France imports in hot/dry summers when the rivers are overheating from cooling the nuclear powerplants. France imports in cold winters when their nuclear reactors are not sufficient to power the electrical heating for the homes...
http://www.businessinsider.com/french-heat-wave-one-tumultou...
> France imports UK electricity as summer heatwave puts a third of its nukes out of action
https://thinkprogress.org/france-imports-uk-electricity-as-s...
> Germany powers France in cold despite nuclear u-turn
https://www.reuters.com/article/europe-power-supply/germany-...
> France was heavily dependent on power imports from Germany during the first cold spell of this winter, despite the fact that most of the country’s nuclear reactors are back online