The U.S. offshore wind market, which has lagged behind Europe for 20 years, has made significant strides in the past month as the controversial Cape Wind project near Cape Cod, Mass., received the first-ever approval from the U.S. Dept. of Interior to build such a wind farm. The project inked a power sales agreement with National Grid for half the output of the 468-MW wind farm. + Image Illustration: Walter Konefal Related Links: Britain’s Huge Offshore Wind Farm Faces An Array of Challenges Boston-based Cape Wind is years ahead of most other projects; its contract with London-based National Grid Plc
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.