Géothermie à Hawaï

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Géothermie à Hawaï

Message par energy_isere » 30 juin 2012, 16:30

Une centrale géothermique de 30 MW fonctionne depuis 1993.

Le potentiel geothermique est important, mais ce sont les lignes électriques nécessaires qui pourraient étres sensibles aux éruptions.
Hawai`i geothermal energy

june 30, 2012

In Hawai`i, geothermal energy resources depend on volcanic heat. Magma, stored in rift zones, heats groundwater which can be tapped by drilling.


For decades, the State of Hawaii has been trying to reduce our dependence on fossil fuels. Energy from Hawai`i geothermal resources is but one of several alternate energy sources that have been explored.

In Hawai`i, geothermal resources depend on volcanic heat. Magma, stored in rift zones, heats groundwater which can be tapped by drilling. It is then pumped to the surface where its heat is extracted to drive electrical generators.

It makes sense that the most attractive geothermal target in the State of Hawaii is also the most active volcano—Kilauea. The nearly continuous supply of magma to Kilauea pumps heat into the geothermal resource, but it also fuels eruptions that could threaten structures on the volcano.

To make clear where future lava flows are most likely, Hawaiian Volcano Observatory (HVO) scientists published Lava-Flow Hazard Zone Maps as early as 1974, designating the summits and rift zones of Kilauea and Mauna Loa volcanoes as the most hazardous. For Kilauea, the summit and rift zones of the volcano also have the highest geothermal potential, so the Lava-Flow Hazard Map closely resembles the geothermal resource map.

Geothermal resources definitely exist on Kilauea, as established by the HGP-A pilot project in the 1970s. The Puna Geothermal Venture commercial power facility has produced 30 Megawatts (MW) from Kilauea’s heat, 20 percent of the annual electrical usage of the Island of Hawai`i, since 1993.

The most recent study in 2005 suggests that the potential of the Kilauea resource, excluding areas within national parks and state reserves, could be between 250 and 600 MW. Development of geothermal resources may also be possible on volcanoes with less frequent eruptions than Kilauea, such as Hualalai, Haleakala, or Mauna Kea.

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http://www.evwind.es/noticias.php?id_not=19482