Nowadays finding a sustainable energy source for the future is one of the more urgent priority for human being. Hydrogen is an energy carrier and may be produced from another substance. Hydrogen is not widely used today but it has great potential as an energy carrier for future.

Hydrogen can be produced from different resources (water, fossil fuels, biomass, geothermal) and it products of chemical processes. Among the use of non fossil energy sources for hydrogen production, geothermal energy seems an important alternative.

Geothermal energy is a form of renewable energy derived from heat deep in the earth’s crust. This heat is brought to the near-surface by thermal conduction and by intrusion into the earths crust of molten magma originating from great depth. As groundwater is heated, geothermal energy is produced in the form of hot water and steam. Geothermal fluids at depth are complex mixtures of dissolved gases and solids. The major gases in the non - condensing gas phase consist of carbon dioxide, hydrogen sulfide, ammonia, nitrogen and hydrogen. Concentrations of these major gases will change among wells in the same geothermal area. One of the major component of gas composition, hydrogen sulphide, is especially found in high- temperature geothermal fluids (>150 ºC). The reaction of sulfur is probably formed by a few following mechanism such as, present in reservoir rocks with hot water, magmatic functions and metamorphism of sedimentary rocks. Concentration of this gas sampled from geothermal fluids in USA range from 0.18 to over 50 mg/l. Turkey is also has rich geothermal areas that have high enthalpy in Western Anatolia. Depends on tectonic regime, the area has so many geothermal locations and some of them have over than 190 ºC geothermal fluids. In Kızıldere / Denizli region dry ice (solid CO2) has been produced by geothermal fumerols.

In this paper, applicability of geothermal energy to the production of hydrogen has been discussed and the available techniques of hydrogen production from hydrogen sulfide, especially thermo-chemical and electrolysis, have been investigated.

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