London — French nuclear operator EDF has delayed the planned return dates of four reactors -- Flamanville 1, Penly 1, Belleville 1 and Tricastin 3 -- by a combined 11 days deeper into January, it said Wednesday morning.
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The fresh delays are expected to cut planned nuclear output by up to 0.3 TWh over coming days, calculations by S&P Global Platts show.
However, this has already been partially offset by EDF on December 28, delaying planned maintenance works at the 1.3 GW Flamanville 2 reactor, now only expected to start January 10.
This year will be heavily impacted by a number of extended maintenance stops at French reactors with seven units having to undergo 10-year reviews, adding uncertainty to scheduled return dates.
As an example, the Flamanville 1 return from its 10-year-review that started in April 2018 -- initially scheduled for five months -- is already delayed by over four months.
The unit is now scheduled to return to service next Monday, EDF said in its latest update Wednesday.
French grid operator RTE, in its winter outlook, warned of tight nuclear supply with a period from mid-January to end-February most at risk if coinciding with colder temperatures boosting power demand.
Temperatures are forecast to dip below seasonal norms over coming days with RTE pegging peak demand above 85 GW early next week, its latest forecast shows.
Nuclear output on Wednesday morning peaked at 56 GW out of a total installed 63.2 GW nuclear capacity, RTE data showed.
TABLE: French Reactor Watchlist
|Delayed 2018 Maintenance||MW||Offline since||Scheduled Return||Comment|
|2019 Maintenance Schedule||Offline from||Scheduled Return|
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