Why Isn’t Sri Lanka Going Nuclear? I Went Looking for the Answer
Nuclear energy is one of the cleanest, most reliable power sources on the planet. So why does a country that suffers through drought-driven blackouts, pays through the nose for imported oil, and has committed to carbon neutrality by 2030 and net zero by 2050 [1][2][3] keep treating it like a distant fantasy?
I had that exact question in my head when I visited the Sri Lanka Atomic Energy Board (SLAEB) in Colombo. Walking past reactor simulators, International Atomic Energy Agency (IAEA) mission reports stacked on shelves, and staff who have spent years quietly building the groundwork for something the country hasn’t officially decided to do yet, I remember thinking: Is this serious, or is it another plan that sounds good in a conference room?
Conversations with Prof. S. R. D. Rosa, former Chairman of SLAEB, had already given me the sense that Sri Lanka’s nuclear preparations are far more serious than public discourse suggests. A lot of quiet, technical work has been happening over the years, well away from headlines. That curiosity stayed with me. So I went looking for a fuller picture.
I left with more questions than answers from that visit. So I kept digging.
A Reality Check from Someone Who Knows the Grid
I got the chance to have a talk with Eng. Dr. Tilak Siyambalapitiya, former Chairman of the Ceylon Electricity Board (CEB). I came in with the somewhat naive assumption that nuclear’s benefits were obvious and the hesitation was mostly political. He walked me out of that assumption fairly quickly.
Sri Lanka runs an isolated grid, not connected to any neighbouring country. As more solar and wind come online, the share of generation from inverter-based sources grows. These sources do not contribute to what engineers call synchronous inertia, the physical property of large rotating machines that helps a grid absorb sudden shocks and recover when something trips. The coal plants at Norochcholai, whatever one thinks of coal, currently provide that stabilizing mass. As they are phased out, that inertia disappears, and the grid becomes progressively more sensitive to disturbances.
Dropping a large, inflexible nuclear plant into a small, inertia-poor grid without the surrounding infrastructure to support it does not make the system more stable. It makes it harder to manage. The grid has to be ready first.
That framing shifted how I thought about the whole question. It is not “should Sri Lanka go nuclear” in the abstract. It is “Can Sri Lanka’s grid be made ready for nuclear, and by when?”
The Problem the Grid Is Actually Heading Toward
To understand why nuclear keeps coming up, you have to understand what Sri Lanka’s grid is heading toward.
In 2025, renewables accounted for 62% of electricity generation, with solar now the largest single installed capacity at over 2,500 megawatts (MW). That sounds like progress, and it is. But a significant portion of that renewable share came from hydropower, which swings heavily with rainfall. Drought years in 2012, 2016, 2017, and 2019 all caused serious shortfalls. There is currently no grid-scale battery storage or pumped hydro storage in operation. Thermal plants run on imported oil and coal, and the 2022 energy crisis showed how quickly that dependence can become a crisis when foreign exchange runs out.
The government’s energy policy sets three targets: 70% renewable energy by 2030, carbon neutrality in power generation by 2050, and no new coal plants. Coal currently provides the only reliable, always-available baseload power Sri Lanka has. Those coal plants are scheduled to retire around 2041 at the end of their operating lives. When they go, a real gap opens in the generation mix, one that solar and wind cannot fill around the clock on their own.
That gap is where the nuclear conversation becomes unavoidable.
What the Planning Work Shows
Sri Lanka’s Long-Term Generation Expansion Plan 2025–2044 (LTGEP), recently approved by the Public Utilities Commission of Sri Lanka (PUCSL), includes a 600 MW nuclear plant around 2044 in the base case for the first time. Not a scenario. Not an asterisk. The base case.
The timing addresses the grid stability concern directly. A nuclear plant cannot be accommodated on today’s grid out of thin air suddenly. But by 2040, the picture is different. Demand will have grown. Battery storage, synchronous condensers, and pumped hydro storage will have been added, hopefully! A proposed High Voltage Direct Current (HVDC) interconnection with India, targeted for around 2039, provides additional grid support. In that rebuilt grid, a 400–600 MW nuclear unit becomes technically viable, and it fills the clean baseload gap that nothing else adequately fills.
So what kind of reactor are we actually talking about?
The recommended reactor type for Sri Lanka is 300–400 megawatts electrical (MWe), either Small Modular Reactors (SMRs) or Generation 3+ designs, with two to three units on a single site. SMRs were specifically designed for smaller grids and phased deployment.
Now, the honest question on everyone’s mind: What does it actually cost?
Nuclear has high upfront capital, around USD 6,300 per kilowatt for a 600 MW plant. But the cost picture changes when you look at it over time. The CEB’s own screening curve analysis shows that at plant factors above 70–80%, nuclear’s specific cost per unit of electricity drops below coal and converges with combined cycle gas.
