NRG Energy, Inc., together with its subsidiaries, operates as an energy company in the United States. The company is involved in the producing, selling, and delivering electricity and related products and services to 3.1 million residential, industrial, and commercial consumers. It generates electricity using natural gas, coal, oil, solar, nuclear, wind, fossil fuel, and nuclear sources. The company also provides system power, distributed generation, solar and wind products, backup generation, storage and distributed solar, demand response, energy efficiency, advisory, and on-site energy solutions; and carbon management and specialty services.

In addition, it trades in electric power, natural gas, and related commodity and financial products, including forwards, futures, options, and swaps. Further, the company supplies fuels; provides transportation services; and directly sells energy, services, and products and services to retail customers under the NRG, Reliant, and other names. It develops, constructs, owns, and operates natural gas, coal, oil, solar, nuclear, wind, fossil fuel, and nuclear plants with generation capacity of 23,000 megawatts. The company was founded in 1989 and is headquartered in Princeton, New Jersey.