NRG Energy (NRG) shares soared 6.4% in the last trading session to close at $87.09. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 0% loss over the past four weeks. NRG Energy continues to expand its operations through organic and inorganic initiatives. Its diverse customer base and ability to retain customers enhance its financial performance. The company continues to optimize its generation portfolio by retiring uneconomic fos ...