Bechtel Corp. moved into the renewable-energy sector in a big way on Sept. 14, announcing it would develop and own an offshore wind farm on Lake Erie with partners Cavallo Energy LLC and Great Lakes Wind Energy. The five-turbine, $100-million project, seven miles from Cleveland, could become the first offshore wind farm in the United States. “There is no question that renewables is a growth area … we are moving into,” says Sprague Cook, vice president and manager of renewable power for Bechtel. The San Francisco-based multinational engineering-construction firm is looking into both onshore and offshore wind development, he says.
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.