Money is pouring into clean hydrogen as policymakers and private investors increasingly realize that the fuel and feedstock will soon become a cornerstone of the energy transition and decarbonization efforts. But to date, a key component of the clean hydrogen economy has been overlooked – large-scale transportation to get clean hydrogen from production sites to points of use. This report assesses three hydrogen carrier technologies – liquefied hydrogen, ammonia and liquid organic hydrogen carriers (LOHC) – and analyze their costs and feasibility, with a focus on Europe.