Reducing the emissions and the environmental footprint is one of the main challenges for port cities. Even though in some cases, urban traffic might be the main pollution source, as the Port of Valencia (Spain) shows in a recent study, ports still play a crucial role. Although there is no silver bullet, a combination of existing solutions and new fuels like hydrogen is showing promising results. For example, in Lisbon (Portugal), the city announced a pilot project of a green hydrogen production station for vehicles, while the port will electrify its quays starting in 2022, reducing cruises pollution. In Valencia, the port will have a hydrogen refuelling station already in 2021, framed in the H2PORTS EU project. Other key green energy projects in Spain are going to take place in the port of Bilbao, where industry leader Repsol will invest €80 million. One project will be one of the largest net zero emissions synthetic fuel production plants, based on green hydrogen, while the other will be gas production plant from urban waste. The importance of hydrogen is visible in the national strategies of some countries, like Germany.