A Darrieus type windmill is incorporated with spheroidal shape elevated water tank located inside the blade. The blades thus form a shape of spheroidal configuration with connection flanges at the top and bottom of the elevated tank portion. The stem post of the elevated water tank, a cylindrical shell, will also serve as turbine generator supports. The windmill will perform various functions including water pump, electrical generator, air compressor, vacuum pump and refrigeration compressor by means of different gear boxes. Except the water storage tank of spheroidal shape, all of equipments are located inside the bottom cone of the water tank support to provide efficient maintenance and inspection procedures. By adapting the VAWT system, the wind power efficiency is improved and reduced maintenance costs are highly expected.