The city of Galanta (pop. 16.500) is situated in the SW part of Slovak Republic, about 50 kms NE from the capital city, Bratislava. Galanta pioneered in the use of renewable energy sources among the countries behind the “Iron Curtain” by developing its own geothermal-based district heating system in the early 1980s. The two production wells (FGG-2 (drilled in 1982) and FGG-3 (in 1984)) - tapping into the reservoir of Upper Pannonian sandstone (similar to the one at Morahalom) at 2101m and 2102m depths respectively - provide the necessary quantity (regulated 20-25 l/s each) of the 78°C geothermal fluid for a whole district of the city, where it is utilised as a heating agent and also for DHW purposes.Read more

Prior to the launch of the project multiple apartment buildings, a hospital, an elderly home, a nursery and an elementary school was connected to the heating system. The current legislative framework in effect doesn’t regulate reinjection, which accounts for the discharge of about 0.5 million m3 of used, still warm and highly mineralised thermal water into the surface waters with all its unfavourable impacts on the environment. Since introducing new policies for a more sustainable management of this natural resource was out of the scope of the GEOCOM project, local activities were focused on actions which could increase the overall efficiency of the existing setup by connecting additional estates (increasing the total heated floor area) to the geothermal loop and by improving the energy efficiency parameters of those buildings which are already benefiting from the service. Within the frame of the project the thermal capacity of the geothermal system was increased by 1239 kW. This investment has triggered the erection of three new municipal housing units (total 101 new apartments) and a few more facilities within the range of the district heating system which are today connected to the loop. The project focused at this demonstration site also on improving the energy efficiency of those estates which are supplied by the geothermal heat. For this reason 3 housing units, a kindergarten and a primary school were selected as subjects for the model retrofitting actions complemented by basic system integration measures.

Reinjection feasibility study

Despite the current legislative framework is not in favor of reinjection, it might change in the future, as more and more communities in the region will start utilizing the same aquifers for their own benefits and sustainable energy production will become an even more pressing issue. In order to be prepared and know how to deal with reinjection related tasks, Galanta had a full study made and delivered on the multi faceted subject of reinjection in the region. The hefty documentation details the geology-, engineering- and economy-related challenges of such a venture, making all parties and stakeholders fully aware of all those risks, costs and problems they might face if they will engage one day. For this work financial contribution was provided from the European Commission through the GEOCOM project.