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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.

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.

Environmental Power Corporation engages in the development, ownership, and operation of renewable energy production facilities in the United States. The company develops renewable energy facilities for the production and commercial application of methane-rich biogas produced from animal, food industry, and other organic wastes. The biogas could be sold to end-users or used to produce pipeline-grade methane, which is referred as renewable natural gas, liquefied natural gas, compressed natural gas, and renewable electrical energy or thermal energy, as well as to produce other useful by-products. Environmental Power Corporation operates three single digester facilities in Wisconsin. The company was founded in 1982 and is headquartered in Tarrytown, New York.

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.