The France-Germany day-ahead power spread reached €51.18 on 25 May, with France clearing €30.27 against Germany at €81.45, France up 73% on the day and Germany up 22% 1. That extends the €46.58 baseline from 21 May while staying below the 28 April record of €55.75 . German clearing above €80 keeps the carbon and coal stack marginal and leaves CCGTs off-merit .
French nuclear surplus is the single physical buffer suppressing Continental clearing, and it is the buffer with a calendar limit. EDF holds 350-370 TWh full-year guidance and declared Flamanville-3 commercial on 5 May, but the reactor enters a major overhaul from September that removes 1.6 GW at the onset of the heating season .
That expiry is the non-obvious mechanism behind a spread the desk already knows. The long-France, short-Germany day-ahead position is crowded, and the trade is not unwound by a structural break in the carbon stack but by a dated maintenance event: the same nuclear output that holds France cheap all year contracts in September, mechanically narrowing or reversing the gap exactly as demand turns up. The crowd is leaning into a spread whose reversal catalyst is already on the calendar, which makes the September overhaul the hinge to position around rather than the daily print.
