This master thesis, authored by the undersigned, is a collaborative effort involving Politecnico di Torino, Universidad de Jaén, and Lublin University of Technology. The study focuses on a 1.4 MWp photovoltaic (PV) plant situated near Bordziłówka, Poland, approximately 77 km from Lublin. Installed in 2014, the plant faces challenging meteorological conditions, including frequent snowfalls and other extreme conditions which lead to inaccurate data readings. The aim of this study is to find an alternative method to evaluate whether the energy production of the plant aligns with predictions based on solar irradiance and temperature conditions. For this comparison, data measured from the plant (such as solar irradiance, temperature, and instantaneous power) will be analyzed and compared to data from a weather station located in Włodawa, approximately 44.8 km away.