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  1. teara.govt.nz

    Britain, New Zealand and Europe after 1940

    Sterling area On the outbreak of the Second World War, countries allied to Britain agreed to share the proceeds of their earnings from exports and hold them in pounds sterling – the British currency. This was the beginning of the ‘sterling area’. After th ...

  2. teara.govt.nz

    Heat from the earth

    The word ‘geothermal’ comes from the Greek and means ‘heat from the earth’. Deep inside the earth heat is released by the decay of radioactive elements such as uranium and thorium. Geothermal systems occur where circulating groundwater is heated and rises ...

  3. teara.govt.nz

    Wairākei geothermal power station

    Harnessing underground steam to generate electricity is one of the world’s more unusual engineering feats. The earliest experiments were carried out at Larderello in Italy, where the world’s first geothermal power station was opened in 1913. New Zealand a ...

  4. teara.govt.nz

    Geothermal power production

    Turning steam into power New Zealand’s geothermal power stations produce electricity using the following process: Geothermal fluid – a naturally occurring mineralised mixture of pressurised water and steam heated to between 200º and 300ºC – is drawn from ...

  5. teara.govt.nz

    Other uses of geothermal energy

    Industrial processes Most of New Zealand’s geothermal energy goes to produce electricity, but it can be used for any processes where heat is required. The main non-electrical user is the Tasman Pulp and Paper Mill at Kawerau, which was built in 1957 and d ...

  6. teara.govt.nz

    Effects on the environment

    Depletion of resources The process of extracting geothermal fluids (which include gases, steam and water) for power generation typically removes heat from natural reservoirs at over 10 times their rate of replenishment. This imbalance may be partially imp ...

  7. teara.govt.nz

    Transport

    Transport links assisted settlement and helped Waikato agriculture and industry develop. Coastal and river shipping In the 19th century people entered and left Waikato through west-coast seaports, including Port Waikato, Raglan Harbour (Whāingaroa) and Kā ...

  8. teara.govt.nz

    Waikato River

    At 425 km, the Waikato is the longest river in New Zealand. It begins on the slopes of Mt Ruapehu, draining into Lake Taupō and exiting at the north-east. After flowing through a string of hydroelectric dams and passing through lowlands between Cambridge ...

  9. teara.govt.nz

    The US and New Zealand

    supporter of US involvement in South Vietnam, with soldiers serving alongside US forces in that country. ...

  10. teara.govt.nz

    Australia and New Zealand

    The Australian colonies united in 1901. New Zealand could have joined them, but chose not to. At that time New Zealand conducted around 14% of its trade with Australia, while the Australian colonies conducted between 25% and 55% of their external trade wi ...

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