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Scanning European outage signalsOf 35 distinct nuclear units with outages disclosed across Europe in the past 14 days, 31 sit in France — 88.6% of the entire book, more than the next three countries combined. The largest single unavailability is a 1,500 MW French reactor (CHOOZ B 1) flagged offline through 23 June.
Data source notice: This analysis is based on publicly available ENTSO-E Transparency Platform data. Latency patterns described here are observations from public disclosure records and do not constitute regulatory findings or determinations of wrongdoing.
France owns 31 of the 35 distinct nuclear units carrying disclosed outages across Europe over the past 14 days — 88.6% of the entire book, more than the next three countries combined, and 20.7 times the four-country median of 1.5 units. The single largest unavailability is a 1,500 MW French reactor, CHOOZ B 1, flagged offline from 12 June through 23 June.
The disclosed nuclear-outage book over the past 14 days is not a European event spread across zones. It is a French one. France carries 31 of the 35 distinct units with outages in the window. Spain follows with 2; Hungary and Sweden contribute 1 each. France alone tops the combined total of every other country with a disclosed nuclear outage in the period, running 20.7x the four-country median of 1.5 units.
The 88.6% share is the headline, and it frames everything that follows. The question is not why Europe's reactors are down, but why one zone dominates the disclosure book this completely.
The largest single unavailability in the window is the French unit CHOOZ B 1, rated 1,500 MW and operated by RTE. Published on 01 June, it runs offline from 12 June through 23 June, sitting at the top of the table of largest nuclear outages disclosed in the past 14 days, ranked by affected MW.
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The concentration runs through the entire upper band: French units take 7 of the top 7 rows by affected megawatts. The largest non-French entries surface only further down. For a trader pricing the French stack, the marginal-capacity question is answered almost entirely by reading French unit-level disclosures.
The 88.6% figure has two drivers, and separating them matters. France operates Europe's largest reactor fleet, so a higher absolute count of units carrying outages at any moment is structural. The dominance in the disclosure book is amplified by how RTE publishes: dense, revision-heavy production-unavailability messages on a per-unit basis. The CHOOZ B 1 profile alone shows 14-plus distinct temporal windows and 18-plus separate claims as the expected return is revised and the available capacity is restepped.
Walk the chain. Fleet size combines with granular RTE disclosure, so each unit generates a stream of unit-level messages rather than a single zonal summary. Both the physical unavailability and the disclosure traffic concentrate in one zone, producing the 31-of-35 count and the 88.6% share. The book therefore reads as a French nuclear availability signal — one that traders pricing FR day-ahead and FR-border spreads track unit by unit — rather than evidence of a Europe-wide reactor crisis.
That distinction governs how every superlative here reads. "31 of 35" and "more than the next three combined" are scoped to the four countries with any nuclear outage disclosed in the window. They describe the shape of the disclosed book, not the operational state of every reactor on the continent. A zone that publishes one consolidated message per outage event will register fewer distinct entries than one publishing a revision stream per unit, regardless of underlying physical availability.
The book is not a June-only phenomenon. Several French units carry end-dates well beyond the 14-day window, signalling sustained capacity off the French stack into the high-demand season. One 1,045 MW unit runs to 02 August. One 620 MW unit carries an end-date of 07 December. One 390 MW unit runs to 24 November.
These long-dated entries reshape the headline. The 1,500 MW CHOOZ B 1 outage clears on 23 June, but the tail of the book extends through summer and into the fourth quarter. The withdrawal of French capacity, as disclosed, layers across return dates rather than concentrating on a single clearing point. For the French stack, the variable that matters is the cadence of returns against those staggered end-dates, not a single binary on/off date.
Track whether the French nuclear outage count clears as the largest units return — specifically whether the 1,500 MW CHOOZ B 1 unit comes back on its 23 June end-date, and what its revision stream shows in the days before. Watch whether the French concentration share falls below the 88.6% mark as units in other zones enter the book, or holds as RTE's per-unit disclosure cadence keeps dominating the count.
The signal that matters for positioning is the per-unit return cadence measured against the July-to-December end-dates already on the book. For an analyst or trader pricing FR day-ahead and FR-border spreads, this is a French availability read to work unit by unit — the 1,045 MW unit to 02 August, the 620 MW unit to 07 December, the 390 MW unit to 24 November — not a Europe-wide reactor story to price across zones. Confirm each return against its disclosed end-date before treating the capacity as restored to the stack.