The buildings of the Potulice Penitentiary are located at al. Park 1 in Potulice. Potulice is a village in Poland located in the Kujawsko-Pomorskie Voivodeship, in the Nakło nad Notecią district. The project will consist of thermal modernisation of the building with the use of RES. The thermal modernisation works in the facility will consist of warming up the stropodache, warming the outer walls, warming the floor on the ground, modernisation of the central heating system using hybrid and central heating systems using hybrid solar panels, modernisation of ventilation and cooling system, replacement of windows and doors and exchange of lighting for energy-efficient. This work is eligible in accordance with the cost catalogue contained in the Guidelines on the eligibility of expenditure under the OP 2014-2020. The scope of works necessary to perform on the object is defined in the energy audit and lighting (ex ante audit).