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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.
Wind turbines operate on a simple principle. The energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which spins a generator to create electricity. Click on the image to see an animation of wind at work.