The UK, US and Japan face similar challenges and opportunities when it comes to decarbonising their energy sectors. The three countries are blessed with abundant offshore wind resource, their economies are built around energy-intensive industries and their onshore electricity networks are ageing. Coupling offshore wind with green hydrogen production, especially in areas with constrained grid infrastructure, could be the missing piece of the decarbonisation puzzle. The most important cost element of green hydrogen production is the cost of the electricity feedstock itself, in this case the levelised cost of offshore wind power generation. Xodus developed a bottom-up techno-economic tool built around geospatial parameters to calculate the cost of hydrogen production from offshore wind. The tool includes three different layouts: onshore, centralised offshore and decentralised offshore hydrogen production as well as different onshore tie-in points and pipeline selection module for the offshore layouts. The outputs from the tool can then be used to compare costs across different regions and geographies. Apart from the cost of hydrogen production and delivery, it is also important to assess the potential demand sectors and the policy landscape to understand the full picture. Therefore, the presentation will not only elaborate on the cost of hydrogen production outputs but also on the demand and policy aspects within each country, and how these are aligned with their offshore wind project development pipelines and net zero targets.