One night in early March as well as the next day before dawn, the Dept. of Energy’s Jeffrey M. Baker wasn’t pleased when he noticed lights still burning on two floors of his pet project: the National Renewable Energy Laboratory’s new, ultra-green office building in Golden, Colo. “The cleaning staff probably left them on,” said Baker, who oversees the lab. Photo: Dennis Schroeder/NREL Monitors Pless (left) and a colleague track the building’s energy use to see if it aligns with the energy model used for design. Related Links: 2011 Award of Excellence Winner: Jeffrey M. Baker Risky ‘Golden’ Job Proves
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.