shares of nrg energy inc nrg advanced 316 to 3422 tuesday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 146 to 407660 and the dow jones industrial average djia rising 109 to 3408604 nrg energy inc closed 1360 short of its 52week high 4782 which the company achieved on may 26th the stock outperformed some of its competitors tuesday as duke energy corp duk rose 080 to 10245 exelon corp exc rose 105 to 4219 and sempra