NOVELTY - The method involves placing the primary heat exchanger coil adjacent to a source of heat in a surrounding environment. The primary heat exchanger coil is fluidly connected to a secondary heat exchanger coil located in a colder environment with a closed loop system comprising thermally insulated pipes. The fluid is circulated through the closed loop system by use of an in-line pump. The heat is transferred from heat source to the circulating fluid inside primary heat exchanger coil. The heated fluid is transported to the secondary heat exchange coil for external use.    USE - Method of using self-contained geo-thermal heat exchanger (claimed).    ADVANTAGE - The cheap and clean electric energy can be provided continuously from geothermal renewable source. The self contained geo-thermal heat exchanger system can be used in reverse order to heat the ground adjacent solidified oil formations in order to liquefy it for easier extraction to the ground surface. The hydrostatic pressure can be reduced. The carrying cables, supply tubes, coolant tubes, control cables and electric cable are at appropriate length segmented to be easily attached and reattached to the cables connector platforms. The external structural cylinder of the boiler has external and internal indentations to increase conductive surface and to increase conductivity of heat to the water inside boiler. The necessary level of water inside the boiler of the self contained in-ground geothermal generator can be supplied and regulated from control room on ground surface. The assembling tower can be used as a platform for wind mill if geothermal power plant is located in windy area. The method of producing electric energy can be used in global climate crises.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a self contained geo-thermal heat exchanger; and    (2) an in-line pump.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the heat exchange system with main segments including a close loop line and two heat exchangers.    Close loop tube (72)    Main caring cable (75)    In-line water pumps (172)    Coiled pipe (188)    Strait pipe (189)