Greece is a country with high geothermal energy potential. Yet, its utilisation is limited to direct uses (Direct uses refer to the applications of balneotherapy, greenhouse heating, soil heating, aquaculture, drying of agricultural products, space heating and district heating) and Ground Source Heat Pumps (GSHPs), as there is a total absence of geothermal power production, which to a great extent is due to the local societies’ opposition created by the bad experience of the Milos Island pilot power plant (1970–80’s). This experience has affected the attitude of local communities and authorities against the large-scale exploitation of high-temperature deep geothermal resources (Any use of geothermal energy with heat extraction, for resources with temperatures above 90 °C) in various areas; on the contrary, low-temperature deep geothermal (Any use of geothermal energy with heat extraction, for resources with temperatures between 30 °C and 90 °C) utilisation is perceived much more positively. Until now, most attempts to exploit geothermal fields are characterised by the lack of local societies’ awareness, involvement and engagement. Exploiting the immense potential of geothermal energy requires an increase of awareness and improvement of the lost confidence of local societies towards high-temperature deep geothermal exploitation.