When 28 Hydrogen Buses Have To Carry A €7.6 Million Refueling Station

Saarbahn’s recent inauguration of a €7.6 million hydrogen refuelling station in Saarbrücken marks a significant shift from merely acquiring hydrogen buses to operating a comprehensive hydrogen transit system. The facility supports 28 Wrightbus Kite Hydroliner fuel-cell buses, providing essential infrastructure including three 350 bar dispensers, storage, trained personnel, and safety measures. While hydrogen buses offer operational advantages in Saarbrücken’s hilly terrain and demanding routes—some exceeding 300 km daily—the true cost dynamics emerge with the refuelling station, highlighting the complexity beyond vehicle procurement. The economics of Saarbahn’s hydrogen programme reveal challenging cost structures. Although the city benefits from federal subsidies totalling over €11 million for buses and infrastructure, the station’s capital and operational costs impose a substantial financial burden. With an estimated annual hydrogen throughput of around 220 tonnes under ideal conditions, actual system reliability is expected nearer to 80%, reducing effective throughput and increasing per-kilogram infrastructure costs. Operating expenses alone could add more than €4 per kilogram of hydrogen, significantly inflating the overall fuel cost beyond production and delivery. Fuel pricing further complicates the economic picture. Delivered hydrogen costs are estimated at approximately €13.50 per kilogram, making hydrogen fuel around 23% more expensive per kilometre than diesel and over three times the cost of battery-electric energy. When factoring in the refuelling station’s capital and operating expenses, hydrogen’s competitiveness diminishes further. Comparisons with diesel and electric buses underscore the ongoing challenge for hydrogen to achieve cost parity, despite its operational benefits in certain transit scenarios. Saarbahn’s experience also serves as a cautionary tale, reflecting broader industry concerns about the longevity and reliability of hydrogen infrastructure. The example of Aberdeen, where hydrogen buses were sidelined due to supply and refuelling difficulties, illustrates the risks of premature or limited-scale investment. Saarbahn has not committed to a full hydrogen fleet conversion, signalling a pragmatic approach that allows reassessment based on operational outcomes and cost-effectiveness before expanding beyond the current 28 buses. Looking ahead, Saarbahn plans to integrate green hydrogen production from 2028, leveraging a local wind-powered electrolyser supported by regional funding. While this may reduce fuel costs and environmental impact, it will not retroactively improve the economics of the existing station. The case highlights the critical importance of scale, reliability, and long-term planning in hydrogen transit projects, emphasising that infrastructure investment and operational efficiency are as crucial as vehicle technology in determining the viability of hydrogen buses.