Turkey is an energy importing country; more than half of the energy requirement has been supplied by imports. Oil has biggest share in total primary energy consumption. Besides this, Turkey is one of the countries with significant potential in geothermal energy. Resource assessments have been made many times by the General Directorate of Mineral Research and Exploration (MTA) of Turkey. The main uses of geothermal energy in Turkey are: space heating and domestic hot water supply, greenhouse heating, swimming and balneology, industrial processes, heat pumps and electricity generation. Since the geothermal resources are mostly moderate and low temperatured in Turkey, they are generally used for direct use purposes.

In this regard, Diyadin Geothermal Energy Integrated Project (DGEIP) is one of the most important applications in Turkey due to its integrated investment. The major areas of this integrated direct utilization are (1) district heating, (2) agriculture (greenhouse heating), (3) bathing and balneology (thermal hotel), (4) aquaculture (fishing pond), (5) industrial processes (liquefied carbon dioxide and precipitated calcium carbonate productions). The system, of which subsections are briefly described in the paper has a total of six wells, of which three are currently in operation and totally a volumetric flow rate of 750 liter per second with average well-head temperature of 78 ?C.

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