There may be an additional, geopolitical element to Germany buying France's nuclear energy. This is an implicit subsidy of the EU's only nuclear weapons state,

There may be an additional, geopolitical element to Germany buying France's nuclear energy. This is an implicit subsidy of the EU's only nuclear weapons state, post Brexit. To make sure the EU (not the same as NATO) continues to have a nuclear deterrent of its own, France must be recompensed.