The Prime Minister will officially opened New Zealand's newest wind farm near Raglan in Waikato on Thursday.
The 28 turbine wind farm is a joint venture between state-owned generator Merdian Energy and Waikato lines-company WEL Networks.
The wind farm will generate 64.4 megawatts of electricity, which is enough to power about 30,000 average homes.
Electricity was first generated from the $200 million project in November, eight weeks ahead of schedule.