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Next week, nuclear power production will be limited by high temperatures in the French River

The French utility?EDF warned Thursday that production at three nuclear reactors would be curtailed next week due to high temperatures along the Rhone and Garonne rivers. France is currently experiencing its second heatwave of this spring.

The French nuclear output has been fairly consistent in recent years, as it has recovered from the lows of several previous years. However, the exceptional heatwaves that occurred at the end of spring in the northern hemisphere have increased water temperatures above levels where reactors are at risk of a?curtailment of their output.

EDF, the operator of the nuclear fleet in the country, limits production at times when temperatures reach a certain threshold. This threshold varies according to the type of plant. Shallower and slower rivers are more likely to be affected.

The company issued warnings about production at the Golfech, Blayais and Bugey nuclear plants located on the Rhone river in the southeast as well as on the Garonne in the southwest. It also updated an earlier warning it issued on Thursday that the Saint Alban nuclear plant, located in the Rhone region, was likely to be affected as of June 23.

Next week, the heat is expected to intensify.

LSEG data indicated that temperatures are expected to reach river temperature thresholds at Cruas and Tricastin nuclear plants, as well as Chooz, Nogent, and Chooz.

Analysts at Engie EnergyScan predict temperatures to continue to rise next week. They expect to see temperatures close to 8 degrees Celsius (46,4 degrees Fahrenheit), a few degrees above the seasonal norms of low 30s. This will likely increase demand for cooling. Summer thermal restrictions, however, are typically small and only account for a fraction of a percent. The temperature-driven curbs may add EUR5 per megawatt hour to the prices on those days but shouldn't cause a seasonal structural increase, according to AlphaValue analyst Pierre Alexandre Ramondenc.

He added that if insufficient volumes result in forced shutdowns this could lead to a 'price swing of several tens per megawatt hour on intraday peaks, and 'day-ahead pricing. This year, hydro availability has been limited due to the lack of snow and rain in autumn and winter. The result is higher power prices. Recently, the French spot 'price' has also been high for this?season as a combination of hot temperatures and low renewable output have pushed up prices. The French front-month contract has risen above EUR60/MWh recently, reflecting the market's concern over continuing heat.

(source: Reuters)