Geothermal energy is one of the renewable energy resources with a vast potential. It is extended spatially in many areas, isolated from urban areas and direct uses, whereas its utilisation when it is not for electricity production is many times hampered due to lack of a proper development framework. In this work we present a design framework for sustainable geothermal systems incorporating modules covering the various aspects of exploration, utilisation, end-use and management. The overall framework consists of the following sub modules: a. geophysical model of the assessment of the geothermal reservoir capacity b. model for the management of the geothermal wells, pumping and re-injection c. model for the distribution network d. model for the various end-uses, e. environmental model for sustainable operation The overall framework incorporates the basic axes of sustainable development, i.e. resources, economy, environment, energy, technology, society. The theoretical framework is applied to an existing geothermal reservoir which at the current is being underutilized, from an energy, environmental and economic perspective. The search for an optimum design includes the formulation of different scenarios and the multi-criteria decision analysis of them.
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