The production of hydrogen from fluctuating renewable energy sources is crucial for achieving a sustainable energy transition in Europe. This presentation focuses on the techno-economic analysis and system optimization of renewable hydrogen production, specifically within the context of European regulations. The challenges associated with ensuring a constant supply of hydrogen to consumers while utilizing intermittent energy sources such as wind and solar power will be explored. Additionally, the composition of costs under current technological parameters, including an analysis of capital expenditures and operational costs, will be examined. By providing insights into these critical aspects, this presentation aims to enhance the understanding of the complexities of fluctuating power supply and the role of wind and solar potential across Europe.