France should have no problems with energy supplies, the head of the country's regulator CRE Jean-François Carenco said, adding that asking users to be careful is normal, Reuters reported.

Earlier, Germany announced an "early warning" of a possible gas supply emergency, which is meant to prepare for the risk of disruption or stoppage of flows from Russia.

"Everything will be fine, the gas storage facilities are well filled, we will survive the winter," CRE head Jean-François Karenko told French TV channel BFM.

Germany's statement is the clearest sign that the European Union is preparing for supply disruptions after the imposition of sanctions against Russia.

Laurence Poirier-Dietz, head of France's leading natural gas distribution operator GRDF, told Les Echos newspaper that the country was bracing for possible Russian-linked supply disruption next winter.

GRDF distributes natural gas to more than 11 million customers every day for heating, cooking, mobility and industrial processes.

Among those customers, only large industrial clients or shopping malls would be asked, if needed, to reduce their demand, Poirier-Dietz said. Individual customers, public services and the military would be exempted from such a move.