Within the framework of the project Store4HUC, co-funded by the European Union through the Interreg Central Europe programme, where LARES is involved, a public building in the municipality of Lendava was converted from fossil fuels to renewable energy. Symbolically, on World Earth Day, 22 April 2021, the Mayor of the Municipality of Lendava, Mr. Janez Magyar, handed over the pilot project in the field of renewable energy and its storage. At the handover of the modernized boiler room in the Lendava Library building, which will henceforth be heated by geothermal energy, the Mayor of Lendava highlighted the municipality's efforts to become recognizable as a green tourism destination: "With small steps, but persistently, we contribute to the carbon-free society, as we are aware of the importance of preserving nature and natural resources, so we decide to make the most of renewable energy sources." The pilot infrastructure is a latent heat storage system combined with geothermal energy. This will reduce energy costs, which will also have a positive impact on greenhouse gas emissions. The Municipality of Lendava is aware of its role and supports projects that have a positive impact on the environment. The project can also be a good example and encouragement both locally and in the wider environment.

The latent heat storage based on phase-change materials represents a challenge for energy management as its model is highly nonlinear. LARES contributes here with development of an energy management procedure based on mixed-logical-dynamical systems and predictive control that unlocks the full potential of such a storage system such that the operators of the plant can be advised how to improve the system performance for the one-day-ahead operation horizon. Careful planning almost fully eliminates the need for engagement of the oil-based backup system and thus enables a completely carbon-free heat supply of the library in Lendava.