The the access provider for both the copper and fibre network (right to the customer premises) is a regulated wholesale only provider, which is required to provide open access to its network on a non-discriminatory basis between all access seekers (retail telecommunications companies).[0]
This almost entirely resolves the net neutrality debate in New Zealand.
[0] This is a slight simplification: Chorus is the network owner for the copper network, and about 70% of the fibre network. The other 30% of fibre network is also built, owned and operated by wholesale only providers on a comparable basis.