Saw this advertised in the paper again. Energy Club charges you the cost price of electricity and then $5 (or $2.40 for low users) per week to be part of their company.
No contracts AFAIK. They have a price calculator so you can work out if this works out better than Powershop, Flick etc. Good discussion here.
They cover a good portion of NZ including Auckland and Wellington but best to check the map or enter your address.
This is a good deal! Currently getting charged 24.62c inc GST per kWh and 35c daily charge with Pulse Energy, and that's after the 3c per kWh discount applied when threatening to leave! With Energy Club NZ it's 24.51c with a similar daily charge. Hurray for the (relatively) competitive electricity market!