Researchers from the Italian Ministry of Environment and Energy Security and the Polytechnic University of Turin have developed a new model for estimating the cost of hydrogen production based on the sizes of plant components. The study focused on analyzing green energy systems and explored different scenarios including PV power-only, wind power-only, solar-wind hybrid production, and hybrid production with battery storage. By conducting a sensitivity analysis on investment costs for power-to-hydrogen technologies, the researchers aimed to identify the most cost-effective design ratios. The simulation, based on typical weather data from Italy, considered various capacity factors and investment costs for different components such as PV, wind, battery storage, and electrolyzers. The results showed that PV-powered hydrogen in Italy could achieve a levelized cost of hydrogen of €5.11/kg with a PV ratio of 2.2. The study also projected cost reductions for hydrogen production in the future, with estimates dropping to €3.28/kg in 2030 and €2.04/kg in 2050. The optimal hybrid solution was found to have a lower cost compared to PV or wind-only configurations. However, introducing battery storage was deemed economically unviable. The researchers emphasized the importance of providing guidelines for properly sizing power-to-hydrogen plants to minimize production costs and improve the competitiveness of low-carbon hydrogen in the market. The findings of the study were detailed in a paper published in Energy Conversion and Management.