energyclubnz is offering a $100 credit for new signups until Jan 6. This is double the $50 offer they usually have on. You need to be a customer with them for 6 months otherwise they may reverse the credit as per the T&Cs.
T&Cs:
*Offer terms & conditions: Joining credit is not valid in conjunction with any other offer and is not redeemable for cash. Offer valid until 06/01/2019. This offer is only valid for first time customers. If you cease to be an energyclubnz customer within 6 months of signup energyclubnz has the right to reverse the value of the joining credit and add it to your final bill.
Seems like your house needs to have the smart meter installed for them to take you onboard…