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France stays the cheaper power leg

3 min read

10:53UTC

France cleared EUR 123.50/MWh on 30 June against a far dearer Germany, an FR-DE spread of EUR 71.50 that held even as EDF curtailed 12% of its nuclear fleet.

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Key takeaway

French nuclear curtailment cut volume not price, holding the FR-DE spread at EUR 71.50 with France cheaper.

France cleared EUR 123.50/MWh on 30 June while Germany's all-thermal stack cleared far above it, leaving a France-Germany day-ahead spread of EUR 71.50 with Germany the dearer leg ¹. Going into the heat, desks had watched whether river-temperature curtailment of French nuclear would flip that spread and make France the expensive side. It held the other way.

France runs Europe's largest nuclear fleet, which usually keeps its wholesale power below Germany's gas-and-coal pricing. Heat threatened that edge: warm rivers limit the cooling water reactors can return, forcing operators to throttle. Even so, EUR 71.50 sits below the series records of EUR 93.68 on 3 June and EUR 96.20 on 8 June , so the gap widened without breaking new ground.

France stayed cheaper even as EDF (Électricité de France, the state nuclear utility) deepened curtailments to 12% of the fleet on river-cooling limits, taking Bugey 3 (910 MW) offline and throttling Golfech and Nogent 2 . The floor held because curtailment removes volume, not the low-cost baseload that sets the French price. The trend that reset France as the cheaper leg on 22 June carried through ; the spread inverts only when curtailment strips out enough baseload to push gas to the margin in France too, which 12% of the fleet did not reach.

Deep Analysis

In plain English

France generates most of its electricity from nuclear power stations. These stations cool their reactors by drawing water from rivers like the Garonne, Seine, and Loire. French environmental law prevents the stations from warming those rivers above 28 degrees Celsius (the river discharge limit), so when a river gets that hot in summer, the station must reduce or stop output to prevent overheating the water. On 30 June, EDF, the French state energy company, cut output at three reactors that had reached this river-temperature limit: Bugey 3 on the Rhone (offline at 910 megawatts), Golfech on the Garonne, and Nogent on the Seine (both throttled). That removed 12% of France's total nuclear output. But because the remaining 88% of France's nuclear fleet was still operating cheaply, France's electricity price of EUR 123.50 per megawatt-hour stayed well below Germany's EUR 195, which was set by expensive gas power plants filling the gap left by almost-zero wind. The EUR 71.50 price difference means French industrial buyers paid about a third of what German buyers paid that day.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: France's August 2022 curtailment crisis, when EDF shut or throttled approximately 25-30% of the nuclear fleet simultaneously on combined river-cooling, corrosion-inspection, and scheduled-maintenance constraints, pushed France from its habitual position as Continental Europe's cheapest power market to a net electricity importer for the first time in decades.

Day-ahead French prices briefly tracked German gas-set prices, eliminating the structural FR-DE spread that industrial buyers had relied on for load-switching decisions. At the 25-30% curtailment threshold, nuclear no longer anchors the French merit order.

Counter-parallel: France's summer 2019 heat event, when EDF invoked the same 28 degrees Celsius river-discharge derogation and curtailed approximately 15-20% of fleet, illustrates the opposite outcome: France remained the cheaper power market throughout, because the residual 80-85% of the nuclear fleet cleared below any gas alternative and the spread versus Germany remained positive throughout August 2019. At 12% curtailment in June 2026, the situation more closely resembles 2019 than 2022.

Consensus view: IFP Energies nouvelles, the French public energy research centre, assesses that EDF's river-temperature derogation system is calibrated to protect French clearing prices at curtailment levels up to approximately 15-18% of fleet: the regulatory 28 degrees Celsius river-discharge ceiling triggers plant-by-plant, and at 12% curtailment the residual nuclear baseload in the merit order still clears at a cost well below any thermal alternative, meaning France exports low-cost power even while individual reactors are offline.

Counter-view: Timera Energy's European power market team argues that the 30 June spread of EUR 71.50/MWh understates the tail risk in the current river-temperature trajectory: Bugey 3, Golfech, and Nogent are the first three plants to curtail under the derogation system, but Civaux (2 x 1,495 MW on the Vienne river) and the Chinon complex on the Loire face the same river-temperature ceiling and could trigger if temperatures rise a further 2-3 degrees Celsius, pushing fleet curtailment from 12% toward 25-30% and potentially forcing gas plant into the French marginal pricing stack.

