SUNation Energy Updates Investor Presentation

On September 15, 2025, SUNation Energy, Inc. updated its investor presentation, which includes Non-GAAP financial measures. The company believes these measures provide a more complete understanding of its business and are useful for assessing shareholder value. The presentation contains forward-looking statements based on current expectations and beliefs, subject to risks and uncertainties. The company disclaims any obligation to update these statements but reserves the right to do so. The filing also includes the updated investor presentation as Exhibit 99.1.