Abstract: A generation apparatus for generating power from subsea currents is described. The generation apparatus includes a housing, at least one turbine, the/each turbine having an axis of rotation and an inlet, at least one guide vane adapted to guide an incoming flow of fluid towards the/each turbine inlet, the flow of fluid, in use, approaching the apparatus in a direction substantially perpendicular to at least one turbine axis and at least one generator for converting rotation of the/each turbine into power.