Researchers from LUT University in Finland have highlighted the importance of achieving cost-competitiveness in green hydrogen production through optimization strategies. Green hydrogen is a key player in decarbonizing heavy industries and serves as a vital component in Power-to-X technologies. By replacing fossil fuels with green hydrogen, significant emissions reductions can be achieved in sectors like metal production, transportation, and chemicals. The study emphasizes the significance of incorporating water electrolyzers into the electricity grid to enhance flexibility. Green hydrogen can act as energy storage for intermittent renewable energy sources, contributing to grid stabilization. The optimization approach involves simulating off-grid electrolyzer plants using solar PV, wind power, and batteries for energy storage. Results indicate that utilizing batteries for energy storage improves stability and mitigates shutdown risks during low renewable energy production periods. However, cost-effectiveness is dependent on battery prices. The study also considers component degradation, replacements, and operational expenses in optimizing hydrogen plant dimensioning and control. Based on the study, wind power is identified as the most cost-effective configuration in southeastern Finland, with the potential for the LCOH₂ to reach €2/kg by 2030. Future projections suggest that integrating solar PV and batteries will become optimal by 2035-2040. The findings position green hydrogen as a competitive alternative to grey and blue hydrogen, showcasing its potential for cost-competitiveness. The research also focuses on baseload green hydrogen supply, optimizing plant control and component capacities to minimize costs over a 30-year lifespan. The optimal plant configuration includes a combination of solar PV, wind farms, and a battery system for energy storage. This design minimizes hydrogen supply costs, emphasizing the importance of considering specific hydrogen demand rates for cost-effectiveness.