Greece’s mainland grid now exports surplus solar electricity to neighboring countries — a milestone few would have predicted a decade ago. Yet dozens of Aegean islands still run on diesel generators, entirely dependent on fuel shipped in by tanker. The clean-energy revolution has reached the continent while leaving much of the archipelago behind.
A new study suggests an unconventional fix may now be within reach — one that’s entering serious policy discussion for the first time.
An archipelago left behind by the green transition
Greece’s renewable energy transformation has been striking by almost any measure. Solar investment surged across the mainland, and by 2024, the national grid had crossed a significant threshold — becoming a net electricity exporter. On the sunniest days, the country generates more power than it can use, resulting in high curtailment rates where excess energy goes to waste rather than reaching consumers who need it.
The irony is hard to miss. While the mainland manages surplus power, non-interconnected islands in the Cyclades and Dodecanese remain entirely dependent on diesel-fired generating stations. Every kilowatt-hour those communities consume requires imported fuel, shipped by tanker and burned on-site. Renewables haven’t solved this — intermittency and the cost of grid interconnection have kept diesel firmly in place.
This gap between mainland abundance and island scarcity is exactly the problem the new study sets out to address.
What a floating nuclear power plant actually is
The technology at the center of the study isn’t speculative. Floating nuclear power plants are small modular reactors mounted on barges, engineered to be towed to coastal locations and moored near the communities or facilities they serve. No large footprint is required, and the civil infrastructure demands are a fraction of what a conventional plant would need.
Their scale is part of the appeal. Sized to meet small or variable demand, they match island load profiles far better than traditional baseload generation. Because they’re mobile, they can be repositioned as energy needs shift — something no land-based power infrastructure can offer. The study’s authors characterize the technology as mature: according to the Deon Policy Institute and its co-authors, no remaining technical hurdles stand between the current state of the technology and real-world deployment.
Why Greece is a strong candidate for this technology
Greece’s geography makes it an unusually good fit. A coastal state with hundreds of inhabited islands, it can install generating capacity close to areas of high demand without requiring extensive new grid infrastructure — which is precisely why interconnecting remote islands by undersea cable has proven so costly and slow.
The study identifies several concrete use cases beyond replacing diesel generators: electrifying seaports, supplying data centers with dedicated and reliable power, or providing grid-independent capacity where conventional connections aren’t feasible. There’s also an industrial argument. Greece’s established maritime sector — its shipyards, engineering firms, and operational expertise — provides a relevant foundation for constructing and running floating nuclear installations, lowering the barrier to entry compared with countries starting from scratch.
The study itself reflects a cross-sector coalition, conducted jointly by the Deon Policy Institute, classification society ABS, nuclear energy company Core Power, and Greek energy firm Athlos Energy.
The real obstacles: regulation and public trust
If the technology is ready, what’s holding deployment back? The study is direct on this point: the bottleneck isn’t engineering — it’s governance and public perception.
Before a floating nuclear plant could operate in Greek waters, nuclear power would need to be formally integrated into Greece’s national energy plans. That’s a policy decision, not a technical one, and it requires political will sustained over a planning horizon of more than a decade. Safety oversight structures, licensing procedures, and maritime coordination protocols would all need development or adaptation — not insurmountable, but they take time and institutional investment to build properly.
Public acceptance is the remaining piece. Nuclear power carries historical baggage across much of Europe, and Greece is no exception. Patrick Ryan, ABS Senior Vice President and Chief Technology Officer, addressed this directly ahead of the Posidonia 2025 conference in Athens: “The real challenge before us is integration into policy and regulatory frameworks, and ABS is committed to helping the industry navigate that path.”
A 2035 target — and what it would take to get there
The study’s authors estimate that a floating nuclear power plant could be operational in Greece somewhere between 2035 and 2040. That timeline is tight but not unrealistic — provided the non-technical work begins now.
What success requires, the authors are explicit about: political momentum must be converted into lasting institutional commitment. Regulatory preparedness and public acceptance need to develop in parallel, not sequentially. Working through those fronts one after the other would push the timeline well beyond 2040.
The study positions its findings as a foundation for broader industry deployment discussions, not a final blueprint. What happens next in Athens — at Posidonia and in the policy conversations surrounding it — may offer an early signal of whether Greece is prepared to move from analysis to action. The diesel generators on those Aegean islands are still running. Whether they’re still running in 2035 may depend on decisions made in the next few years.
Carlos is an engineer with strong expertise in technical and industrial topics. He previously worked at international companies such as Siemens and speaks Spanish, German, English, and Italian.
