Increasing the uptake of renewables via energy storage at historical urban sites (the case of Lendava library in Slovenia)

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Narrative

As part of the larger Interreg project Store4HUC, the main objective of the pilot project was to replace the existing oil boiler in the Lendava municipal library with a renewable energy source. The building was connected to the existing geothermal district heating network. The Lendava library building is the last connection in the geothermal district heating network and the supply is not stable - the temperature of the supply medium is not constant. In the pilot project, the choice of the storage tank was crucial for the conversion to renewable energy. In this case, paraffin cells were installed as modern and innovative buffer storage systems designed to efficiently store heat from small irregular energy sources. These cells require less space compared to traditional water storage systems. By including heat storage in the system, the use of (district) geothermal heat could be optimised and the user comfort increased.

Financial data

Whole Interreg project: EUR 1,726,608 (EUR 1,419,515 by ERDF)

Recommendations

Thermal energy storage technologies and geothermal district heating systems have the potential to play an important role in the transition to 100% renewable energy systems by increasing system flexibility and overall efficiency, thereby reducing CO₂ emissions, securing household energy supplies, and additionally reducing heating costs.