HOUSTON, March 11 Tue Mar 11, 2014 6:50pm EDT

(Reuters) - NRG Energy Inc's said its retail electric U.S. customer base will grow by 30 percent with Tuesday's agreement to acquire the retail power business of Dominion Resources Inc for an undisclosed amount.

Princeton, New Jersey-based NRG has about 2 million residential and commercial customers and will add more than 600,000 customer accounts served by Dominion and its Cirro Energy unit, a spokeswoman said.

Dominion's retail customers are in Connecticut, Illinois, Maryland, Massachusetts, New Jersey, New York, Ohio and Pennsylvania.

Cirro Energy, which was purchased in 2008 by Dominion Retail, serves residential and business customers in Texas.

About 80 percent of Dominion's customer base is in the Northeast with the remainder in Texas, according to a spokeswoman.

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http://www.reuters.com/article/2014/03/11/utilities-nrg-power-idUSL2N0M82A320140311