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Rated power 4.5 MW Rotor 140 m Wind class IEC 3a Cut-in wind speed 3 m/s Rated wind speed 12 m/s Cut-out wind speed 20 m/s Sound power 110.2 db(A) Hub height tubular tower 100 m to 130 m, 140 m lattice-tubular or concrete-tubular hybrid tower power capacities of 500 kW, 3 MW, and 15 MW. As indicated, all three systems have overall efficiencies near 80%. 3. and power . to heat ratios of 0.1 or lower. High overall efficiencies and low . power to heat ratios are common characteristics for steam turbines . configured for CHP applications. Figure 1. Components of a boiler/steam turbine. §The rated, or nominal, wind speed is the speed at which the turbine produces power at its full capacity. For example the GE 1.5s does not generate 1.5 MW of power until the wind is blowing steadily at 27 mph or more. As the wind falls below that, power production falls exponentially.