SolarReserve's Crescent Dunes Solar Energy Plant, located near Tonopah, Nev., features an array of 10,347 mirrors arranged in a circle 1.75 miles across. A 640-foot-tall tower glows when the sun's energy is concentrated and directed to the top.
The coal plant in Shamokin Dam, Pa., is a local landmark that delivered electricity to this region for more than six decades. It closed in 2014. Next to it, a brand new natural gaspower plant is under construction.