Which NZ power companies are using the API for load control?

There is talk about the smart grid and dynamic control of EV smart chargers.

Which NZ retailers are actively controlling Exnex chargers?
Are any of them offering a discount on the power in exchange for control?

Background:
Genesis Energy did a trail with Exnex 3 years ago but I can not find any follow-up.

Octopus Energy are doing a 5c/kWh discount in collaboration with Wellington Electricity for controlled EV charging but they are only controlling Wall Box for dumb EVs.
I am in the WE network area and have a Leaf.

Ref:

Part of the Resi-Flex project:

Anyone else interested in participating in trails and early adoption programs as and when they happen?