta Holding Corp. engages in the operation and ownership of infrastructure for the conversion of waste to energy, related waste transport and disposal, and other renewable energy production businesses. It operates large-scale energy-from-waste and renewable energy projects. The company was founded on April 16, 1992 and is headquartered in Morristown, NJ.

MGE Energy, Inc., through its subsidiaries, operates as a public utility holding company primarily in the United States. It operates through Regulated Electric Utility Operations; Regulated Gas Utility Operations; Nonregulated Energy Operations; Transmission Investments; and All Other segments. The company generates, purchases, and distributes electricity and natural gas in Wisconsin and Iowa; owns and leases electric generating capacity; and plans, constructs, operates, maintains, and expands transmission facilities to provide transmission power services. It generates electricity from coal-fired, gas-fired, and renewable energy sources. As of December 31, 2023, the company owned and operated 835 miles of overhead electric distribution lines; 1,330 miles of underground electric distribution cables; 49 substations with an installed capacity of 1.2 million kVA; and gas facilities, including 3,066 miles of distribution mains, as well as supplied electric service to approximately 163,000 customers. MGE Energy, Inc. founded in 2001 and is headquartered in Madison, Wisconsin.