They need a few thousand tons to fill up the tanks.

They're right next to the sea with no working pumps.

If they had electric power they might be able to do more.

When Auckland central business district had a massive power failure in 1998, they got things working by using the generators on a warship from the naval base across the harbour.

The US has a huge warship nearby that must have a larger generating capacity than that NZ destroyer, but they're too scared to go inshore.