Key tension: Whether French river temperatures stabilise in July at levels that keep fleet curtailment below the 20-25% threshold where gas enters the French merit order, or whether continued heat pushes EDF into a second-wave derogation round that would compress the EUR 71.50 FR-DE spread.

Sources:Montel News·euenergy.live

Mentions:France →Germany →Golfech →Nogent-sur-Seine →EPEX SPOT →Timera Energy →France-Germany day-ahead power spread →Bugey 3 →EDF →

First Reported In

Update #22 · Germany refills as the autumn cliff nears

Montel News· 30 Jun 2026

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Causes and effects

Caused by

French reactors curtail on river heat

EDF's nuclear curtailments deepening to 12% of the French fleet on river-cooling limits, with Bugey 3 offline and Golfech and Nogent throttled, constrained French volume without pushing gas to the margin, leaving the FR-DE spread at EUR 71.50 without inversion.

Occurred 23 Jun 2026

Read story →

France clears below Germany by EUR 17

The FR-DE spread trend that reset France as the cheaper leg on 22 June held through 30 June; Germany's all-thermal pricing persisted while French nuclear kept low-cost baseload in the merit order.

Occurred 22 Jun 2026

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This Event

France stays the cheaper power leg

River-temperature cuts to French nuclear trimmed volume but not price, so France stayed the cheaper leg of the FR-DE spread despite the heat.

Led to

France holds cheaper leg, heat unwinds

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 4 Jul 2026

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Spark stays negative, French edge erodes

The German gas-set stack compressed the France-Germany day-ahead spread to EUR 5.37/MWh near-parity on 23 July, erasing the discount France held on 30 June despite EDF's nuclear output cuts.

Occurred 22 Jul 2026

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River heat cuts 7.6 GW off EDF's fleet

A comparable river-temperature curtailment on 30 June also cut roughly 12 per cent of French nuclear output but did not flip the France-Germany spread, because those cuts removed volume rather than the low-cost baseload that sets the French price; 3 August's flip cannot be attributed to curtailment scale alone.

Occurred 2 Aug 2026

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Different Perspectives

Cross-border power traders

The France-Germany day-ahead spread flipped from a EUR 17.20 German premium on 1 August to a EUR 4.15 French premium on 3 August, the same day French curtailment peaked. They cannot yet attribute the flip to curtailment alone, since a like-for-like overnight comparison shows French nuclear output rising while wind fell and demand returned on the weekday step.

EDF

River-cooling limits took 7.6 GW, 12 per cent of its fleet, offline on 3 August, the highest curtailment since the heatwave began, with an easing forecast to 4.3 GW on 4 August and 3 GW after. It manages the cut as a recurring seasonal constraint, expecting it to lift with river temperature, not repair.

Gasunie

TTF, the Dutch hub it operates, drifted to roughly EUR 55 to 58 per MWh across the window, staying inside its recent range through both the German spark reversal and the French curtailment. It reads a flat hub price as evidence that neither event this window carried enough weight to move the fuel leg on its own.

German gas-fired generators

Record German solar of 18,761 MW on 2 August pushed the clean spark spread to minus 18.48 EUR/MWh, a loss-making day, before it returned to plus 16.20 on 3 August. They now price dispatch against post-solar residual load rather than wind alone, since the sign flipped inside 48 hours on unchanged fuel and carbon costs.

European Commission (DG Energy)

Its implementing-measures register logged transposition notices from only Portugal and Slovakia against Wednesday's Article 94 deadline for Directive (EU) 2024/1788, with 25 states silent. It expects the register to fill only gradually, since filing routinely lags legislating and any infringement track against non-notifying states runs on a slower clock than the deadline itself.

Spain's LNG terminal operators

Spain's 9,145 GWh terminal inventory is the largest single stock in the EU LNG network, an option value that can reroute cargoes wherever the winter strip pays best rather than a cavern gas obligation tied to a fixed date. That flexibility matters more as Germany's cavern shortfall pushes more of the winter security question onto import infrastructure.