The global demand for clean energy sources has positioned hydrogen as a key player in the energy transition, offering an environmentally friendly option for various industries. Companies are shifting towards green hydrogen production, driven by the need for sustainable solutions and decarbonization. Integrating digital twins into hydrogen production processes presents a significant opportunity to enhance efficiency and reduce costs. By simulating real plant operations, engineers can optimize designs, detect issues early, and streamline development, ultimately accelerating production. Standardization is crucial in ensuring seamless interoperability in the evolving landscape of modular greenfield plants. Digital twins provide a virtual representation of physical reality, aiding in understanding, managing, and predicting performance. Utilizing process simulation tools for modular systems refines engineering concepts and streamlines automation design. With a focus on electrolyzers, critical components in green hydrogen plants, the article highlights the importance of digital twins in improving efficiency and reducing time to market in the hydrogen industry.