EXHIBIT 99.1 News MGE Energy Reports Second-Quarter 2025 Earnings Madison, Wis., August 06, 2025—MGE Energy, Inc. (Nasdaq: MGEE), today reported financial results for the second quarter of 2025. MGE Energy's GAAP (Generally Accepted Accounting Principles) earnings for the second quarter of 2025 were $26.5 million, or$0.73 per share, compared to $23.8 million, or$0.66 per share, for the same period in the prior year. Rate base investment growth and weather impacts drove our second- quarter results. In the ...