shares of nrg energy inc nrg sank 070 to 3279 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 030 to 397015 and dow jones industrial average djia falling 071 to 3265670 this was the stocks second consecutive day of losses nrg energy inc closed 1503 below its 52week high 4782 which the company reached on may 26th despite its losses the stock outperformed some of its competitors tuesday as duke energy corp duk fell 162