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The World's Biggest Wind Turbine Blades Are So Long Their Tips Spin at 180 MPH. For off-shore wind farms to become an economically feasible alternative energy source, each turbine needs to be big. Like, really big. That's why the latest turbine blade from Siemens is giganticâjust a hair shorter than the wingspan of an Airbus 380.
The European Wind Energy Association (EWEA) reports that the average onshore wind turbine is between 2.5-3 MW, with the ability to power 1,500 average E.U. households, whereas offshore, the average wind turbine is 3.6 MW, enough to power more than 3,300 E.U. households.