Photo Courtesy of Southern Co. Four coal units at Alabama Power's Plant Gaston will soon burn gas. Related Links: The U.S. Energy Policy Finally Emerges Utility Seeks Union Assistance As Kemper's Troubles Mount Cost Pressures, Delay Worries Sour Two Southern Co. Projects For decades, Southern Co. has been one of the nation's largest electric utilities and one of the leading consumers of coal. Southern believes coal-fired capacity should remain part of its generation mix. Its Mississippi Power subsidiary—one of four utilities Southern owns—is building what may be one of the last coal-based units in the U.S.: a 582-MW integrated gasification
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.