An integrated building photovoltaic apparatus, suitable for closing an opening on a facade of a building and generating electricity from a solar radiation which pass through said opening, comprising: - a first and a second pane both at least partially transparent, which are joined to each other by means of an interposed spacer so as to form an internal chamber between them, - a blind arranged inside said internal chamber and comprising a plurality of movable slats which comprise at least one photovoltaic slat and which can be moved to vary the amount of the solar radiation passing through the opening; - connection elements (12a, 12b), configured to pull or push said slats so as to make them translate along a first axis that is parallel to said panes (10A, 10B) and/or to rotate around second axes which are also parallel to said panes (10A, 10B) and perpendicular to said first axis; wherein said at least one photovoltaic slat comprises a photovoltaic sheet comprising: a substrate, at least one insulating layer arranged on said substrate, a back contact layer arranged on said at least one insulating layer, a plurality of junction layers (44, 45) arranged on said back contact layer and at least a front contact layer arranged on said plurality of junction layers (44, 45), the photovoltaic sheet comprising interconnection grooves (51, 52, 53) which define in the photovoltaic sheet a plurality of thin film solar cells (40, 40') monolithically connected each other in series, characterized in that said plurality of thin film solar cells (40, 40') comprises at least two coupling thin film solar cells, each one of which comprises: - a through hole passing through the substrate, the at least one insulating layer, the back contact layer, the plurality of junction layers (44, 45) and the at least one front contact layer and - a close-pattern isolation groove surrounding the through hole and extending at least through said front contact layer, said plurality of junction layers (44, 45) and said back contact layer so as to define an inactive area of said coupling thin film solar cell surrounding the through hole; said connection elements (12a, 12b) comprising first connection elements passing through said through holes. - a first and a second pane both at least partially transparent, which are joined to each other by means of an interposed spacer so as to form an internal chamber between them, - a blind arranged inside said internal chamber and comprising a plurality of movable slats which comprise at least one photovoltaic slat and which can be moved to vary the amount of the solar radiation passing through the opening; - connection elements (12a, 12b), configured to pull or push said slats so as to make them translate along a first axis that is parallel to said panes (10A, 10B) and/or to rotate around second axes which are also parallel to said panes (10A, 10B) and perpendicular to said first axis; wherein said at least one photovoltaic slat comprises a photovoltaic sheet comprising: a substrate, at least one insulating layer arranged on said substrate, a back contact layer arranged on said at least one insulating layer, a plurality of junction layers (44, 45) arranged on said back contact layer and at least a front contact layer arranged on said plurality of junction layers (44, 45), the photovoltaic sheet comprising interconnection grooves (51, 52, 53) which define in the photovoltaic sheet a plurality of thin film solar cells (40, 40') monolithically connected each other in series, characterized in that said plurality of thin film solar cells (40, 40') comprises at least two coupling thin film solar cells, each one of which comprises: - a through hole passing through the substrate, the at least one insulating layer, the back contact layer, the plurality of junction layers (44, 45) and the at least one front contact layer and - a close-pattern isolation groove surrounding the through hole and extending at least through said front contact layer, said plurality of junction layers (44, 45) and said back contact layer so as to define an inactive area of said coupling thin film solar cell surrounding the through hole; - a through hole passing through the substrate, the at least one insulating layer, the back contact layer, the plurality of junction layers (44, 45) and the at least one front contact layer and - a close-pattern isolation groove surrounding the through hole and extending at least through said front contact layer, said plurality of junction layers (44, 45) and said back contact layer so as to define an inactive area of said coupling thin film solar cell surrounding the through hole; said connection elements (12a, 12b) comprising first connection elements passing through said through holes.