Abstract: In a hydrokinetic turbine-generator system having more than one turbine-generators aligned into a water stream for conversion of hydrokinetic energy to electrical energy, the improvement wherein the more than one turbine-generators are direct-drive electrical generators configured to control generator current such that residual torque on the system is balanced using electronic torque control.

Abstract: In a hydrokinetic turbine-generator system having one or more turbine-generator aligned into a water stream for conversion of hydrokinetic energy to electrical energy, the improvement whereby the one or more turbine-generators are direct-drive electrical generators controlled such that residual torque on the system is balanced using electronic torque control.

Abstract: Apparatus for positioning a hydroelectric turbine/generator in a dam having at least two spaced piers, the apparatus comprising (a) at least one first gate each spanning the space between a respective pair of neighboring piers and being movable to closed and open positions and positions therebetween to control flow and maintain head; and (b) at least one second gate, each second gate associated with a corresponding first gate upstream thereof and supporting at least one hydroelectric turbine/generator in a maintenance position and a plurality of operating positions such that in operating positions, water flows through each turbine/generator to produce electric power.