an electromechanical energy conversion system includes a variable capacitor , an electronic charging / discharging unit and a power source / sink ; the power source / sink being coupled to the electronic charging / discharging unit which is coupled to the variable capacitor ; the variable capacitor including first and second electrodes that are separated by an intermediate medium providing a gap distance therebetween ; the gap distance being adjustable between a minimal distance and a maximal distance as a function of an externally applied mechanical force ; the electronic charging / discharging unit being arranged for charging the variable capacitor from the power source / sink at substantially a state of the variable capacitor when the gap distance is minimal and the area of the elastically deformed body maximal , and for discharging the variable capacitor to the power source / sink at substantially a state of the variable capacitor when the gap distance is maximal and the area of the elastically deformed body minimal .