The government's plan first requires its re-election in November and involves selling down to 51 per cent government ownership in three electricity companies: Genesis Energy, Meridian Energy, and MightyRiverPower; the state coal company Solid Energy, and Air New Zealand, the last of which has been managed as a government-controlled NZX-listed company for the last decade.
The programme is intended to raise between $3 billion and 7 billion and may take five years to complete.
The government's confidence in New Zealanders' appetites for the shares derived from a mixture of low interest rates making bank deposits less attractive, strong demand for corporate bonds in the last two years, and a growing savings culture as the lessons of the global financial crisis sink in.
Even at $7 billion, total proceeds from the proposed sales were only a small proportion of the $300 million of investments New Zealanders already own, beyond their own homes, said Ryall.
KiwiSaver schemes managed around $9 billion in investment funds already, and that figure was predicted to double in the next four years, New Zealand financial institutions had around $59 billion of funds under managements, and Crown financial institutions including the ACC and NZ Super funds had nearly $40 billion in funds under management and iwi had an estimated $10 billion of assets.
Ryall said the sales were justified because of the country's wider infrastructure, social and other needs that governments would expect to fund.
Partial privatisations would reduce government borrowing needs.
"We would rather pay dividends to New Zealanders than interest on rising debt to foreigners," he said, saying claims the government was selling the family silver were "rubbish", when the Crown expected to spend $78 billion on new government-owned assets over the next five years, before depreciation.