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Below that, in the deeper layer, the temperature is effectively constant, rising about 0.025 °C per metre according to the geothermal gradient. The "penetration depth" [3] is defined as the depth at which the temperature variable is less than 0.01 of the variation at the surface. This also depends on the type of soil:
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.
In total, electrical station construction and well drilling costs about 2–5 million € per MW of electrical capacity, while the levelised energy cost is 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 levelized costs above $0.054 per kW·h ...
Geothermal power station ; Type: Flash steam with binary cycle [1] Wells: 55 production 6 reinjection 50 monitoring [1] Max. well depth: 660 m (2,170 ft) [1] Power generation; Units operational: 6× 11.2 MW 3× 30 MW 1× 4 MW 1×14 MW binary: Nameplate capacity: 175 MW: Capacity factor: 89.0%: Annual net output: 1365 GWh [1] External links; Commons
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]
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.
[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 ...
Humans have taken advantage of geothermal heat this way since the Paleolithic era. Approximately seventy countries made direct use of a total of 270 PJ of geothermal heating in 2004. As of 2007, 28 GW of geothermal heating capacity is installed around the world, satisfying 0.07% of global primary energy consumption. [1]
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