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Nuclear power at sea: Seattle startup targets Norway for ships and floating power plants

✇GeekWire
By: Lisa Stiffler
Part of the Emerald Nuclear team, from left: Erlend Haugsbø, head of engineering and testing; Hallgeir Juliebø, co-founder and chief commercial officer; and Wesley Deason, co-founder and CEO. (Emerald Nuclear Photo)

Emerald Nuclear today announced a $2.1 million award from The Research Council of Norway to support its efforts to bring nuclear energy to the shipping industry and offshore power. The Seattle-based startup is developing high-temperature gas reactors that use an encapsulated fuel designed to resist meltdowns.

“This award will enable Emerald Nuclear to work directly with our marine partners to validate integration of our technology with their state-of-the-art marine power distribution and control systems,” said Wesley Deason, co-founder and CEO.

The funding supports Norway’s Marine Nuclear Propulsion System Pilot project, which is being led by Emerald Nuclear’s Norwegian subsidiary.

Shipping accounts for roughly 3% of global carbon dioxide emissions, making it a significant target for lower-carbon energy solutions. Some ferries serving shorter routes are adopting hybrid-electric propulsion. Shipping companies are exploring methanol, ammonia, biofuels and other alternatives to heavy fuel oil, but their climate benefits depend on how those fuels are produced and used.

Nuclear reactors have powered U.S. Navy submarines for more than 70 years. Now, a new wave of companies is working to expand nuclear power’s role in commercial shipping and other marine applications.

The award supports an early development step for Emerald Nuclear, with substantial work remaining before commercial deployment. The company has yet to build its first reactor, and its plans will require additional financing, regulatory approvals and a reliable fuel supply. The startup has previously received an undisclosed amount of funding from angel investors.

Emerald Nuclear has five employees, most of them in Norway, and is targeting two applications: offshore ships that help construct facilities like oil platforms and wind turbines and lay deep-sea cables, and floating power plants for remote communities. Each reactor is designed to produce 5 megawatts (6,705 horsepower), according to the company.

Bringing nuclear to the marine environment poses several significant challenges. They include safety issues, regulations for vessels traveling internationally, management of nuclear fuel and waste, and the way shipping companies frequently buy and sell vessels.

Deason said the company’s approach helps address those concerns:

  • The reactor will use TRISO fuel, which consists of a uranium-containing kernel surrounded by protective carbon and silicon-carbide layers. The uranium is in short supply, but Deason is confident it will be available by the time the company is ready to deploy.
  • Nuclear regulations are still being developed for international vessels, though initial deployments will be within a single country’s jurisdiction.
  • Emerald Nuclear will have seaside manufacturing, providing easy access for ships and floating power plants that need installations, repairs and exchanges of fresh and spent fuel.
  • The company will lease, rather than sell, its systems, allowing customers to swap nuclear in or out depending on their needs.

Emerald Nuclear is designing its technology “to integrate with the unique power needs of the ship, but also to meet the ways that the maritime industry does business,” Deason said.

Other companies pursuing nuclear ship propulsion include Core Power, newcleo and Blykalla. Core Power, Westinghouse, Saltfoss Energy and Prodigy Clean Energy are also developing floating nuclear power stations. Russia’s state-owned Rosatom already has nuclear-powered icebreakers and a floating nuclear power plant in operation.

Prior to launching Emerald Nuclear, Deason, a nuclear engineer, worked for Ultra Safe Nuclear Corp. (USNC) developing reactors for space-based applications.

During his tenure at the Seattle company, a professor from the Norwegian University of Science and Technology approached USNC about applications for the maritime sector. USNC declared bankruptcy in October 2024 and the deal wasn’t pursued. But the idea interested Deason and Hallgeir Juliebø, a Norwegian entrepreneur who had been a consultant with USNC. The two co-founded Emerald Nuclear in 2024 and Juliebø serves as chief commercial officer.

Emerald Nuclear has signed a lease for an engineering center in Norway, where it’s designing and building its first prototype, a non-nuclear thermal device that will be used for the Marine Nuclear Propulsion System Pilot project.

Other partners for the project are VARD Group, Vard Electro, Island Offshore, Norwegian University of Science and Technology, Imperial College London and Maskindynamikk, bringing together nuclear technology, ship design and integration, vessel operations and academic research.

The startup will build its first nuclear reactor, named the Gem Microreactor, at the Norwegian University of Science and Technology, with 2030 as its goal for completion. Emerald Nuclear will integrate equipment from Peregrine Turbine Technologies in Maine to convert the reactor’s heat into electricity.

The target for the first commercial deployment is 2031, on a Norwegian offshore vessel.

Deason is hoping to open a manufacturing site in the future in Western Washington on Puget Sound with an initial focus on floating nuclear power systems that replace diesel generators. That phase of growth is roughly targeted to the early 2030s.

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Watching fruit ripen pays off: Seattle ag-tech startup Strella lands $4.25M

✇GeekWire
By: Lisa Stiffler
Katherine Sizov, CEO and co-founder of Strella, was recognized as a 30 Under 30 leader by Forbes. (Photo courtesy of Sizov)

Seattle-based ag-tech startup Strella has landed $4.25 million to expand the reach of its technology that monitors produce to prevent spoilage and food waste.

The investment extends the company’s Series A round and brings its total funding to $26.25 million.

CEO and co-founder Katherine Sizov launched the startup in Philadelphia in 2019 and relocated its headquarters to Seattle four years ago to be closer to Washington’s fruit orchards.

Strella uses IoT devices to measure gases including ethylene, a plant hormone released by ripening fruit, and machine vision to monitor the produce. Its software interprets the fruit’s real-time conditions alongside data such as country of origin, packing date and varietal type.

The 19-person team serves customers in 26 countries and provides information to growers of apples, pears, avocados and citrus. It recently added kiwifruit to the lineup.

“Our vision is to become the system of record for quality in the food supply chain, or the ‘guardian angels’ of produce as it passes from hand to hand,” Sizov said.

The company works with all of the players in the supply chain, including farmers, produce packers, shippers, distributors and retailers.

“The next step for us is to begin stitching all the pieces together to become a one-stop shop for quality and tackle the food waste problem at scale,” Sizov said.

The United Nations estimates that roughly 33% of food intended for humans worldwide is lost or wasted, totaling $940 billion in annual economic losses. Waste in the U.S. is even worse, at about 40% of edible food and $218 billion each year.

The funding was led by SilverBlue, with participation by LeVert Ventures, Beta Milouot and PeakBridge. 

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