Grange, L.I. 1955 Geothermal steam for power in New Zealand. Wellington: DSIR. DSIR Bulletin 117 102 p.
Abstract: This bulletin is a review of the geothermal potential in the Wairakei region which outlines the geology and hydrothermal processes to be found here with the various aspects of drilling for geothermal power. Over the years people in many countries have utilised the heat of springs and fumaroles in volcanic areas. Th New Zealand the Maoris who lived in the Rotorua-Taupo district cooked their food in the boiling water and the steaming ground. More recently, since European occupation, the hot water of springs has been used for heating, and later shallow bores were sunk to obtain steam and hot water for a similar purpose. The first large-scale attempt to utilise the steam power to drive heat engines was in Italy at the beginning of the twentieth century, Th drill holes located at Larderello in northern Italy are in areas containing weak fumaroles. The operations were highly successful, and today steam from numerous bores is producing more than 250,000 kw of power. It is not surprising that, as a result of developments in Italy, observers advocated making tests in New Zealand's volcanic region. Many test and production wells have now been drilled. The active volcanic region of New Zealand extends from Ruapehu to Taupo, Rotorua and to White Island in the Bay of Plenty, a distance of about 150 miles. It trends north-easterly and has a width of about 30 miles. Hot springs are abound and there are some fumaroles. Ngauruhoe, Ruapehu and Tongariro at the southern end are active andesite volcanoes. At two periods in historic times lava has poured down the slopes of Ngauruhoe and at one period lave has arisen in the crater of Ruapehu and been explosively emptied. On 10 June 1886 Tarawera, a volcano southeast of Rotorua explosively erupted basalt lapilli and ash (auth)