NRG Energy (NRG) closed the latest trading day at $81.83, indicating a -0.15% change from the previous session's end. The stock trailed the S&P 500, which registered a daily gain of 1.7%. At the same time, the Dow added 1.26%, and the tech-heavy Nasdaq gained 2.51%.The the stock of power company has fallen by 0.97% in the past month, lagging the Utilities sector's gain of 4.97% and the S&P 500's gain of 1.27%.The investment community will be paying close attention to the earnings performance of NRG Energy i ...