Poland has run its power grid on coal for as long as anyone can remember, and it’s about to bolt on the largest machine the country has ever built. Three American nuclear reactors, going up on the Baltic coast, each one assembled out of prefabricated steel modules the size of apartment buildings and craned into place by some of the biggest machines on tracks ever made.<\/p>\n
The reactors are Westinghouse AP1000s, three of them for a combined 3,750 megawatts, and the project just cleared the milestone that turns it from a forty-year talking point into an actual build. At the end of March, Poland’s state nuclear company filed the formal application to start construction.<\/p>\n
For a country that has talked about nuclear power since the Soviet era without ever pouring the concrete, that filing is the news. But the real story is the hardware, because an AP1000 isn’t so much poured on site as snapped together from giant chunks, and Poland is about to find out what that looks like up close.<\/p>\n
Each of Poland’s three units is a 1,250-megawatt pressurized water reactor, the latest Generation III+ design. What makes it interesting isn’t the reactor physics, which is well-trodden ground. It’s the way the thing gets built.<\/p>\n
Instead of pouring a plant in place from the ground up, Westinghouse breaks the AP1000 into enormous prefabricated modules. Wall and floor sections get welded together inside an on-site assembly building into structural blocks, and then one of the largest crawler cranes on Earth swings each block into position on the nuclear island.<\/p>\n
The biggest of them is a module called the CA20. At the Vogtle plant in Georgia<\/a>, it weighed around 840 tonnes and stood about 20 metres tall, the height of a five-story building, and it took a three-hour lift to set it down. It holds the spent-fuel storage, a heat exchanger and waste-collection gear, and once it’s in place, crews pour more than 1,800 cubic yards of concrete just to fill its walls.<\/p>\n The point of doing it this way is speed and quality control: build in a factory-like setting, lift the finished chunk, repeat. Westinghouse just locked Vogtle’s fourth reactor in as its standard reference design, which means Poland isn’t getting a prototype. It’s getting the de-bugged version of a machine that’s already running.<\/p>\n Strip an AP1000 down to its single most important part and you get the reactor pressure vessel: a thick steel can, the one that holds the nuclear fuel and the water around it for the 60-year life of the plant. The best ones are forged as a single seamless piece, because every weld is a spot you have to inspect for decades. Only a handful of forges on the planet<\/a> can make one that size, which is its own kind of bottleneck.<\/p>\n Getting a vessel that heavy into a reactor building is a brute-force job. Turkey just showed the version of this that makes for good video, lowering its first reactor vessel through an open roof at Akkuyu<\/a> and dropping the steel in from above before the dome went on. Poland’s reactors will go together on the same logic: set the containment vessel’s bottom head, swing in the big modules, stack the steel containment in rings, and cap the whole thing once the heavy lifts are done.<\/p>\n None of this is subtle. Building a nuclear reactor means some of the largest cranes ever assembled, steel pieces that weigh several hundred tonnes apiece, and for a while a deliberate hole left in the roof so you can drop the guts in from the sky.<\/p>\n The headline feature of the AP1000, the reason Westinghouse keeps winning these contracts, is that it’s designed to cool itself with no pumps and no operator stepping in.<\/p>\n The last module crews set on an AP1000 is a giant water tank that sits on top of the containment building. At Vogtle it weighed more than 325 tonnes and holds over three million litres of water. In an emergency, that water flows straight down by gravity to cool the reactor, no electricity required, and it can be redirected into the used-fuel pool or topped back up from elsewhere on site.<\/p>\n That’s the whole design philosophy in one tank: take away the pumps that can fail and the operators who can hesitate, and let physics do the cooling. Westinghouse also says the AP1000 has the smallest footprint per megawatt of any reactor on the market, which matters when you’re squeezing 3,750 megawatts onto one coastal site. This is the same machine Bechtel finished at Vogtle, the first new reactors switched on in the United States in more than three decades.