The gas transmission system operators of Greece, Bulgaria, Romania, Hungary, Slovenia, and the Czech Republic are in discussions to create a hydrogen corridor extending to Germany to meet the latter's increasing demand for hydrogen imports. The plan is still in its early stages, focusing on infrastructure upgrades to enable hydrogen transportation, with Romania identified for requiring the most substantial system enhancements. The initiative, not yet part of Greece's DESFA investment program or the EU's projects of common interest, draws inspiration from the Vertical Gas Corridor for natural gas delivery to Ukraine. In parallel, developments like the Green Aegean electricity transmission project and the North-South Electricity Corridor are advancing the region's energy connectivity. However, while renewable energy projects are flourishing in Greece and the surrounding countries, the green hydrogen sector faces challenges. Some projects have been abandoned, causing concerns about premature investments. Notably, the Green HiPo project in Western Macedonia was removed from Greece's development plan, contrasting with Motor Oil's progress in establishing an electrolyzer for green hydrogen production by 2026. Despite market rationalization due to stalled initiatives, regional advancements like Serbia's pilot project for green hydrogen with a German partner signify steps towards sustainable energy practices.