Related Links: Pew Charitable Trusts study Proposals Sought for Largest Ever Army Renewables Program A new study says the Dept. of Defense is well on its way to meeting its goal of an electric grid that uses more renewable and energy-efficient components.The report, which the Washington, D.C.-based Pew Charitable Trusts released on Jan. 15, found that DOD energy-efficiency projects more than doubled, to 1,339 in FY 2012 from 630 in FY 2010. Renewable-energy projects jumped 54%, to 700, in that same period.By the end of 2018, renewable-energy capacity on U.S. military bases could rise more than fivefold, to 2.1 GW,
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.