Currently, in New Zealand, there is car-sharing, car rentals and taxis, all offering EVs.
The following links may help you:
Easy Transport Waiheke
Car Sharing: Because owning a car is no longer the future. Millions of people around the world are already very successfully car sharing. Remove the pains & costs of owning your own. Yoogo Share is a membership-based service and is free to join. They have bases in Christchurch and now Auckland. Vehicles available are BMW i3 and Hyundai ioniq.
EV Rentals: If you need a longer rental, try Europcars, available at Auckland, Wellington and Christchurch Airports. Vehicle type available is Volkswagen eGolf.
Blue Cars offer Nissan LEAF or Tesla EVs in Auckland, Whangarei or on Waiheke Island. They will refund the cost of your car hire if you decide to purchase the vehicle.
EV Taxis: Green Cabs currently operate in Auckland, Christchurch, Dunedin, Queenstown, and Wellington. (Nissan LEAFs)
Also on Waiheke Island, an all-electric service is available at Easy Transport. Offering Nissan LEAF and eNV200 van.