Natural draft cooling tower is preferred JEK2 option

Slovenia's JEK2 nuclear project has completed a feasibility study of cooling tower options and selected a natural draft design, standing between 193 and 198 metres tall. The study compared natural draft cooling, hybrid natural-mechanical systems, and mechanical cooling cells. The natural draft tower won on operating cost and electricity consumption: it requires no fans to move air, cutting both power draw and maintenance burden. A hybrid alternative with two shorter towers of 75 to 80 metres would cost more to run. A separate transport study examined eight routes from Slovenian ports to the reactor site at Krško, identifying a 274-kilometre road route via Ljubljana as most feasible, though it will require modifications at 112 locations for clearance and bridge work.

Where this fits

This is a reliability and cost story masquerading as a technical detail. The choice of cooling system directly shapes the plant's parasitic load, operating cost, and grid contribution. Natural draft cooling, the winner here, is the lowest-maintenance, lowest-electricity-consumption option available. For a country building firm dispatchable power to anchor an electricity system, every percentage point of self-consumption matters. The transport study, meanwhile, signals that even site-specific logistics for a single reactor are resolvable but non-trivial. Australia's renewable grid is being built on the promise that firm power isn't needed; Slovenia is building it because it is.

What it means

Australia has banned new nuclear generation despite holding world-class uranium reserves and facing a grid that cannot be firmed by weather alone without massive overbuild in transmission and storage. Slovenia is spending engineering effort on the physics and logistics of reliable power generation. The cooling tower choice matters because every joule of parasitic loss is a joule that must come from somewhere else on the grid, gas, battery, or more solar panels chasing the same unreliable wind and sun. That is the hidden cost of the renewable path: not just the panels and batteries, but the whole-system design work to compensate for what firm power does by default.