Natixis economist Patrick Artus further warned that an intensification of speculative attacks by traders on bond and currency markets could unleash a vicious circle resulting in recession in the eurozone and depreciation of the euro.

But the proposal put forward by Germany is very, very complex and would require a modification of the treaties, the official said.

Conti pointed out that 18 percent of the electricity imported by Italy was already nuclear-generated, coming mainly from France.