October - 19 - 1941
United States  
The first wind turbine to generate energy for an alternating current central power system was placed in service in Grandpa's Knob, Vt. It was phased into the Central Vermont Public Service Corporation's system. Synchronized operation continued for two hours, during which a maximum output of 800 kilowatts was delivered. The wind velocity at that time was 26 miles an hour. Palmer Cosslet Putnam was the inventor. With two blades and a tip-to-tip diameter of 53.3 m (175 feet) it continues to deliver electricity to the grid for four years until it loses a blade in 1945 and is shut down.

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