ABSTRACT
Traditional horizontal wind turbines continue to evolve and become more efficient through a combination of improved rotor aerodynamic designs, introduction of active feedback aerodynamic control, and the use of better materials. This chapter discusses the possible concepts listing their potential benefits, as well as possible limitations. Vertical axis wind turbines (VAWTs) are receiving a second look as an alternative to horizontal axis wind turbines. An alternative to a wind farm of smaller VAWTs is the concept for a Gigawatt rated vertical wind turbine. The magnetic levitation would eliminate the friction on the bearing support at the base of the wind turbine. The concept of focusing the wind for energy harvesting has also entered into building architecture. Both horizontal and vertical aerodynamic wind turbines rely on converting aerodynamic lift on rotating wing sections into electrical work. The following are complete departures from these concepts that are categorized as "bladeless wind turbines". Another bladeless concept is referred to as the "Wind Stalk".
