Combination to generate electrical energy from the flow movement of a fluid, especially water, with a rotation unit, that has: a main rotation device, which is tightly coupled with a central rotation axis of the rotation unit, several rotation surfaces (3.1, 4.1, 5.1, 6.1, 3.2, 4.2, 5.2, 6.2, 3.3, 4.3, 5.3, 6.3), which are powered by the fluid and which are rotatably attached at a distance from the central rotation axis to the main rotation device in such a manner that the main rotation device is able to rotate around the central rotation axis due to the rotation surfaces, at least one rotation surfaces group (8.1, 8.2, 8.3) with several rotation surfaces, which are positioned along a common rotation surfaces axis (9.1, 9.2, 9.3) and which are connected thereto, and several chambers (3.4, 4.4, 5.4, 6.4), which are provided along and vertically to the central rotation axis and which are radially open with respect to the central rotation axis, wherein a rotation surface (3.3) of a rotation surfaces group (8.3) is positioned in exactly one chamber (3.4); characterised by a casing, wherein the rotation unit is located in the casing and the casing has: an inlet opening for the inflow of fluid or water and an outlet opening for the outflow of the fluid or water from the casing, wherein the inlet opening is opposite to the outlet opening, a casing wall, which extends between the inlet opening and the outlet opening, in order to delimit an inner casing space inside the casing between the inlet opening and the outlet opening, wherein the inner casing space is divided into several compartments (25, 26, 27, 28), separated from one another by casing dividers (29, 30, 31), which extend parallel to one another, and which allow fluid to pass from the inlet opening to the outlet opening, and wherein the casing wall and congruent access openings in the casing dividers (29, 30, 31) between the compartments (25, 26, 27, 28) provide a receiving chamber to receive the rotation unit in the inner casing space. a main rotation device, which is tightly coupled with a central rotation axis of the rotation unit, several rotation surfaces (3.1, 4.1, 5.1, 6.1, 3.2, 4.2, 5.2, 6.2, 3.3, 4.3, 5.3, 6.3), which are powered by the fluid and which are rotatably attached at a distance from the central rotation axis to the main rotation device in such a manner that the main rotation device is able to rotate around the central rotation axis due to the rotation surfaces, at least one rotation surfaces group (8.1, 8.2, 8.3) with several rotation surfaces, which are positioned along a common rotation surfaces axis (9.1, 9.2, 9.3) and which are connected thereto, and several chambers (3.4, 4.4, 5.4, 6.4), which are provided along and vertically to the central rotation axis and which are radially open with respect to the central rotation axis, wherein a rotation surface (3.3) of a rotation surfaces group (8.3) is positioned in exactly one chamber (3.4); characterised by a casing, wherein the rotation unit is located in the casing and the casing has: an inlet opening for the inflow of fluid or water and an outlet opening for the outflow of the fluid or water from the casing, wherein the inlet opening is opposite to the outlet opening, a casing wall, which extends between the inlet opening and the outlet opening, in order to delimit an inner casing space inside the casing between the inlet opening and the outlet opening, wherein the inner casing space is divided into several compartments (25, 26, 27, 28), separated from one another by casing dividers (29, 30, 31), which extend parallel to one another, and which allow fluid to pass from the inlet opening to the outlet opening, and wherein the casing wall and congruent access openings in the casing dividers (29, 30, 31) between the compartments (25, 26, 27, 28) provide a receiving chamber to receive the rotation unit in the inner casing space. an inlet opening for the inflow of fluid or water and an outlet opening for the outflow of the fluid or water from the casing, wherein the inlet opening is opposite to the outlet opening, a casing wall, which extends between the inlet opening and the outlet opening, in order to delimit an inner casing space inside the casing between the inlet opening and the outlet opening, wherein the inner casing space is divided into several compartments (25, 26, 27, 28), separated from one another by casing dividers (29, 30, 31), which extend parallel to one another, and which allow fluid to pass from the inlet opening to the outlet opening, and wherein the casing wall and congruent access openings in the casing dividers (29, 30, 31) between the compartments (25, 26, 27, 28) provide a receiving chamber to receive the rotation unit in the inner casing space.