| http://www.w3.org/ns/prov#value | - That???s because North America generates electricity at 60 hertz, while much of the world, including China and Turkey, operates on the 50-hertz system; the different frequencies require machines that spin at different speeds. ???From a business standpoint, it makes more sense to bring it into the 50 hertz market first,??? says Donohue. ???We absolutely see a need for flexible generation in the U.S
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