NRG Energy, Inc. (NRG), headquartered in Princeton, New Jersey, is a wholesale power generation company founded in 1989, which has an ownership interest in 47 power generating facilities around the world. The diverse portfolio of facilities, are primarily in the Northeast, South Central and Western regions of the United States but, they have locations in Europe, Australia and Latin America. The company's operations include baseload, intermediate, peaking, and cogeneration facilities, thermal energy production and energy resource recovery facilities. NRG also has ownership interests in generating facilities in Australia and Germany.

David Crane, who holds an undergraduate degree from Princeton University and a Harvard Law School graduate, is the CEO.

In late 2005, NRG Energy bought Texas-based Texas Genco from a group of private equity firms for a price of roughly $5.9 billion.