shares of nrg energy inc nrg shed 269 to 3406 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 158 to 407163 and dow jones industrial average djia falling 102 to 3353083 nrg energy inc closed 1376 short of its 52week high 4782 which the company achieved on may 26th