NRG Energy Inc (NRG) shares tumbled 5.69% in pre-market trading on Wednesday following the release of its second-quarter earnings report. The energy company's results fell short of analyst expectations, and its reaffirmed guidance for fiscal 2025 came in below Wall Street estimates, sparking a sell-off among investors.

NRG reported Q2 non-GAAP earnings of $1.73 per diluted share, up slightly from $1.70 a year earlier but missing the FactSet analyst consensus of $1.74. Revenue for the quarter ended June 30 increased to $6.74 billion from $6.66 billion in the same period last year, surpassing the expected $6.45 billion. Despite the revenue beat, the company's bottom line performance disappointed investors.

Adding to the downward pressure on the stock, NRG reaffirmed its adjusted earnings guidance for fiscal 2025 at $6.75 to $7.75 per share, which falls short of the $7.86 expected by analysts surveyed by FactSet. This lower-than-anticipated outlook suggests potential challenges ahead for the company, further contributing to the negative sentiment in pre-market trading. As NRG Energy aims to navigate through these headwinds, investors will be closely monitoring the company's performance in the coming quarters for signs of improvement.