Word: deeps
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...Innamincka has some of the hottest rocks anywhere, and Geodynamics has spent $150 million drilling deep into them. The biggest and most advanced of some 40 companies seeking to capture Australia's underground heat, it aims to be the first to prove that deep-earth geothermal power is commercially viable. Geothermal is already a bit player in the power business: underground water heated by volcanoes is already used for heating and electricity generation in countries like Iceland and New Zealand. But supplies of natural hot water are limited. The new push is to mimic nature by creating artificial water-heating...
...original plan was to pump water deep underground under high pressure, in order to crack the granites and create a path for the water to flow. Superheated by contact with the rock, the water would be pumped to the surface from a second well 1 km away, to create steam to drive a power turbine, then be pumped into the earth again...
...there was no need to add water: it was already there, trapped underground at high pressure for the past 3 million years. Getting the hot water to the surface hasn't been easy, and one well had to be abandoned. But Geodynamics now says the flow from 4 km deep is sufficiently strong and hot to run a 1-MW power station by the end of the year - enough to power the drilling-camp site and Innamincka...
...Ranges later this year and produce commercial amounts of power before Geodynamics does. Petratherm, with projects in Spain and interests in China, already has an agreement to supply 7.5 MW of power to the Beverley uranium mine, 11 km from its drilling site. The company won't go as deep as Geodynamics. Instead, it will try to push its water through 200°C sedimentary rock, just above the hot granites...
...there Obama is, in his first TV advertisement of the general-election campaign, talking about his "deep and abiding faith in the country I love." And there, perched below his left shoulder, is a subtle, but not too subtle reminder: a tiny American flag...