The current energy status is characterized by an increase in energy consumption and for each country, including the Republic of Croatia, the main task is to provide sufficient energy while remaining as independent as possible. When climate change and energy transition with a view to decarbonisation are included in the reflection on energy independence, the situation becomes significantly more complex. In this context, it is important to emphasize that renewable energy sources (RES) with energy efficiency (EE) and gas decarbonisation, and in the wider context of energy transition and expected climate change, are a very important element of energy security, sustainable energetics and climate change mitigation. The first step is to analyse the possible own energy sources. Over the last few decades, a great deal of attention has been focused first on hydro and biomass and then on wind and solar, which can be considered logical given the potential as well as the maturity and cost of the technology. However, when comparing the potential and the current use, then it is necessary to take geothermal energy into account. The indicated geothermal potential of all locations in the Republic of Croatia could result in production capacities exceeding 500 MWe, between 750 and 1,300 MWt and significant natural gas reserves. The use of geothermal energy has numerous advantages in the context of sustainable energy development, which can have a multiplying effect on the economy of the Republic of Croatia. This thesis presents the analysis of the geothermal potential and the current utilization of the geothermal energy in the Republic of Croatia. A detailed analysis of the first croatian project which uses geothermal energy for the agricultural purposes at Bošnjaci was conducted. Geothermal energy is used for heating of the greenhouses, where the geothermal energy has replaced the natural gas, as a source of energy.