Eni SpA (E), Italy's biggest energy company by market value, said the six-year bond it will sell to households will be worth up to EUR1.35 billion, more than originally planned, on higher demand.

The announcement was available on its website Tuesday.

Eni's sale of the fixed- and floating-rate bonds, which ended Monday, started in September for a total initial amount of EUR1 billion. It had said it could increase the figure to EUR2 billion in the event of excessive demand.

Last month, Chief Financial Officer Alessandro Bernini said the bond was a "means" to finance Eni's large investment program. The sale will help Eni in its target of lengthening the duration of its debts, he added.

The Rome-based company is expected to give final details of the sale later this week.