Update — 12 November 2026, 17:06 UTC: A later Nuclearelectrica filing dated 11 November revised Cernavodă Unit 1’s expected grid reconnection to 13 November and nominal power to 14 November. These are targets, not confirmation of a restart.
The operator said additional time was needed to finish remedial work. It said the work followed nuclear-safety procedures, without impact on personnel or the environment. This later filing supersedes the 12 November reconnection target quoted in our earlier update below.
Source: Nuclearelectrica’s revised restart filing, 11 November 2026.
Earlier update: Unit 2 reconnection confirmed
Update — 12 November 2026, 12:14 UTC: Nuclearelectrica confirmed in its 11 November statement that Cernavodă Unit 2 reconnected to Romania’s national grid that day. Its expected return to nominal power on 12 November remains a forecast in that statement, rather than confirmation of full output.
The same statement scheduled Unit 1’s reconnection for 12 November after remedial work, followed by nominal power on 13 November. This update does not confirm that Unit 1 has reconnected. The operator said the work and reconnection procedures followed nuclear-safety requirements, without impact on personnel or the environment.
Source: Nuclearelectrica statement, 11 November 2026.
Earlier updates
Update — 11 November 2026, 05:26 UTC: Nuclearelectrica’s subsequent reports confirm that Cernavodă Unit 1 disconnected again on the evening of 9 November, following a malfunction in its conventional, non-nuclear section. The operator says the disconnection followed operating procedures and had no impact on nuclear safety.
In its 10 November report, Nuclearelectrica estimated two to four days for Unit 1 remedial work, followed by synchronisation and restart procedures. The estimate is not a confirmed return-to-service date; a detailed root cause was not established in the reports reviewed.
The operator revised Unit 2’s planned grid synchronisation to 11 November, with nominal power expected on 12 November. These remain scheduled milestones in that report. This update does not confirm that Unit 2 has synchronised or reached full output.
Sources: operator’s 9 November disconnection report · 10 November restart and repair update.
Earlier report: Unit 1 returned on 6 November
Nuclearelectrica has confirmed that Unit 1 at Romania’s Cernavodă nuclear power station reconnected to the national electricity grid on the afternoon of Friday, 6 November 2026.
The operator’s dated stock-exchange report confirms completion of the synchronisation planned in its 4 November announcement. It says the reconnection procedures had no impact on nuclear safety, personnel or the public. The statement does not specify the unit’s subsequent output.
In its earlier announcement, the company explained that Unit 1’s cooling-water demand would lower the intake-basin level. It said Unit 2’s restart would depend on a sustained rise in the Danube. The 6 November report confirms Unit 1’s return only; it does not establish that both reactors are back online.
Source: Nuclearelectrica report, 6 November · Operator’s 4 November update.
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File photograph: Cernavodă Nuclear Power Plant, Romania, 13 April 2026; not the November restart. Petr Štefek / Wikimedia Commons, CC BY-SA 3.0 Czech Republic. Resized and compressed; same licence retained. Individual reactor units are not identified in the photograph.
By Energy People. Compiled with AI assistance from linked sources.
