Kawerau Geothermal System
About the system
The Kawerau Geothermal System is near Kawerau township, and is centred on the flood plains of the Tarawera River between Pūtauaki/Mount Edgecumbe and the Onepu Hills. It has high levels of existing extraction for industrial purposes, as well as for heating the community pools at the Maurice Kjar Memorial Swimming Pool complex.
History of use and management
Kawerau became the first geothermal production field in New Zealand in the 1950s, as part of the Tasman Pulp and Paper Mill development. The system has been extensively developed since then and several companies now have consents to draw on the resource, including Mighty River Power, Ngāti Tūwharetoa Geothermal Assets, Eastland Developments, and Te Ahi o Māui.
Production wells are typically between 1-2 km deep and downhole temperatures range from 250-315 °C. Steam is provided to industrial users for power generation, as well as paper and timber drying. A total of over 150,000 tonnes of geothermal fluid is consented to be used each day.
This long history of development, along with multiple users and large number of wells, makes the Kawerau system complex to manage. Its state is closely monitored and modelled by users as part of resource consent conditions.
Values of the resource
Industrial use of the geothermal resource and electricity generation brings significant economic benefit to the region. Not all consented takes are currently in production, so use is expected to increase in the future. The community bathing pools in the Kawerau township were opened to the public in 1957, and continue to be a very popular facility.
Historically the system had surface features, such as springs along the banks of the Tarawera River and the southern shore of Lake Rotoitipaku. However, these features have declined due to both natural and man-made causes. Seepages and steaming, hot ground still exist in some areas and some springs remain for local use.
Managing the system
The Kawerau system is classified as a Development System in the Regional Policy Statement. It is managed under the Regional Water and Land Plan, which will be part of a wider plan change process in 2018. The Regional Council is also working with users to develop a System Management Plan, with the aim of efficient and sustainable management of the system. This document will be developed in 2016.
The Crown has acknowledged Ngāti Tūwharetoa (Bay of Plenty) have particular cultural, spiritual, historical, and traditional association with, and use of, the geothermal energy and geothermal water located in the Kawerau Geothermal system. For more information, see Ngāti Tūwharetoa (Bay of Plenty) Statutory Acknowledgements.