Abstract: Provide a hydroelectric power generation system that can increase generation efficiency by keeping the rotational resistance of the runner low, while preventing water contamination at the same time. The hydroelectric power generation system has: a first water storage tank 20 with a high-pressure water injection port 21 on the bottom face; a runner 40 which is stored in a condition of floating in the first water storage tank; and multiple transmission members 50 that contact the outer periphery surface of the runner and transmit the rotational force of the runner to the principal axis of rotation 61 in the generator unit 60.

Abstract: A hydroelectric power generation system has: a first water storage tank with a high-pressure water injection port on the bottom face; a runner which is stored in a condition of floating in the first water storage tank; and multiple transmission members that contact the outer periphery surface of the runner and transmit the rotational force of the runner to the principal axis of rotation in the generator unit. The runner has an introduction pipe that rises upward from an opening at the center of a bottom face to introduce high-pressure water; first guide pipes that extend radially from around the introduction pipe; and first injection nozzles provided at the tips of the first guide pipes, wherein the reactive force of the high-pressure water injected is utilized to turn the runner.