I have just received notification from Contact that I am in last month of current plan.
They offer same plan on open terms (no contract) at .60 per day over .30 per day and increase in price of kwh.
My last bill of $129 would be $141. I have averaged over 30% saving on their current price plan over the last 11 mths.
Expect they may come out with something else in next couple of weeks.
Any thoughts?

I suggest you join z electric at least in the short term with their 75l free fuel in 2 weeks without a contract. Best short term deal in nz. https://www.cheapies.nz/node/31239
Minor difference in rates do not make much difference relative to the one off fuel savings in 2 weeks.