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As the global energy transition unfolds, the adoption, uptake, and application of digital tools in the renewable energy sector is transforming delivery and workflow processes, enhancing efficiency and accountability.

As Australia’s population accelerates toward an estimated 39 million by 2050, the challenges of waste generation and resource management grow more complex. To address this, the Australian Government has launched a Circular Economy Framework, a roadmap to double the nation’s circularity by 2035.

This paper presents a comprehensive methodology for designing and modelling Green Hydrogen Systems developed by Surbana Jurong (SJ) and SMEC, known as S2H2. The methodology integrates traditional systems engineering with innovative elements to optimise performance, reliability, and sustainability across the entire project lifecycle.