French renewable curtailments set to double in 2026 as nuclear fleet returns

French renewable curtailments set to double in 2026 as nuclear fleet returns Rising baseload nuclear output risks squeezing renewables off the grid at the same time France wants them to replace gas heating. French renewable generation curtailment could double year-on-year in 2026 as the country's resurgent nuclear fleet crowds out wind and solar during periods of low demand, an analyst told Montel on Friday (2026-07-17). The timing puts pressure on France's electrification plans: the government last month (week of 2026-05-11) unveiled a plan to double support for electrification to around €10bn per year through 2030, up from €5.5bn currently.² The ambition is to replace 85 TWh of gas in the building sector — equivalent to 20% of current gas imports.² A grid that routinely curtails cheap wind and solar makes that target harder to reach. Industry analysts told Montel that France's tax system already tilts the field toward gas over electricity, adding an independent constraint on the electrification push.² The certificate scheme designed to reward switching carries uncertainties that market participants said weigh on investment decisions.² The nuclear fleet's longer-term expansion faces a separate challenge in Brussels. The European Commission launched an investigation on Tuesday (2026-05-19) into France's plan to subsidise construction of six new reactors with a combined 10 GW of capacity, at an estimated cost of €73bn in 2020 euros.¹ France's economy and energy ministry told Montel that negotiations would continue for "the coming months," with the government committed to providing all additional information the Commission required.³ EDF's half-year report flagged ongoing compliance deadlines and workforce targets tied to the new-build programme.⁵ A delayed or restructured subsidy deal could slow new capacity entering service. Near-term curtailment risk is driven by units already back on the grid after corrosion-related outages, not those still to be built. A separate EU grid package has drawn sharp criticism from France's energy regulator CRE. Its head, Emmanuelle Wargon, told Montel on Thursday (2026-04-09) that parts of the proposals were "dangerous" for the way Europe's power markets function.⁴ If the package restricts member states' ability to manage domestic grid congestion, curtailment hours in France could increase faster than the analyst's doubling forecast already implies.⁴ For gas traders the signals pull in opposite directions. France's plan to replace 85 TWh of gas annually through electrification is a long-run bearish demand signal, but only if curtailment does not keep power economics unattractive.² Higher nuclear availability in the near term suppresses thermal generation requirements, weighing on ICE Endex TTF. The front-month was at €54.82/MWh, down 1.5% on Friday (2026-07-17). Industrial demand adds a further complication. European Commission estimates put global steel overcapacity at 721 million tonnes by 2027, nearly five times total EU consumption.⁶ If EU trade policy responses to Chinese industrial exports weigh on domestic heavy-industry output, power demand growth could disappoint, leaving even more room for French nuclear baseload to crowd out renewables.⁶ The concrete signals to monitor in the weeks ahead: RTE's actual curtailment data, EDF's maintenance schedule for currently operating units, and whether the European Commission attaches dispatch-related conditions to France's nuclear subsidy approval.¹ A heavier-than-expected summer outage programme would ease near-term crowding pressure; tighter schedules would confirm the forecast and deepen the tension between France's nuclear build-out and its renewable expansion goals.³