Disclosed is a system for generating electrical power using flowing water in canals, rivers and the like water streams. The system comprising: plurality of circular structures, each having a bore at the center and plurality of elongated arms being fixed on the outer periphery of said structure; plurality of blades being fitted on said plurality of elongated arms; a rotating shaft for rotatably accommodating in space apart relationship said circular structures over outer body of said shaft through said bore; an electrical generator for converting the mechanical energy generated by rotation of said shaft into electrical energy to produce electrical power; and a transmission device for transmitting the mechanical energy generated by rotation of said shaft from shaft to said electrical generator; wherein said circular structures along with blades are kept across the flow of water, the blades of said structure get rotation due to force of flowing water and generate energy which rotates said shaft which in turn generate mechanical energy and finally said mechanical energy is transmitted to electrical generator through transmission device for generating electrical power.