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European Energy Markets
15JUN

FR-DE power spread hits a weekly high

4 min read
12:23UTC

The France-Germany day-ahead power spread reached EUR 51.18 on 25 May, France clearing EUR 30.27 against Germany at EUR 81.45, on French nuclear surplus that carries a September expiry.

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Key takeaway

The long-France power trade is crowded, with the September Flamanville-3 overhaul as its dated unwind catalyst.

The France-Germany day-ahead power spread reached EUR 51.18 on 25 May, with France clearing EUR 30.27 against Germany at EUR 81.45, France up 73% on the day and Germany up 22% 1. That extends the EUR 46.58 baseline from 21 May while staying below the 28 April record of EUR 55.75 . German clearing above EUR 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.

Deep Analysis

In plain English

On 25 May 2026, France's wholesale electricity price was EUR 30.27 per megawatt-hour while Germany's was EUR 81.45, a gap of EUR 51.18. France and Germany are next-door neighbours, but that gap is comparable to buying petrol for EUR 1.00 in France and EUR 2.70 just across the border. That is roughly the same difference as buying petrol for EUR 1.00 per litre in France and EUR 2.70 per litre just across the border. France's price is low because EDF, the French state electricity company, runs a large fleet of nuclear power stations. Nuclear plants have very low running costs once built, so when they produce more electricity than France needs, prices fall sharply. France recently started up a new reactor called Flamanville-3 in Normandy, adding even more nuclear output. Germany's price is high because without nuclear and with limited renewable output at the moment, Germany burns gas to make electricity. Gas and carbon permits (which companies must buy when they burn fossil fuels) are expensive, so electricity from a German gas power plant costs a lot more to produce. The catch: from September, the new French reactor will go offline for a year of maintenance. That will reduce French surplus supply and probably narrow the gap between French and German prices, ending a trade that many investors have been profiting from.

Deep Analysis
Root Causes

Three structural factors maintain the EUR 51.18/MWh FR-DE spread in the 25 May print.

First, EDF's 350-370 TWh full-year nuclear guidance, supported by Flamanville-3's commercial declaration on 5 May, places France in persistent nuclear surplus during low-demand summer weeks. On days when French nuclear output exceeds domestic demand, the marginal clearing price falls to near-zero or to the next cheapest flexible plant in France, typically hydro or old gas peakers at EUR 25-35/MWh.

Second, Germany's gas-and-carbon marginal stack sets German day-ahead prices. With CCGTs running on TTF near EUR 47/MWh and EUA (European Emissions Allowances) at EUR 75/tonne CO2, the all-in marginal cost of a 55% efficient CCGT is approximately EUR 130-135/MWh.

Germany's day-ahead at EUR 81.45 on 25 May implies some CCGTs were in the merit order but not the price-setting plant, suggesting coal or lower-efficiency gas units set the 25 May price. As TTF rises, German clearing rises commensurately.

Third, the interconnection constraint between France and Germany prevents French nuclear surplus from equalising prices. The 3-4 GW of practical sustained interconnection capacity cannot bridge a 10-15 GW nuclear surplus gap on high-output days. The spread persists precisely because the physical wires cannot carry the arbitrage that price economics would imply.

What could happen next?
  • Consequence

    Flamanville-3's September overhaul removes 1.6 GW from French nuclear output at heating-season start, mechanically narrowing or reversing the FR-DE spread by reducing French surplus supply precisely when German gas-plant clearing prices rise with increased demand.

    Medium term · Assessed
  • Opportunity

    Long-FR, short-DE day-ahead positions remain profitable through August at current nuclear output levels. The September overhaul acts as a natural expiry for the trade, giving a three-month window during which the EUR 51.18 spread partially monetises.

    Short term · Assessed
  • Risk

    If Flamanville-3's September overhaul reveals additional maintenance requirements, the reactor may remain offline through winter 2026-27, reducing French nuclear output and tightening European power supply at the worst time.

    Medium term · Reported
Sources:euenergy.live (ENTSO-E sourced)·euenergy.live (ENTSO-E sourced)
Mentions:Bundesnetzagentur →France →Germany →EDF →Flamanville-3 →
First Reported In

Update #12 · EU refill doubles on mandates as TTF fades

euenergy.live (ENTSO-E sourced)· 26 May 2026
Read original →
Causes and effects
Caused by
FR-DE day-ahead spread doubles to EUR 46.58
The FR-DE spread widened further to EUR 51.18 on 25 May from the EUR 46.58 recorded on 21 May.
Occurred 21 May 2026
Read story →
France-Germany May power spread doubles record
The 28 April EUR 55.75 record is the structural ceiling; the 25 May EUR 51.18 is the cycle's second-highest print.
Occurred 28 Apr 2026
Read story →
Flamanville-3 commercial, 1.6 GW overhaul in September
The September Flamanville-3 overhaul removing 1.6 GW is the forward mechanism that will compress or reverse the FR-DE spread.
Occurred 5 May 2026
Read story →
Germany cannot inject at this price
Germany CCGTs remained off-merit in the 22 May storage print and continued to set the carbon-stack premium that drove EUR 81.45 on 25 May.
Occurred 22 May 2026
Read story →
May heatwave squeezes injection to 0.3 pp/day
May heatwave tests whether French nuclear export capacity can serve both domestic cooling load and cross-border German demand simultaneously, directly stressing the FR-DE spread.
Occurred 29 May 2026
Read story →
This Event
FR-DE power spread hits a weekly high
The crowded long-France trade has a dated reversal built into the calendar: the same EDF output suppressing French clearing drops 1.6 GW from September, just as winter demand builds.
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