Hydrogen Mega-Yacht Project 821: Pioneering Seafaring with Renewable Energy
The world's first hydrogen-powered superyacht, known as Project 821 or Breakthrough, has been launched and is now available for sale. This 118.8-meter vessel, built by Dutch shipyard Feadship, was delivered in May 2025 and is a pioneering example of sustainable maritime propulsion technology.
Key features of the Project 821 yacht include:
- Length: 118.8 meters (390 feet)
- Beam (Width): 19 meters
- Draft: 5.05 meters
- Gross Tonnage: Approximately 7,247 to 7,250 GT
- Accommodation: About 30 guests and 44 crew members
- Propulsion: A hybrid system combining hydrogen fuel cells and conventional diesel-electric engines. The hydrogen system supports hotel load and coastal cruising, but not yet transoceanic travel.
- Fuel: Cryogenic liquid hydrogen, requiring bespoke refueling infrastructure and regulations.
- Design philosophy: Emphasising sustainability and climate-conscious engineering, the yacht features serene, residential-style interiors and a range of luxury amenities such as pools, a cinema, a mini hospital, and an underwater 'Nemo' lounge.
The Project 821 yacht is powered by a 3.2 MW fuel cell system, generating electricity with zero harmful emissions, making it a significant step towards reducing the yacht's environmental footprint during typical use phases like hotel load and coastal cruising.
The yacht's fuel cells, cryotank, switching equipment for the DC power grid, and vent stacks for water vapor exhausts increased the overall length of the yacht by approximately 14m. The pressurised double-wall cryogenic 92m2 fuel tank on board keeps hydrogen at a temperature of -253°C.
It is reported that Bill Gates, known for his investments in clean energy innovations, ordered the yacht, aligning with his broader environmental commitments through Breakthrough Energy. The project represents a major milestone in maritime propulsion technology, requiring extreme precision and innovative safety measures due to the risks of hydrogen use.
The superyacht is expected to be the largest yacht displayed at the Monaco Yacht Show 2025, symbolising a bold step in sustainable superyachting. The vessel's price is confidential, but it is estimated to be well north of half-a-billion euros.
The construction of the Project 821 yacht took five years to complete. The yacht's battery bank acts as a buffer storage facility between the fuel cells and the twin 3,200kW electric ABB pod thrusters. The yacht's tanks can also store methanol, which can be converted into hydrogen to extend its fuel-cell range.
The Project 821 yacht can cruise for a week at 10 knots with a full tank of hydrogen, accounting for usual hotel load requirements. Its maximum speed is 17 knots, and its range at a 14-knot fast-cruise is 6,500nm.
The superyacht uses electro-chemical fuel-cells to convert green hydrogen into electrical energy. The hydrogen used by the superyacht is a relatively abundant resource. It takes 16 compact 185kW fuel cells to provide enough energy for the superyacht's battery bank.
Project 821 is the world's first hydrogen-powered superyacht, setting a new standard for sustainable maritime travel. The yacht is now for sale through superyacht broker Edmiston.
- The world's first hydrogen-powered superyacht, Project 821 or Breakthrough, boasts a length of 118.8 meters and is now available for purchase.
- Delivered in May 2025 by Dutch shipyard Feadship, this pioneering vessel is a testament to sustainable maritime propulsion technology.
- The Project 821 yacht is equipped with a 3.2 MW fuel cell system, generating electricity with zero harmful emissions, significantly reducing its environmental footprint.
- The yacht's design philosophy emphasizes sustainability and features serene, residential-style interiors and luxury amenities such as pools and an underwater 'Nemo' lounge.
- The yacht's battery bank acts as a buffer storage facility between the fuel cells and the twin electric ABB pod thrusters, enabling it to cruise for a week at 10 knots with a full tank of hydrogen.
- The construction of the Project 821 yacht required five years of precise engineering and innovative safety measures, given the risks associated with hydrogen use.
- Bill Gates, known for his investments in clean energy innovations, ordered the yacht, aligning with his broader environmental commitments and supporting the renewable-energy and environmental-science industries.