For a real-world reference, a comparable plant in the region has a projected unit cost of around LKR 12–21 per kWh, depending on the discount rate assumed, at today’s exchange rates. That is not cheap electricity. But it is electricity that does not depend on global fuel markets, does not emit carbon, and runs for 60 years.
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The catch is financing. Unlike a gas turbine that a commercial bank will comfortably back with a 5–7 year payback expectation, a nuclear plant’s debt repayment stretches far longer before revenue catches up. Sri Lanka would need a combination of vendor financing and development bank support to make the numbers work.
The construction timeline itself adds to that lead time. A large plant takes 8–12 years from site selection to commissioning. An SMR class plant is somewhat shorter at 8–10 years. Either way, decisions made today determine whether a plant is online by 2035 or 2040.
The path to carbon neutrality essentially requires a source like this. With coal gone and storage limited, there are very few low-carbon, dispatchable alternatives at the scale Sri Lanka will need.
Where Sri Lanka Actually Stands
The IAEA has a structured three-phase process for countries introducing nuclear power, moving from Consider to Prepare to Construct, with a formal decision milestone at each stage. Sri Lanka is at the end of Phase 1, which sounds modest until you see what Phase 1 actually involved.
Part of that Phase 1 work involved identifying where a plant could physically go. Five candidate sites for a nuclear installation have been identified after surveying 27 potential locations across four coastal regions, with seismic, geological, tsunami, and meteorological data all evaluated. The 2004 tsunami zone was explicitly factored in.
This was not desk research. Field teams conducted drone surveys, PQWT geophysical measurements, and elevation profiling at candidate locations, with IAEA experts present during the 2024 Site and External Event Design (SEED) Mission.
Site selection was one track. Running in parallel, the legal and institutional foundation was being built. A new Atomic Energy Act covering nuclear safety, security, safeguards, and civil liability has been drafted and reviewed by the IAEA’s Office of Legal Affairs. It is close to finalization. An IAEA review mission in July 2025 found Sri Lanka had fully completed 9 of 26 earlier recommendations, with no items marked “not implemented” [4].
The Asian Development Bank (ADB) and World Bank have both recently lifted long-standing bans on financing nuclear projects, opening a door to development financing that was previously closed.
The one thing that has not happened is the formal government decision to proceed, flowing through parliament, cabinet, and the President. That decision is what converts years of technical preparation into an authorized program with a real timeline and real funding. It has not been made. yet!
So, Is It Feasible?
The technical case is real. The baseload gap is coming, and it is structural, not temporary. Nuclear is one of the very few low-carbon, always-available options at the scale Sri Lanka will need. The sites have been identified. The institutional groundwork is further along than most people realize. The financing environment has shifted in nuclear’s favour.
There is, however, an economic condition worth being honest about. A nuclear power plant delivers its full value in an economy with consistently high electricity demand, the kind that comes from metro rail systems, electric vehicle industries, industrial zones, and round-the-clock commercial activity. Sri Lanka’s current electricity demand is not yet at a level where nuclear power becomes straightforwardly economically viable. For a nuclear plant running at a high capacity factor to be truly economically justified, that demand profile needs to grow and flatten out. The 2044 timeline is not just about grid readiness. It is also about whether Sri Lanka’s economy and electricity demand will have grown enough by then to make the investment genuinely worthwhile.
There is also the question of investment scale. A 600 MW nuclear plant would cost in the region of USD 3.5 to 4 billion, more than twice what Norochcholai cost, which was itself Sri Lanka’s largest ever infrastructure investment. For an economy of Sri Lanka’s current size, this is genuinely uncharted territory. And unlike coal, oil, or solar panels, nuclear is not a commodity you can shop for on an open market. Fuel supply and spent fuel management require a long-term relationship with one of a small number of countries that control the nuclear industry. That is not a reason to say no. But it is a reason to go in with clear eyes about what the commitment actually entails.
Unlike a road or a power substation, a nuclear program cannot be started by one government, suspended by the next, and restarted by the one after. The legal frameworks, institutional structures, and international agreements that underpin it require a continuity of commitment that transcends election cycles. This is not a project a country dips its toes into. Once the decision is made, it has to be made for keeps. The Philippines began construction of a nuclear plant in the mid-1970s, stopped it halfway through, and is still counting the financial losses decades later. And while the probability of a Fukushima-scale disaster is very small, the cleanup cost is not. Early estimates put it at USD 25 billion, with more recent figures reaching as high as USD 160 billion [5]. Sri Lanka in 2022 fell to its knees, unable to service external debts of USD 51 billion. The risk of a catastrophic event is low. But for an economy of Sri Lanka’s size, it cannot be dismissed as negligible.
