NiSource(NI) - 2023 Q4 - Annual Results

Exhibit 99.1 FOR IMMEDIATE RELEASE: February 21, 2024 NiSource announces fourth quarter 2023 results This press release includes financial results and guidance for NiSource with respect to net operating earnings available to common shareholders and diluted earnings per share (NOEPS), which is a non-GAAP financial measure as defined by the SEC. The company includes this measure because management believes they permit investors to view the company's performance using the same tools that management uses and to ...