Cattenom Hits Its 40-Year Inspection — and Luxembourg's Pressure Campaign Resumes

Luxembourg's most consequential energy story does not happen on Luxembourg territory. It happens 12 km across the border, on the French side of the Moselle, at Cattenom — a four-reactor 1300 MW pressurised-water nuclear plant that began operating between 1986 and 1991. Whether and how those reactors keep running into the 2030s is back on the political agenda in 2026.

The clock

Cattenom's reactors were originally designed for a 40-year operating life, which would bring them to scheduled shutdown between 2026 and 2031. Operator EDF has launched a procedure to extend their lifespan until at least 2035, in line with the broader French nuclear strategy of squeezing more years out of the existing fleet while EPR2 reactors are built elsewhere.

That procedure runs through the fourth ten-yearly inspection, the safety review that determines whether each reactor can keep operating beyond 40 years. Reactor 1's review is scheduled for 2026 — the trigger event that has reactivated cross-border political attention.

Luxembourg's position

The Luxembourg government's position is unambiguous: Cattenom should close, not be extended. That stance has been backed by joint statements with Saarland and Rhineland-Palatinate, the German neighbours immediately downwind of the plant. The arguments combine seismic and ageing concerns with the real-world track record: in 2025, two reactors at Cattenom were taken off-grid for corrosion checks after similar issues at other French plants of the same generation.

Luxembourg has also pushed for stronger transparency and cross-border information sharing in case of incidents. The country has consistently argued that proximity to a nuclear site without operational say is itself a structural problem in the European nuclear governance framework.

What's not happening

Despite recurring rumours, Luxembourg has confirmed it has received no formal notification of a new EPR2 reactor at Cattenom. France's draft 2025–2035 energy programme does not list Cattenom among the sites for new construction, focusing instead on Penly, Gravelines and Bugey.

Why the politics will matter more in 2026

Even with no new build, the lifespan-extension decision is the bigger fight. A favourable safety review for reactor 1 sets a path for the other three reactors and locks in another decade of operation directly upwind of Luxembourg's drinking-water catchments and most populous cities. With EU energy security back at the top of the agenda, France's argument for keeping the existing fleet running is hard to counter — and Luxembourg's leverage, as a neighbour without a vote, remains primarily diplomatic.

2026 is the year that diplomacy gets tested.