NewBusFuel (New Bus ReFueling for European Hydrogen) is a European research project with the aim of planning refuelling infrastructures for entire bus fleets. So far, systems for hydrogen production and refuelling have been built and operated for bus fleets of up to 10 fuel cell buses. This project aims to plan large systems for hundreds of buses and to define the requirements for the location, design, operation, and safety of large systems. Therefore, this project provides building blocks for the commercialization and rollout of the technology.