A solar roof forming element (1, 100), a plurality of which may at least partially form a roof (3, 103) which closes an opening of a building, each of said plurality of roof forming elements closing a part of said opening, said roof forming element comprising - an elongate polymer roof plate, defining a length and width (w) of the roof forming element, the roof plate having an exterior side facing the exterior of the building, and having an interior side, opposite the exterior side, facing an inner space of the building, in use, - an elongate cover for at least substantially completely covering the exterior side of the roof plate at a distance therefrom, connected to the roof plate, so as to define an interior space of the roof forming element between the cover and the roof plate, the cover being transparent to light, - a photovoltaic element, provided in the interior space, and - coupling means for coupling the roof forming element in use to a further, neighbouring roof forming element (1', 100') of said plurality of roof forming elements extending in parallel to the roof forming element, the roof forming element comprising a plurality of elongate, wire shaped metal reinforcement elements incorporated within the roof plate and/or within the cover, distributed over the width of the roof forming element and extending along the length of the roof forming element, wherein the plurality of elongate metal reinforcement elements have been distributed over the width of the roof forming element (1, 100) such that at least five, preferably at least 10, metal elements are provided per metre width of the roof plate, and wherein, in plan view, the plurality of elongate metal reinforcement elements covers at most 10 % of the area of the roof plate. said roof forming element comprising - an elongate polymer roof plate, defining a length and width (w) of the roof forming element, the roof plate having an exterior side facing the exterior of the building, and having an interior side, opposite the exterior side, facing an inner space of the building, in use, - an elongate cover for at least substantially completely covering the exterior side of the roof plate at a distance therefrom, connected to the roof plate, so as to define an interior space of the roof forming element between the cover and the roof plate, the cover being transparent to light, - a photovoltaic element, provided in the interior space, and - coupling means for coupling the roof forming element in use to a further, neighbouring roof forming element (1', 100') of said plurality of roof forming elements extending in parallel to the roof forming element, the roof forming element comprising a plurality of elongate, wire shaped metal reinforcement elements incorporated within the roof plate and/or within the cover, distributed over the width of the roof forming element and extending along the length of the roof forming element, - an elongate polymer roof plate, defining a length and width (w) of the roof forming element, the roof plate having an exterior side facing the exterior of the building, and having an interior side, opposite the exterior side, facing an inner space of the building, in use, - an elongate cover for at least substantially completely covering the exterior side of the roof plate at a distance therefrom, connected to the roof plate, so as to define an interior space of the roof forming element between the cover and the roof plate, the cover being transparent to light, - a photovoltaic element, provided in the interior space, and - coupling means for coupling the roof forming element in use to a further, neighbouring roof forming element (1', 100') of said plurality of roof forming elements extending in parallel to the roof forming element, the roof forming element comprising a plurality of elongate, wire shaped metal reinforcement elements incorporated within the roof plate and/or within the cover, distributed over the width of the roof forming element and extending along the length of the roof forming element, wherein the plurality of elongate metal reinforcement elements have been distributed over the width of the roof forming element (1, 100) such that at least five, preferably at least 10, metal elements are provided per metre width of the roof plate, and wherein, in plan view, the plurality of elongate metal reinforcement elements covers at most 10 % of the area of the roof plate.