 MERRILLVILLE, Ind., May 5, 2021 PRNewswire -- NiSource Inc. NYSE: NI today announced, on a GAAP basis, net income available to common shareholders for the three months ended March 31, 2021 of 281.7 million, or 0.72 diluted earnings per share, compared to a net income available to common shareholders of 61.8 million, or 0.16 diluted earnings per share, for the same period of 2020. 