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This report presents a brief summary about wind energy and present day technologies available for horizontal wind turbines. A detailed taxonomy for horizontal axis wind turbines is presented covering parts of the turbine, control systems, applications among others. A detailed landscape analysis of patent and non-patent literature is done with focus on '''Doubly-fed Induction Generator (DFIG)''' used in the horizontal axis wind turbines for efficient power generation. Existing productsproduct' s information of major players in the market is also compiled for Doublydoubly-fed induction generators. Existing market and future market prediction for wind energy based power generation is presented.