Abstract: A fluid motor including a rotatable output shaft and a fluid inlet and a fluid outlet is provided for serial connection in a domestic water system supply pipe. A rotary electrical generator is also provided and the output shaft of the fluid motor is drivingly coupled to the generator. A bank of storage batteries is further provided and the generator includes a pair of electrical potential output conductors electrically connected to the bank of batteries through current regulating structure whereby the batteries may be recharged as a result of the fluid motor driving the generator. An auxiliary domestic electrical wiring system is provided and is electrically connected to the bank of storage batteries.