The appointment of a new CFO typically has a neutral short-term impact on a company's stock price. However, Bruce Chung's appointment may bring fresh perspectives to NRG Energy's financial strategy, which could have a positive or negative impact on the company's performance in the long run. The relevance of this news is high as it directly pertains to NRG Energy, and the importance is moderate as CFO changes can influence a company's financial direction. The confidence in this analysis is relatively high, as it is based on the information provided in the article.