Prime Minister John Key has confirmed the Citizens Initiated Referendum over asset sales will take place in late November and early December this year.
Mr Key said the referendum would take by postal ballot, opening on November 22 and closing on December 13.
The referendum would cost $9m he said.
The referendum will ask whether New Zealanders support the Government's sale of up to 49 per cent of Meridian, Mighty River Power, Genesis Power, Solid Energy and Air New Zealand.
It is not binding on the Government.