Cirro Energy is a retail energy provider supplying electricity across portions of the United States.

Cirro Energy was founded in 2001 to sell electricity in deregulated markets throughout the state of Texas. In 2008 Cirro Energy was acquired by Dominion Retail. The company then expanded its energy service into Illinois, Pennsylvania, and New York. Six years later, NRG Energy acquired Dominion Retail, and their service expanded into three more states, Connecticut, New Jersey, and Ohio. In the majority of their territory, they operated as Independent Energy Group d/b/a Cirro Energy. In Texas, however, NRG Energy continued operating as Cirro Energy and currently has tens of thousands of customers in the Texas market alone.