In the middle of a cornfield in only one afternoon, Clay Warren’s company can install streetlights that are independent of any electrical grid, leaving behind nothing but tire tracks bathed in the glow of light-emitting diode (LED) lamps. Photo Courtesy Of Interactive Energies Lighting fixtures can be installed quickly with a minimal footprint. Photo Courtesy Of Interactive Energies Without sun or wind power, each unit’s battery can hold a five-day charge. Interactive Energies is doing just that at the southwest entrance of the Castleton Square mall in Indianapolis, according to IE co-founder Warren. The Simon Property Group hired the firm,
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.