Published by Todd Bush on November 11, 2024
SWITCH Maritime, the US shipowner that successfully launched the first hydrogen-powered ferry in the US, is pushing ahead with its next industry-leading, zero-emission vessel project. In collaboration with LH2 Shipping and LMG Marin in Norway, SWITCH plans to commence the US construction of the existing 80-car, 300-passenger RoPax vehicle ferry design (DNVGL-classed) that is successfully operating in Norway on liquid hydrogen (LH2) fuel.
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“What I like about LH2 fueling is that it will follow the same IGF Code that applies to cryogenic LNG fueling of ships in the US, so we have a precedent regulatory framework to work from.”
“SWITCH is proud to be at the forefront of the energy transition in US maritime shipping,” said Pace Ralli, Founder & CEO of SWITCH. “With rigorous planning, state-of-the-art engineering, and support from leading industry partners and the US Coast Guard, we are ready to pioneer zero-carbon LH2 fueling for heavier, higher-horsepower workboats.”
SWITCH’s first hydrogen-powered vessel, the Sea Change, is a 75-passenger catamaran ferry featuring 600 kW of electric motor propulsion, powered by 360 kW of fuel cells with 246 kilograms of gaseous H2 (GH2) storage at 250 bar pressure. The Sea Change successfully started public passenger service as part of the San Francisco Bay Ferry system in July 2024, after receiving its final Certificate of Inspection (COI) from the US Coast Guard in May 2024. It is currently fueled once a week using a mobile compressed GH2 storage trailer towed behind a pickup truck. Each fueling takes approximately 2 hours to transfer 150 kilograms, allowing for three consecutive days of passenger operation. When ferry service increases to 7 days per week in the coming months, the Sea Change will be fueled twice per week.
While SWITCH is supportive of all zero-emissions vessel technologies, it has focused on hydrogen for its potential to serve as a viable option where other battery-only solutions fall short due to space and weight constraints. Hydrogen as a fuel source can support greater range and power requirements due to its high energy density. Additionally, it simplifies zero-emissions vessel operations by eliminating the need for fixed shoreside charging infrastructure, allowing for fueling through established truck-to-ship or ship-to-ship practices. Compressed GH2 is well suited for small- to medium-sized vessels; however, as vessel size and energy demand increase, cryogenic LH2 becomes the preferred storage solution. Similar to Liquefied Natural Gas (LNG), cryogenic LH2 supports faster refueling speeds for large volumes (e.g., tons per hour).
In addition to the Sea Change, SWITCH is working on a 150-passenger, 25-knot catamaran for the SF Bay Ferry service, using the same gaseous H2 (GH2) storage and fuel cell equipment as the first vessel (to be revealed in Q1 2025). When designing larger zero-emissions harborcraft such as 300+ passenger ferries, vehicle ferries, and harbor tugs, SWITCH plans to transition from gaseous storage to cryogenic liquid H2.
“Our first H2 vessel was the result of years of close collaboration with the US Coast Guard, demonstrating the viability and safety of hydrogen fueling,” says Pace Ralli. “While the LH2 RoPax ferry design is already DNVGL-classed, there is still some work to do to bring it into US Coast Guard compliance.”
The larger steel hull of the vehicle ferry offers more flexibility in terms of space and weight compared to aluminum catamaran fast ferry designs, making it an ideal platform for introducing LH2 fueling in the US. The LH2 from the cryogenic storage tanks is vaporized onboard and used in the PEM fuel cells to create electricity for the electric motors. Like the GH2 fast ferries, the vessel’s only emissions will be pure H₂O vapor, with zero carbon or other diesel-related emissions.
The RoPax vehicle ferry will have a service speed of 14 knots and is expected to require fueling only once per week (volume of 3000 kilograms from one LH2 truck) in typical operation, with no requirement for shoreside electric charging infrastructure. Its Norwegian predecessor, the MF Hydra, is owned by Norled and performs a triangular six nautical mile round-trip vehicle ferry service, fueling LH2 only once every two weeks. The 4-tonne LH2 tank (about the size of a 40 ft container) fits easily on the top deck and receives fuel from an LH2 truck via a bunkering system using over-pressure in the truck to push the liquid to the ship. To date, MF Hydra has successfully received LH2 fuel approximately 50 times since starting hydrogen-powered operation in March 2023 and, notably, has not been out of service since operations started, other than for planned maintenance.
SWITCH aims to accelerate the adoption of net-zero vessels by bearing the regulatory and construction risks for existing operators and offering the ability to lease the new vessels after completion – a form of the ‘hardware-as-a-service’ model increasingly being utilized to accelerate the energy transition of hard-to-abate industrial sectors. The SWITCH solutions are flexible and tailored for vessel operators needing to comply with emissions regulations, providing a streamlined path to transitioning to a carbon-neutral fleet over time.
Website: www.switchmaritime.com
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