Abstract: A system for converting fluid pressure into electric energy includes a pair of storage tanks each having a fluid stored under pressure in a lower chamber, an air stored under pressure in an upper chamber, and a flexible diaphragm for separating the chambers. An air valve is connected to the upper chamber. A flow direction control is connected to each first chamber. A conduit connects the outlet port of the flow direction control valve to one of its three input ports. A flow rate control valve is interposed in series with the flow direction control valve. At least one electric generator is operable by the first fluid under pressure to generate electric energy. A reservoir and a fluid pump are also interposed within the conduit. A controller and battery are electrically connected to each of the pump, the flow rate control valve and the flow direction control valve.