The apparatus for use of flow energy has elongated circumferential elements (18) with incident-flow surfaces (34, 35) facing the flow, which elements (8) are connected parallel to one another at intervals to form a rotating cage (1) or to form a strip, which is circumferential on a guide and in which they form crossbars, and the rotation axis or deflection axes is or are arranged transversely to the flow direction, with the elements (8) each having two incident-flow surfaces (34, 35). The two incident-flow surfaces (34, 35) may have the capability to swivel into the direction facing the wind by rotation of the elements (8) when the rotor (1) or strip is running. Outside the rotating cage (1), the apparatus may be provided with essentially radially aligned guide walls (22), and the rotor (1) and the walls (22) may be provided with a roof (24) in the form of a flat truncated cone.