But being honest about feasibility also means being honest about what still stands between here and a commissioned plant. The challenges are not just political. Human resource development for a nuclear program runs deep: Sri Lanka needs not just nuclear engineers but quality assurance professionals, regulatory experts, nuclear lawyers, and trained operators, a workforce that takes years to build. A suitable vendor has to be selected, which involves technical, financial, and geopolitical considerations. Funding and financing structures need to be established, and as the payback period chart makes clear, this is not a project commercial banks will queue up to finance. And public acceptance cannot be assumed: Fukushima and Chernobyl still shape public perception, and a credible nuclear program requires sustained, honest public engagement.
The government decision is the gateway. But the real work begins after it.
Sri Lanka has studied this question carefully for nearly a decade in the current cycle. The answer to why it isn’t going nuclear yet is not fear, not ignorance, and not lack of preparation. It is that the country is standing at a decision point where the technical groundwork is largely done, but the financial, institutional, human capital, and political pieces all need to come together at the same time.
None of that is impossible. Sri Lanka is not starting from zero. Nearly a decade of groundwork, international engagement, and institutional development has already been done. The preparation is real. The expertise exists within the country. The international frameworks are in place. Sri Lanka has already received expressions of interest from several countries with established nuclear industries, which means the vendor question is not a blank page. What remains is the political will to make a decision that will outlast any single government, and the institutional discipline to see it through.
That is a hard thing to do. But the window is open. For now.
Acknowledgement
This article was informed by the Institution of Engineers, Sri Lanka (IESL) Civil Engineering Sectional Committee (CESC) Webinar “Can Nuclear Energy Solve Sri Lanka’s Power Crisis: Myth vs Reality,” held on April 22, 2026. Sincere thanks to the presenters: Mr. Malinda Ranaweera, Assistant Director and Head of the Project Management Unit at the Sri Lanka Atomic Energy Board; Eng. Eranga Jayarathna, Chief Engineer, Generation Planning at the National System Operator (Pvt) Ltd; and Ms. Kseniia Elkina, Nuclear Engineer, Rosatom, Mumbai, for their informative presentations at the webinar. I would also like to extend my appreciation to the Institution of Engineers, Sri Lanka Civil Engineering Sectional Committee, including its Chairman, Eng. Sandun Madhushanka and the organizing committee, for facilitating the webinar.
This article was reviewed prior to publication by Prof. S. R. D. Rosa, former Chairman of the Sri Lanka Atomic Energy Board; Eng. Dr. Tilak Siyambalapitiya, former Chairman of the Ceylon Electricity Board; Mr. Malinda Ranaweera; and Eng. Eranga Jayarathna, whose expert review and feedback were invaluable in ensuring the accuracy and balance of this piece.
Special thanks to Prof. S. R. D. Rosa and Eng. Dr. Tilak Siyambalapitiya for their valuable insights and discussions that helped shape the thinking behind this article. Thanks are also due to Eng. Tharaka Siyambalapitiya, Senior Project Engineer at RMA Energy and Visiting Lecturer at the Department of Electrical Engineering, University of Moratuwa; Eng. Wathmi Ruwanya, Electrical Engineer at KNSI Aviation Engineering Pvt Ltd; Mr. Prabhath Jayasinghe, Graduate Trainee at the Sri Lanka Atomic Energy Board; Ms. P.L.Kavindya Perera, Undergraduate Trainee at the Sri Lanka Atomic Energy Board; and Dr. Chathurie Nupearachchi, Founder and Chief Executive Officer of Digimeet Education, for their time and feedback.
References
[1] Cabinet of Ministers, Sri Lanka, Decision of 27 November 2023: Carbon Net Zero 2050 Roadmap and Strategic Plan: https://www.cabinetoffice.gov.lk/cab/index.php?option=com_content&view=article&id=16&Itemid=49&lang=en&dID=12273
[2] Ministry of Environment, Sri Lanka, Carbon Net Zero 2050 Roadmap and Strategic Plan — Synthesis Report, November 2023: https://env.gov.lk/web/images/pdf/divisions/climate_change_division/publications/2023/Synthesis_Report_for_Carbon_Net_Zero_2050__Roadmap_and_Strategic_Plan.pdf
[3] Ministry of Environment, Sri Lanka, Carbon Net Zero 2050 Roadmap and Strategic Plan — Full Report, August 2023: https://www.climatechange.lk/CarbonNetZero2050.pdf
[4] IAEA, Integrated Nuclear Infrastructure Review (INIR) Follow-up Mission Report, Sri Lanka, Phase 1, January 2026: https://www.iaea.org/sites/default/files/2026-01/inir-srilanka-phase-1-follow-up.pdf
[5] BBC News, “Fukushima clean-up: The true cost,” December 2016: https://www.bbc.com/news/world-asia-38131248
