As part of being a finalist, the kindergarten has to put together a 30 second video summarising the achievement outlined in its entry.
It's here the kindergarten is hoping to have the "winning difference", with dad and filmmaker Giles McNeill lending his expertise to the video.
"For him to do this for us is quite huge," Goodhue said.
The kindergarten is part of the Enviroschool National programme. It collects water in a tank and uses it for fruit trees and vegetable gardens.
The children also grow their own vegetables, cook what they grow and use the leftovers for compost and worm farms.
All parents are asked to pack plastic- and waste-free lunch boxes for the children meaning anything leftover will be composted, worm farmed or recycled.
Among other initiatives, the children have an area next to the kindergarten they call The NatureHood, where they can explore and connect with nature and each other.
Goodhue said their families and the community are very supportive of what they do.
"We have a real strong commitment from our families."
Portland Kindergarten is looking for sponsors to help it attend the awards gala dinner on October 26 at the Maritime Museum in Auckland.
Tickets are $200 each and the kindy is hoping to send three teachers.
EcoStore, which started in Northland, is also a finalist in the Most Sustainable Large Business Award, alongside Road Metals and Waste Management.
