Wyodak Power Plants, Wyoming

The Wyodak complex, located in the Powder River Basin, has three separate plants that produce electricity from coal. One of them, the Wyodak plant, is one of the largest air-cooled power plants in the nation (generating around 350 megawatts). Also on site are the Neil Simpson and Wygen power plants, which together generate another 500 megawatts. The plants use coal from the Wyodak mine, located on the other side of the interstate. Wyodak was the first major coal mine of the Powder River Basin, opening in the 1920s, making it likely the oldest operating surface coal mine in the US.