Abstract: Arrangements for converting kinetic energy of ocean currents into electric energy, comprising a floating body carrying a plurality of so called Savonius turbines (26), each of which having at least two blades (34) with a substantially semi-circular cross-section for transferring a rotary motion of the turbine to an electric power generating unit (40). The floating body comprises elongated, mutually spaced and interconnected pontoons (12) and defining between the pontoons a narrowed through-passage (18) for water currents. At least one pair of Savonius turbines being suspended vertically across the through-passage (18) so as to extend downwardly from an upper deck (14) into the through-passage. Alternatively, the Savonius turbines are rotatably mounted at opposite ends in the pontoons so as to extend horizontally above each other across the through-passage. The adjacent turbines are configured to rotate in opposite directions.