New Zealand uses 240 volt three phase electricity (power) and most
plugs are three pins. Many shops like Dick Smith Electronics have adapter plugs that students and visitors can buy so they can use their own appliances (hair dryers etc) in New Zealand. Do not try and force your overseas plug into the New Zealand power connection.
Most of New Zealand's electricity is generated from hydro (water) electric power stations although there are also coal and thermal power stations. Electricity is expensive and is used in many homes to heat hot water
so this is another reason not to take long showers. Most homes pay a monthly electricity account of NZ$100 to NZ$250 (in the winter).
Take care to turn off all lights, heaters and computers when you are not in your room to save electricity.