RTE (Reseau de Transport d'Electricite)
France's national high-voltage electricity transmission operator, majority owned by EDF Group.
RTE, France's transmission operator, argued a grid-security case that let two Bugey reactors keep running under a relaxed thermal-discharge limit from 10 to 20 July 2026, holding French power cheaper than Germany's.
Last refreshed: 3 August 2026 · Appears in 1 active topic
Why did France's grid operator insist two Bugey reactors keep running through the heatwave?
Timeline for RTE (Reseau de Transport d'Electricite)
Mentioned in: Two capitals filed on the gas directive
European Energy MarketsMentioned in: River heat cuts 7.6 GW off EDF's fleet
European Energy MarketsCRE lets grids buy local flexibility
European Energy MarketsRequired minimum Bugey 4 and 5 output as a public necessity for grid security
European Energy Markets: France cheaper on a waiver ending todayBackground
RTE (Reseau de Transport d'Electricite) is France's electricity transmission system operator, carved out of EDF in July 2000 to meet EU rules separating transmission from generation, and made a standalone limited company through further legal acts in 2004 and 2005. It remains majority owned by the EDF Group and the Caisse des depots.
RTE operates roughly 100,000 kilometres of high-voltage lines, the largest transmission network in Europe, and is responsible for keeping the grid balanced in real time, including deciding when nuclear output needs protecting from environmental curtailment. On 30 July 2026, regulator CRE authorised RTE, alongside distribution operator Enedis, to run trials of France's first local flexibility market, extending its balancing role down to distribution-level assets.
It argued for keeping Bugey running
RTE's case for minimum output from Bugey reactors 4 and 5, recorded in regulator ASNR's derogation order as a 'necessite publique', was what let the reactors keep running under a relaxed Rhone thermal-discharge limit from 10 to 20 July 2026. France cleared EUR 98.95/MWh on 20 July against Germany's EUR 103.16, a discount that held on the nuclear output RTE's request had preserved.
The Bugey case is one of several RTE has had to make each summer as heatwaves push river-cooling limits and demand into conflict, and it illustrates how much of France's nuclear fleet the operator has to actively manage rather than simply dispatch once the waiver expires.