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wind turbine solar panel renewable energy sustainable energy green energy alternative energy clean energy eco-friendly environmentally friendly sustainable development climate change global warming energy efficiency energy conservation energy storage smart grid microgrid distributed generation on-site generation rooftop solar community solar utility-scale solar solar farm wind farm wind energy wind power wind turbine windmill turbine rotor blade nacelle tower foundation anemometer wind vane wind speed wind direction wind shear air density temperature humidity pressure altitude site assessment wind resource assessment