An electricity generating system includes a first electrode located at a first location in a body of salt water and a second electrode located at a second location in the body of salt water. The first and second electrodes may be of the same or different materials and are designed to present a large surface area to the body of water. A direct current flows between the two electrodes which is a function of the salinity of the water and the composition of the electrodes. The direct current is applied to the input port of a converting device which may be any suitable power inverter which can produce a output AC voltage corresponding to the direct current or a DC to DC converter to produce an output DC voltage corresponding to the direct current.