A Darrieus wind turbine comprising twin cross-flow turbines (10, 20) connected to a generator, the generator comprising a shaft designed to be driven in rotation under the effect of a rotation of the turbines, the wind turbine comprising: - a first turbine movable in rotation about a first rotation axis ( Δ 1), the first turbine comprising several blades (11, 12, 13) distributed about the first rotation axis, - a second turbine movable in rotation about a second rotation axis ( Δ 2), the second turbine comprising several blades (21, 22, 23) distributed about the second rotation axis, - the first rotation axis and the second rotation axis being symmetrical to each other with respect to a vertical axis, the wind turbine being such that: - each turbine (10, 20) extends about a rotation axis between a lower end (10 i, 20 i) and an upper end (10 s, 20 s), the lower end being closer to the generator than the upper end, - the lower end and the upper end of each turbine are aligned with the rotation axis of said turbine, - each turbine blade comprises: • a lower portion (11 i, 12 i), extending from the lower end (10 i), • an upper portion (11 s, 12 s), extending from the upper end (10 s), - each blade extending from the lower end towards the upper end so that: • the radius (r) of the blade corresponding to the distance between the blade and the rotation axis along the lower portion (11 i, 12 i) gradually increases as the distance from the lower end (10 i) increases, • the radius of the blade gradually decreases along the upper portion (11 s) as the distance from the upper end (10 s) decreases, the wind turbine being characterized in that: - the first rotation axis and the second rotation axis are inclined with respect to the vertical axis at the same angle of inclination ( α) of between 25° and 50°, - so that each rotation axis converges on a single generator, so that the horizontal shaft of the generator is driven in rotation by the first turbine and by the second turbine, - the wind turbine defines a median plane (P m), the median plane: • being perpendicular to a downstream plane (P a), the downstream plane containing the first rotation axis ( Δ 1) and the second rotation axis ( Δ 2), • passing through a point of intersection of the first rotation axis and the second rotation axis, - The median plane forms a plane of symmetry of the wind turbine. - a first turbine movable in rotation about a first rotation axis ( Δ 1), the first turbine comprising several blades (11, 12, 13) distributed about the first rotation axis, - a second turbine movable in rotation about a second rotation axis ( Δ 2), the second turbine comprising several blades (21, 22, 23) distributed about the second rotation axis, - the first rotation axis and the second rotation axis being symmetrical to each other with respect to a vertical axis, - each turbine (10, 20) extends about a rotation axis between a lower end (10 i, 20 i) and an upper end (10 s, 20 s), the lower end being closer to the generator than the upper end, - the lower end and the upper end of each turbine are aligned with the rotation axis of said turbine, - each turbine blade comprises: • a lower portion (11 i, 12 i), extending from the lower end (10 i), • an upper portion (11 s, 12 s), extending from the upper end (10 s), • a lower portion (11 i, 12 i), extending from the lower end (10 i), • an upper portion (11 s, 12 s), extending from the upper end (10 s), - each blade extending from the lower end towards the upper end so that: • the radius (r) of the blade corresponding to the distance between the blade and the rotation axis along the lower portion (11 i, 12 i) gradually increases as the distance from the lower end (10 i) increases, • the radius of the blade gradually decreases along the upper portion (11 s) as the distance from the upper end (10 s) decreases, • the radius (r) of the blade corresponding to the distance between the blade and the rotation axis along the lower portion (11 i, 12 i) gradually increases as the distance from the lower end (10 i) increases, • the radius of the blade gradually decreases along the upper portion (11 s) as the distance from the upper end (10 s) decreases, - the first rotation axis and the second rotation axis are inclined with respect to the vertical axis at the same angle of inclination ( α) of between 25° and 50°, - so that each rotation axis converges on a single generator, so that the horizontal shaft of the generator is driven in rotation by the first turbine and by the second turbine, - the wind turbine defines a median plane (P m), the median plane: • being perpendicular to a downstream plane (P a), the downstream plane containing the first rotation axis ( Δ 1) and the second rotation axis ( Δ 2), • passing through a point of intersection of the first rotation axis and the second rotation axis, • being perpendicular to a downstream plane (P a), the downstream plane containing the first rotation axis ( Δ 1) and the second rotation axis ( Δ 2), • passing through a point of intersection of the first rotation axis and the second rotation axis, - The median plane forms a plane of symmetry of the wind turbine.