A machine for generating usable energy from a wind source is provided. The
machine includes a casing structure that may define an air inlet oriented
with respect to a prevailing wind direction and an air outlet. The casing
structure may be substantially cylindrical. A rotor having a blade
structure is positioned within the casing structure and has a
substantially vertical axis of rotation. The casing structure may include
two side passages for creating a zone of low pressure downstream of the
rotor near the air outlet.