<\/p>\n Poland is the coal heartland of the EU. Around 63% of its electricity came from hard coal and lignite in 2023, fed by domestic mines and by giants like the 5-gigawatt Be\u0142chat\u00f3w plant, one of the largest coal-fired stations in Europe. The country also sits on the bloc’s biggest coal reserves, which is great for energy independence and a headache for emissions targets at the same time.<\/p>\n Three reactors won’t replace all of that. But they’d hand Poland a block of carbon-free baseload power it has never had, and a way to start retiring coal without leaning entirely on imported gas or weather-dependent wind and solar. With Russia next door and energy security suddenly a front-page issue, a fixed domestic supply of electricity has its own pull beyond the climate math. Germany spent the last few years switching its reactors off; Poland is going the other way.<\/p>\n It isn’t Poland’s first run at this. In the 1980s the country started building a Soviet-designed plant at \u017barnowiec, also on the Pomeranian coast, before the project died in 1990 under the political and economic upheaval of the era and the long shadow of Chernobyl. The new build is Poland finishing an abandoned job, this time with American reactors instead of Soviet ones. And to be precise about the word “first”: Poland runs a research reactor called Maria, so it isn’t new to splitting atoms in a lab. It has just never made electricity from one.<\/p>\n The paperwork Poland filed on March 31 ran past 40,000 pages and took more than 200 specialists to assemble. It went to the national regulator, the PAA, which now has up to 24 months to rule on it, and PEJ still needs a separate building permit from the regional government in 2027. In May the regulator cleared an early checkpoint, finding the coastal site suitable<\/a> for a reactor.<\/p>\n The date that matters for the hardware is the fourth quarter of 2028. That’s when PEJ plans to pour “first nuclear concrete,” and in reactor bookkeeping that pour is the starting gun: it’s the moment a project officially counts as under construction, and the point where the heavy module lifts begin. It’s the same threshold Canada crossed this spring when it set the foundation for its first grid-scale small reactor<\/a>. From there, each Polish unit takes about seven years to build plus a year of testing, putting the first reactor online in 2036, then 2037 and 2038.<\/p>\n That’s the official timeline. The unofficial read is more cautious. The 2036 date is already a three-year slip from an earlier 2033 target, Poland’s own industry minister has floated 2040 as realistic, and one analyst at the consultancy Nuclear PL told the trade outlet NucNet the original goal was “quite unrealistic from the outset and wishful in nature.”<\/p>\n There’s also a contract that doesn’t exist yet. The big EPC agreement, the one that nails down who builds what and for how much, is still being negotiated; Westinghouse Poland’s president has said the once-floated mid-2026 deadline is no longer certain, putting it plainly that on a job this size “haste is a poor adviser.” What is moving is the slow, expensive stuff. Bechtel<\/a>, the EPC contractor, has roughly 300 specialists on the work, earthworks to level the site are underway, and PEJ has started ordering the long-lead components, the reactor pressure vessel among them, so the steel is in the pipeline before the concrete is poured. The plant will pull its cooling water straight from the Baltic Sea, skipping the giant cooling towers you might picture. The money is lined up too: roughly \u20ac14 billion of state equity covering about 30% of the cost, the rest in debt, with the European Commission’s sign-off in hand.<\/p>\n Poland has the partners, the permits in motion and most of the money. What it doesn’t have is a signed construction contract or a single pour of nuclear concrete.<\/p>\n The filing is real and the intent is serious. But the moment that turns a coal country into a nuclear one isn’t a signature on a permit. It’s the first 840-tonne module swinging off a crawler crane over the Baltic. That lift is still years out, on a schedule even the people building it won’t fully vouch for.<\/p>\n","protected":false},"excerpt":{"rendered":" Poland has run its power grid on coal for as long as anyone can remember, and it’s about to bolt … <\/p>\nHow you drop a reactor into a building<\/h2>\n
The reactor that cools itself<\/h2>\n
Why bolt a machine like this onto a coal grid<\/h2>\n
Where the build actually stands<\/h2>\n
The lift that counts<\/h2>\n