Poland SMR cost estimate rises to 14 billion zlotys

What matters economically is not just the headline cost of one reactor, but the scale of capital Poland would have to mobilize to make SMRs a material part of its power mix. A single BWRX-300 unit would generate about 300 MW, enough for a large industrial site or a city such as Włocławek, but the project’s investment burden is heavy enough to require a policy framework that lowers revenue risk and appeases Brussels. Without a CfD or equivalent support, the private-sector case is likely to remain fragile.

That makes the Canadian reference project in Ontario crucial for investors and policymakers alike. Ontario Power Generation has permission to build the first of four BWRX-300s at Darlington under a 20.9 billion Canadian dollar program, with first power targeted for 2030. On a per-reactor basis, that implies about 14 billion zlotys, though analysts and academics caution that early build costs are often distorted by first-of-a-kind expenses and shared infrastructure. Prof. Grzegorz Liśkiewicz of Lodz University of Technology put the first reactor’s cost at 6.1 billion Canadian dollars, or about 16.7 billion zlotys, excluding common facilities.

For the market, the relevance is twofold. First, the figures suggest SMRs may not be a cheap shortcut around Poland’s larger nuclear plan in Choczewo, whose total investment cost has been estimated at around 192 billion zlotys for 3.75 GW. Kędzierski’s comparison implies roughly 44 billion zlotys per GW for the SMR fleet versus about 51 billion zlotys per GW for the large plant, narrowing the cost advantage that proponents often cite. Second, the timeline remains long. Even if the Polish project stays on track, first operation before 2035 looks unlikely, despite OSGE’s earlier ambition for a 2032 start.

That delay matters because the economics of first-unit nuclear projects usually improve only after the technology, supply chain and regulatory model have been proven. The bull case is that once BWRX-300 is standardized, later units should be cheaper, faster and easier to finance, especially if they are clustered near industrial users such as Anwil in Włocławek, chemical facilities at Stawy Monowskie and the special economic zone in Stalowa Wola. The bear case is that cost overruns and schedule slips, already a hallmark of large nuclear projects such as Britain’s Hinkley Point C, erase the benefits of scale and leave Poland with expensive low-carbon power that still needs state guarantees.

Investors will watch whether Warsaw approves a support mechanism acceptable to the European Commission, because that will determine whether SMRs become bankable infrastructure or remain a strategic concept on paper. The answer will shape not only Orlen, Synthos and ZE PAK’s plans, but also the broader investment case for Poland’s industrial decarbonization and electricity security.