13SEP

France holds cheaper leg, heat unwinds

2 min read

13:27UTC

The France-Germany day-ahead spread compressed about 70% from its 30 June heatwave peak of EUR 71.50 to around EUR 18-26 by 5 July, as German prices nearly halved and France held the cheaper leg.

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Key takeaway

France held the cheaper day-ahead leg as the heat premium unwound, with Flamanville-3's September overhaul the forward risk.

The France-Germany day-ahead power spread compressed roughly 70% from its 30 June heatwave peak of EUR 71.50/MWh to around EUR 18-26/MWh by 4-5 July, as the heat broke and both legs fell ¹. German day-ahead means dropped to roughly EUR 62-64/MWh from EUR 195 on 30 June, nearly halving.

France held the cheaper leg throughout the window, consistent with the 22 June reset where EDF nuclear kept French clearing below Germany . France last traded as the dearer leg on 15 June , a brief inversion that has not returned.

Germany's thermal stack drove the premium: gas-and-carbon CCGT set a high day-ahead floor through peak cooling demand, and that floor unwound as temperatures fell, compressing the clean spark spread with it.

The forward risk sits in September, when Flamanville-3 enters a year-long overhaul and removes roughly 1.6 GW from EDF's fleet at the onset of the heating season. Whether France holds the cheaper leg through it, or German thermal reclaims the discount, is the trade this desk watches.

Deep Analysis

In plain English

Electricity got much cheaper in Germany over the past week, falling from EUR 195 per megawatt-hour on 30 June to around EUR 62-64 by early July, as a heatwave-driven price spike unwound. France's prices stayed lower than Germany's throughout, as they usually do, because France's large nuclear fleet keeps its electricity cheap. The gap between the two countries' prices, which had widened to EUR 71.50 during the heatwave, shrank back to about EUR 18-26. This is largely weather returning to normal: less need for gas-fired power plants in Germany once wind picked back up, and France's nuclear stations kept running through the heat despite some output cuts.

Deep Analysis

Root Causes

Germany's day-ahead price is set by its gas-and-carbon thermal stack whenever wind output is low, so the clean spark spread, the margin a CCGT operator earns after paying for gas and carbon, widened to roughly EUR 74/MWh at the 30 June peak and has now compressed as wind returned and gas-fired units stopped setting the marginal price.

France's cheaper leg depends on nuclear baseload staying online regardless of river temperature. EDF's 12% output cut on 30 June removed volume from Bugey, Golfech and Nogent without touching the low-cost baseload that actually sets the French clearing price, which is why the curtailment dented supply but did not flip France to the dearer leg.

What could happen next?

Risk
Flamanville-3's scheduled overhaul from September removes 1,650 MW of French nuclear baseload through most of the 2026-27 winter, narrowing France's margin if another heatwave-driven curtailment event coincides with low wind.
Medium term · Assessed
Meaning
The spread compression back to EUR 18-26 is a return to the pre-heatwave baseline rather than evidence of a new structural low, since it depends on EDF's nuclear fleet running without further curtailment.
Immediate · Assessed
Precedent
The 15 June polarity flip shows France's cheaper-leg status can reverse within days once French forward contracts reprice on curtailment risk, a pattern Flamanville-3's outage could make more likely to recur.
Short term · Reported

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: The 15 June polarity flip, when France briefly cleared roughly EUR 1.6/MWh above Germany, shows the France-cheaper regime is not automatic; it reversed once French forward contracts repriced on cooling-water curtailment risk, the same mechanism now being tested again ahead of Flamanville-3's outage .

Counter-parallel: The 3 June heatwave, when a solar surge collapsed French day-ahead to EUR 8.96/MWh against Germany's EUR 102.64, shows the opposite risk resolving cleanly within a single day once weather shifted, suggesting France's cheaper-leg status can snap back fast even after a curtailment scare.

Germany's day-ahead price nearly halved mechanically, from EUR 195 to EUR 62-64/MWh, as wind generation recovered and gas-and-carbon units left the margin, collapsing the clean spark spread from its EUR 74 peak back toward levels last seen before the heat series began.

The EUR 18-26 spread by 4-5 July is a return to the pre-heatwave baseline rather than a new low, and it holds only as long as EDF's nuclear fleet runs without further river-temperature curtailment. Flamanville-3's September overhaul removes 1,650 MW of that baseload for a year, tightening the margin the next time a heat-and-low-wind event coincides.

Consensus view: RTE's summer adequacy planning treats the heatwave spread as a weather event, not a structural shift, since the EUR 71.50 peak on 30 June came from a wind drought colliding with river-cooling curtailments at Bugey, Golfech and Nogent, conditions that reverse once temperatures and wind normalise .

Counter-view: Aurora Energy Research's German power team argues the compression understates a genuine structural risk: Flamanville-3's scheduled year-long overhaul from September removes 1,650 MW of French nuclear capacity through the 2026-27 winter, a period when a repeat heatwave-plus-curtailment event would find France with less spare baseload to hold the cheaper leg.

Key tension: Whether the current spread compression is simply weather mean-reversion, as RTE's planning assumes, or the last comfortable reading before Flamanville-3's outage narrows France's margin for the next heat event.

Sources:energy-charts.info

Mentions:France →Germany →EDF →Flamanville-3 →energy-charts.info →Golfech →CCGT →France-Germany day-ahead power spread →

First Reported In

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energy-charts.info· 6 Jul 2026

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Causes and effects

Caused by

France stays the cheaper power leg

The EUR 18-26 spread by 4-5 July is the direct unwind of the EUR 71.50 heatwave peak set on 30 June.

Occurred 30 Jun 2026

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France clears below Germany by EUR 17

France held the cheaper leg established in the 22 June EDF-driven reset through the current unwind.

Occurred 22 Jun 2026

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FR-DE power spread inverts, France on top

The brief 15 June flip to France-as-dearer-leg has not recurred; France stayed the cheaper leg through the unwind.

Occurred 15 Jun 2026

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This Event

France holds cheaper leg, heat unwinds

France kept the cheaper day-ahead leg through the unwind, and the forward risk sits in September when Flamanville-3's year-long overhaul pulls roughly 1.6 GW of nuclear from the fleet.

Led to

French heat flips the FR-DE spread

The 12 July flip reverses the EUR 18-26/MWh France-cheaper spread recorded on 5 July.

Occurred 12 Jul 2026

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