A perfectly efficient blade would capture all the energy in the wind passing through it, which, sadly isn't possible in the real world. Physics, in the form of Betz's Law, dictates a theoretical maximum efficiency of around 59.
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Dramatic Cost Range: Wind turbine costs span from $700 for small residential units to over $20 million for offshore turbines, with total project costs varying from $10,000 to $4,000+ per kW installed depending on scale and location.
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For compact, grid-connected setups, expect $3,000–$8,000 per installed kilowatt in many markets, with higher-end projects exceeding that when weatherproofing, control systems, and long-distance interconnections are required. Assumptions: region, specs, labor hours.
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The tips of a modern wind turbine's blades can reach speeds of over 200 mph (322 km/h), although the actual rotational speed, measured in RPM (revolutions per minute), varies significantly depending on the turbine's design, size, and wind conditions.
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