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The Krafla geothermal power plant consists of two 30-megawatt units, with double pressure inlet and dual-flow turbines with 5 steps on each side. It takes its energy from 17 high-pressure production wells with 110 kg/second of 7.7 bar and, due to new technologies, 5 low-pressure production wells with 36 kg/s of 2.2 bar.
The geothermal production well reached a depth of 5,275 m (17,306 ft) and the fluid injection well 2,393 m (7,851 ft). [ 3 ] [ 1 ] Between August 2020 and July 2021, the wells underwent a series of injection tests to analyse the hydrology within the fractured geothermal reservoir.
NM4 was the first well in New Zealand to encounter a pluton, at a depth of almost 2400m. Mighty River Power undertook further drilling in 2008-09, with wells NM5, NM6, and NM7 drilled to depths of 2997m, 3398m, 2963m respectively. [5] Resource consents for further development were granted in May 2010. [6]
The geothermal water is supplied by five production wells and injected by six injection wells. There is a program to add three new production wells. [1] The depth of wells is 4,000–8,000 feet (1,200–2,400 m). [2] The technology was supplied by Ormat Technologies. [1] [2] The well drilling contractors were ThermaSource and Ensign. The piping ...
As of 2007 plant construction and well drilling cost about €2–5 million per MW of electrical capacity, while the break-even price was 0.04–0.10 € per kW·h. [10] Enhanced geothermal systems tend to be on the high side of these ranges, with capital costs above $4 million per MW and break-even above $0.054 per kW·h.
Nga Awa Purua is New Zealand's second largest geothermal power station [2] and the steam turbine is the largest geothermal turbine in the world. [ 3 ] The power station is a joint venture between Mercury Energy (75%) and the Tauhara North No 2 Trust (25%), who represent about 800 owners affiliated to Ngati Tahu. [ 4 ]
[1] [2] [3] The power plant feeds from the 182 °C Gümüşköy Geothermal Reservoir, which was discovered with the GK-1 geothermal well in October 2008. [4] The power plant has a gross installed power capacity of 13.20 MW divided in two units and uses two Ormat, Israel manufactured units for energy generation. Annual production is 108.24 GWh ...
As of 2012, the power plant generated 100MWe from two high pressure 50MWe turbines, using steam and brine from a reservoir at 290 to 320 °C (554 to 608 °F), which is extracted from 12 wells that are 2,700 m (8,900 ft) deep. This was the first time that geothermal steam of such high temperature had been used for electrical generation. [1]