A modular wind turbine comprising: - a housing (30, 42, 43) comprising a flat base, an open housing inlet end and an open and opposite housing exit end wherein the said housing is shaped to allow a plurality of the said housings to be used in a stacked modular fashion; - a freely rotatable drum style rotor (25, 20, 38, 41) horizontally mounted within the said housing (30, 42, 43) and the said drum style rotor is open at both ends with a rotor inlet end for funneling air into the rotor and a rotor exit end opposite the said rotor inlet end to direct air away from the drum style rotor, and wherein the said rotor inlet end and said rotor exit end are aligned with the said housing inlet end and said housing exit end respectively; - one or more blades disposed within and connected to the said drum style rotor and co-axial therewith whereby the passage of air through the said drum style rotor induces the said drum style rotor to rotate about its axis; - an inlet cowling within the said housing and located at the said housing inlet end to concentrate air as a nozzle and direct the said concentrated air into the said drum style rotor; - a plurality of generators which are interruptibly connected with the said drum style rotor and located on the periphery of the said drum style rotor within the said housing (30, 42, 43) in order to generate electricity; - a flywheel co-axial with the said drum style rotor and located within the said housing (30, 42, 43) which can be interruptibly connected through two-way clutching means with either the said drum style rotor or one or more of the said plurality of generators or other motive force in order to store or use rotational energy; - a motor driven turntable on which the said flat base of the said housing (30, 42, 43) rests or is attached and which allows the wind turbine to be directed into the wind; - a controller which measures speed and direction of the wind and controls the said motor driven turntable, and the said interruptible connections between the said drum style rotor and the said plurality of generators or other motive force, and the said interruptible connection between the said drum style rotor and the said flywheel in order to maximize the electrical output of the said wind turbine under different operating conditions. - a housing (30, 42, 43) comprising a flat base, an open housing inlet end and an open and opposite housing exit end wherein the said housing is shaped to allow a plurality of the said housings to be used in a stacked modular fashion; - a freely rotatable drum style rotor (25, 20, 38, 41) horizontally mounted within the said housing (30, 42, 43) and the said drum style rotor is open at both ends with a rotor inlet end for funneling air into the rotor and a rotor exit end opposite the said rotor inlet end to direct air away from the drum style rotor, and wherein the said rotor inlet end and said rotor exit end are aligned with the said housing inlet end and said housing exit end respectively; - one or more blades disposed within and connected to the said drum style rotor and co-axial therewith whereby the passage of air through the said drum style rotor induces the said drum style rotor to rotate about its axis; - an inlet cowling within the said housing and located at the said housing inlet end to concentrate air as a nozzle and direct the said concentrated air into the said drum style rotor; - a plurality of generators which are interruptibly connected with the said drum style rotor and located on the periphery of the said drum style rotor within the said housing (30, 42, 43) in order to generate electricity; - a flywheel co-axial with the said drum style rotor and located within the said housing (30, 42, 43) which can be interruptibly connected through two-way clutching means with either the said drum style rotor or one or more of the said plurality of generators or other motive force in order to store or use rotational energy; - a motor driven turntable on which the said flat base of the said housing (30, 42, 43) rests or is attached and which allows the wind turbine to be directed into the wind; - a controller which measures speed and direction of the wind and controls the said motor driven turntable, and the said interruptible connections between the said drum style rotor and the said plurality of generators or other motive force, and the said interruptible connection between the said drum style rotor and the said flywheel in order to maximize the electrical output of the said wind turbine under different operating conditions.