U.S. Department of Energy ordered 3 power plants to stay operational beyond retirements. MISO studies and capacity auctions justify emergency orders. NIPSCO's Schahfer unit produces 850 MW (1980s), CenterPoint's Culley unit produces 100 MW. Total capacity of 3.1 GW from three units. Orders may cost $615,000 daily per unit. Indiana utilities are shifting away from coal. CenterPoint plans to convert Culley to natural gas by 2027. Advocacy groups warn of pollution and coal ash concerns