Tugboat Powered By Ammonia Sails For the First Time

A startup called Amogy has successfully converted a 67-year-old diesel tugboat to run on clean ammonia, marking a significant milestone in the transition to zero-emissions propulsion in the maritime industry. The Associated Press reports:

Amogy’s system uses ammonia to make hydrogen for a fuel cell, making the tug an electric-powered ship. The International Maritime Organization set a target for international shipping to reach net-zero greenhouse gas emissions by, or close to, 2050. Shipping needs to cut emissions rapidly and there are no solutions widely available today to fully decarbonize deep-sea shipping, according to the Global Maritime Forum, a nonprofit that works closely with the industry. There is a lot of interest in ammonia as an alternative fuel because the molecule doesn’t contain carbon, said Jesse Fahnestock, who leads the forum’s decarbonization work. Ammonia is widely used for fertilizer, so there is already infrastructure in place for handling and transporting it. Ton for ton, it can hold more energy than hydrogen, and it can be stored and distributed more easily.

The tugboat ran on green ammonia produced by renewable electricity. A 2,000-gallon tank fits in the old fuel tank space, for a 10-to 12-hour day at sea. It splits liquid ammonia into its constituents, hydrogen and nitrogen, then funnels the hydrogen into a fuel cell that generates electricity for the vessel without carbon emissions. The process does not burn ammonia like a combustion engine would, so it primarily produces nitrogen in its elemental form and water as emissions. The company says there are trace amounts of nitrogen oxides that it’s working to completely eliminate.

Amogy first used ammonia to power a drone in 2021, then a tractor in 2022, a semi-truck in 2023, and now the tugboat to prove the technology. Woo said their system is designed to be used on vessels as small as the tugboat and as large as container ships, and could also make electricity on shore to replace diesel generators for data centers, mining and construction, or other heavy industries. The company has raised about $220 million. Amazon, an enterprise with immense needs for shipping, is among the investors. Nick Ellis, principal of Amazon’s $2 billion Climate Pledge Fund, said the company is excited and impressed by what Amogy is doing. By investing, Amazon can show ship owners and builders it wants its goods delivered with zero emissions, he added.