We wanted to use liquid hydrogen because of its scalability, low-pressure storage, and the fact it can be a zero-emissions fuel. Liquid hydrogen provides more energy onboard in the same space and offers faster bunkering time when compared to compressed hydrogen or rechargeable batteries.
An advantage of the fuel cell solution is that we enhance endurance. By loading hydrogen onboard in sufficient quantities, we can operate on longer routes, sail faster, or operate larger ships with higher power requirements. With a battery solution, you need to charge every time you're in a port. So, if something is wrong with the charging station or for some reason you fail to get to it, you risk not being able to sail until the ferry has been charged, which can lead to delays and/or that you need to switch to using your back-up system running on diesel.
Our Hydra ferry will first enter service this summer using batteries for propulsion. The hydrogen system will be installed on the vessel during the winter low season, meaning the vessel will be in operation using liquid hydrogen and fuel cells next spring. Hydra is being built to carry 80 cars and almost 300 passengers between Hjelmeland, Nesvik, and Skipavik in Norway.