Abstract: In one embodiment of the invention, a system may include a power generating means comprising a hot junction and a cold junction, a pump station, a high temperature source, and a low temperature source. The high temperature source may be thermally coupled by a first pipe system to the power generating means, wherein the high temperature source comprises heat from within the earth's surface. The low temperature source may be thermally coupled by a second pipe system to the cold junction, wherein the low temperature source comprises water from a body of water. The pump station is operable to cause a heat transfer medium to descend through the first pipe system to the high temperature source within the earth's surface and then to ascend through the first pipe system to the hot junction, generating electricity responsive in part to a temperature gradient between the hot junction and the cold junction.