In the 1980s the Geological Society of New Zealand listed the country’s geothermal fields according to their importance. This table shows the five most important (Category 1) fields, classified as having international significance. It was recommended that preservation of surface thermal activity should have precedence over utilisation.
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Source: Inventory of New Zealand geothermal fields and features. Miscellaneous Publication 44. 2nd ed. Lower Hutt: Geological Society of New Zealand, 1999.