EXHIBIT 99.1 News MGE Energy Reports Third-Quarter 2025 Earnings Electric segment earnings were $1.3 million higher in the third quarter of 2025, a result of strategic capital investments that grew rate base. This growth was largely driven by the successful deployment of key renewable energy projects. The Darien Solar Project in Rock and Walworth counties became operational in March 2025, followed by the Paris Battery Energy Storage System (BESS) in June 2025. MGE owns 25 MW of solar capacity from the Darie ...