The proceeds will initially be used to repay debt and would not be used to pay a special dividend, or for a share buyback, Vector said.
Vector said it had also entered a memorandum of understanding with First State Funds to consider opportunities to co-invest in regulated and unregulated energy infrastructure, both in New Zealand and offshore, and to co-operate operationally on gas distribution activities.
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First State Funds comprises two infrastructure funds managed by First State Investments - known in Australia as Colonial First State Global Asset Management - a global infrastructure asset manager, with about $7 billion invested in infrastructure assets across Australia, New Zealand and Europe.
See a corporate profile of First State Funds here:
The sale is conditional only on approval under the Overseas Investment Act 2005, and by the shareholders of Vector, which will be sought at a special meeting expected to be held in December.
Goldman Sachs acted as the company's financial advisor throughout the strategic review process.
Vector's biggest shareholder is the Auckland Energy Consumer Trust, which has a 75.1 per cent stake. Its shares last traded on the NZX at $3.33.
See the latest Vector announcement here: