Towards a climate neutral EU:
efficient allocation of EU funds

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

Organisation: Umanotera Website: Added: July 07, 2023
Project start date: April 01, 2019
Project end date: March 31, 2022


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)


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.

Information sources

Recipient's website

Other info

European Climate Initiative (EUKI)
This project is part of the European Climate Initiative (EUKI). EUKI is a project financing instrument by the German Federal Ministry for Economic Affairs and Climate Action (BMWK). The EUKI competition for project ideas is implemented by the Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH. It is the overarching goal of the EUKI to foster climate cooperation within the European Union (EU) in order to mitigate greenhouse gas emissions.