Marsden Point's top boss claims shutting down oil refinery at the site won't jeopardise New Zealand's fuel supply.

Refining New Zealand today voted to convert Marsden Point into a terminal that only imports processed petrol and diesel.

It ends six decades of the country having its own ability to produce fuels - with the switch set to be complete mid next year.

But Chief Executive Naomi James told Heather du Plessis-Allan we already import all of our fuel requirements today.

"70 percent is coming in as crude oil that we refine at Marsden Point, 30 percent is coming in as already refined product."

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• Refining NZ to switch Marsden Point to import-only terminal