There is no mains gas supply in the South Island, but it is available in some parts of the North Island. The costs for mains gas varies and depends on the plan you choose. An average bill for the year ranges between $700 and $900. The Consumers’ Institute website (www.consumer.org.nz) has a gas price calculator, which will help you get an idea of costs. Bottled gas is also available for those who prefer cooking on gas stoves or who like the warmth and convenience of gas heaters.