NOVELTY - Underwater wing (9) of an energy plant having a non-planar profile for capturing energy from water movements into reciprocating motion of the wing, is claimed.    USE - The underwater wing is useful in: energy plant for capturing energy from water movements into reciprocating motion of the wing (claimed); and tide and river stream generators.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a converter for converting mechanical energy of reciprocating motion into electrical energy in an energy plant utilizing energy of water movement, where the converter is a hinge-type energy converter (12) comprising a cover and a shaft within the cover, the shaft and cover can rotate in relation to each other, and the converter further comprises a mechanical or hydraulic transmission for increasing the relative speed of rotation, and an electric generator driven by the rotation;    (2) a connector for transmission of electrical energy in underwater environment, comprising means for transferring electrical energy using magnetic induction between two halves of the connector, where the connector has a ferromagnetic core, which is split into two parts, one in each of the connector halves, which are at least partially closed in watertight housings; and    (3) an energy plant utilizing water movements caused by water waves or currents for providing electrical energy, comprising at least one energy production unit which comprises an underwater actuator for capturing mechanical energy from water movements into reciprocating motion of the actuator, and an energy converter for converting the mechanical energy into electrical energy when the underwater actuator applies a rotational force to the converter, where the production unit comprises at least one of the underwater wing as the actuator, a hinge-type energy converter and an induction connector (46).    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the energy plant.    Underwater wing (9)    Hinge-type energy converter (12)    Induction connector (46)