The Green Party says the Government's partial privatisation programme has now cost more than $250 million.
Greens energy spokesperson Gareth Hughes says that is three times more than the projected cost of the share sales.
Mr Hughes says the Government has released figures revealing the Treasury and the companies put up for sale have spent $70 million on the process.
However, he says that figure does not include the cost of the Mighty River bonus share scheme, Meridian's buy now-pay later scheme, the $30 million payment to Rio Tinto and the foregone dividend payment from Mighty River.
He says the asset sales have also failed to raise as much money as the Government promised.
