Labour leader Phil Goff has written to the Australian investment bankers hired by the Government to give them a message - "hands off our assets''.
Mr Goff said he wrote to Melbourne-based Lazard managing director John Wylie to inform him that if Labour won the election, the company's contract would be cancelled immediately.
Mr Goff attached a copy of his letter to his press release today.
"My message to these Australian bankers is simple - hands off our assets,'' Phil Goff said.
"These assets _ Mighty River Power, Meridian Energy, Genesis Energy, Solid Energy and Air New Zealand _ perform exceptionally well in the interest of all New Zealanders. They return hundreds of millions of dollars in revenue to the taxpayer every year. If John Key is allowed to sell them they will be gone forever and New Zealand will be poorer.
"They are ours, we already own them. We don't want them sold and we don't want Australian bankers pocketing $100m as they clip the ticket during the sale. Labour is determined to stop the sale of our assets.
"My first action as prime minister will be to cancel the sale process that the National Government has already started despite John Key promising that they would get a mandate from the New Zealand people first.
Mr Goff CCed the letter to Treasury chief executive Gabriel Makhlouf.