Abstract: Floating water current power station comprising a ring-shaped pontoon (3) which by means of a mooring bitt (5) is anchored to anchors (1). All turbines (21) are detachably arranged on a common beam (11) and can as a unit be swung up to the surface within the area limited by the ring pontoon (3). The power station may swing around the bitt (5) the upper end of which is connected to a front pontoon (9) and a lower end (6) of which is secured to the anchors and which is moreover provided with tension distributing warps (16) to the turbine beam (11) and warps (7) to the same pontoon side as the one to which the bitt is secured.