A hydrokinetic generator including: a submersible housing defining a conduit therethrough for the flow of a fluid; a turbine mounted to the housing comprising at least one impeller located in the conduit for rotation by said flow; and at least one electrical generator coupled to the at least one turbine for converting mechanical energy from the turbine to electrical energy, the electrical generator including a plurality of elongate members bearing one or more magnetic regions, the elongate members being disposed about the at least one impeller and fast therewith; and a number of windings located within material of the housing and arranged for electromagnetic interaction with said magnetic regions whereby in use rotation of the impeller moves the magnetic regions past the windings to thereby induce an electrical current in the windings. The impeller may comprise a plurality of spiral, helical blades disposed about a common axle from a leading end thereof to a trailing end wherein a radius of the blades increases exponentially from the leading end to the trailing end.
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