A micro-wind system for electricity generation suitable for being integrated into a building of which at least one of its external surfaces constitutes the element that intercepts the flow of the wind , being said micro-wind generation system wherein: a. said at least one external surface that constitutes the element that intercepts the flow of the wind has a plurality of holes, or slits, or openings in general, through which the wind that hits it can enter, and b. said holes, or said slits, or openings in general, constitute the entrance to special channeling ducts, internally shaped so that the air is forced to flow only in the incoming direction, so that the wind which invests said at least one external surface enters said ducts, but it is substantially prevented from escaping from the same holes, or slits, or openings in general, which are present in said at least one external surface, and the air is forced to exit from the other end of said ducts; moreover: c. at least one rotating element with wind blades is positioned at the outlet of these ducts, and d. said at least one rotating element is positioned so that the air coming out of said ducts invests said wind blades thus putting in rotation said rotating element, and e. said at least one rotating element is part of an electrical generator which transforms part of the mechanical energy transmitted to said rotating element, being put in rotation, into electrical energy; and said least one external surface which constitutes the element that intercepts the flow of wind is characterized in that it comprises: i. a surface cover on which there is said plurality of holes, or slits, or openings in general, through which the wind can enter, and ii. an underlying surface shaped with grooves suited to convey the air that hits said underlying surface along a prevailing direction and to avoid that the air disperses indifferently in various directions. a. said at least one external surface that constitutes the element that intercepts the flow of the wind has a plurality of holes, or slits, or openings in general, through which the wind that hits it can enter, and b. said holes, or said slits, or openings in general, constitute the entrance to special channeling ducts, internally shaped so that the air is forced to flow only in the incoming direction, so that the wind which invests said at least one external surface enters said ducts, but it is substantially prevented from escaping from the same holes, or slits, or openings in general, which are present in said at least one external surface, and the air is forced to exit from the other end of said ducts; moreover: c. at least one rotating element with wind blades is positioned at the outlet of these ducts, and d. said at least one rotating element is positioned so that the air coming out of said ducts invests said wind blades thus putting in rotation said rotating element, and e. said at least one rotating element is part of an electrical generator which transforms part of the mechanical energy transmitted to said rotating element, being put in rotation, into electrical energy; and said least one external surface which constitutes the element that intercepts the flow of wind is characterized in that it comprises: i. a surface cover on which there is said plurality of holes, or slits, or openings in general, through which the wind can enter, and ii. an underlying surface shaped with grooves suited to convey the air that hits said underlying surface along a prevailing direction and to avoid that the air disperses indifferently in various directions. i. a surface cover on which there is said plurality of holes, or slits, or openings in general, through which the wind can enter, and ii. an underlying surface shaped with grooves suited to convey the air that hits said underlying surface along a prevailing direction and to avoid that the air disperses indifferently in various directions. <EOS>