Consulting engineers and construction contractors alike are looking forward to participating in the single-largest investment ever for modernizing the U.S. electric grid. The $3.4 billion of grant awards announced late last month by President Obama will be matched by utilities in 49 states for a total of $8.2 billion to install “Smart Grid” technologies. The Energy Dept. hopes that investment will put the country on a path to obtain 20% of its electricity from renewable sources by 2020 and shave more than 1,400 MW off peak power demand. On the long-heralded Smart Grid, customers and electricity providers will be linked
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.