A power generating system in a dam or impoundment where a section is removed by precision saw cutting to create a void or a base placed adjacent to the dame or impoundment is inserted for the mounting of a turbine frame with a plurality of power generating cells comprising a turbine and a generator and a second removed section to create voids for outlet draft tubes where the turbine frame is matably inserted in the first void, the turbines in said frame are positioned to permit water flow through the turbines and out the voids for outlet flow, and the turbines are operably engaged to a plurality of generators for generating power from the movement of water across the turbines. The cells may be mounted on top of a dam weir after precision removal to create a base and may have added draft tubes for water flow.