Despite last year’s economic downturn, global wind power capacity kept growing—particularly in China, which has squeaked past Germany to become the world’s second-largest wind power market behind the U.S. China more than doubled installed capacity in 2009 to 25.8 GW, says the Global Wind Energy Council (GWEC). “The biggest difference in terms of expansion comes from local Chinese manufacturers,” says Dheeraj Choudhary, the global renewable-energy business-unit chief at Cleveland manufacturer Parker Hannifin, which has provided hydraulics and other parts for Chinese-made wind turbines for a decade. GWEC reports about 80 domestic wind-turbine makers. Joanna Lewis, assistant professor at Georgetown University,
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.