Thursday, October 27, 2011

Google Releases Geothermal Potential Map of the US

Yes, there are idiots. So? Even the Audubon Society supports wind power, so long as you do the (required) bird safety studies and best-practices for bird strike amelioration. Bird turbine deaths are a drop in the bucket compared to most anthropogenic bird death causes, even taking into account its currently limited scale. Our worst are glass windows and the raising of housecats, but everything from habitat destruction to hunting to industrial waste ponds to vehicle strikes kills far more birds than wind turbines. The "wind turbines are bird cuisinarts" notion came from one old, specific wind farm, built in as horrible of a location and manner as possible (Altamont Pass). It was from before the bird strike issue was well known. They built it in the middle of a raptor flyway, using small, low, closely spaced, fast-spinning turbines whose tower structure was inviting for birds to try to perch on. It was a perfect recipe for disaster, and doesn't apply at all to modern wind farms.

There are some concerns about EGS, mainly about earthquakes; however, the quakes are low-level, and all you're really doing is just accelerating what was going to come naturally. Apart from that, geothermal is about as non-intrusive of a power generation method as you can get -- just a plume of steam rising in the distance. There's even one interesting geothermal approach being pursued out there that eliminates even EGS's problems. Instead of drilling open "wells", then fracking a reservoir, then running water through the reservoir, instead you drill a self-contained water-cooled "heat sink" of thermally-conductive grout. Your water working fluid never touches the rock (only the grout does), so it never takes on corrosive minerals or waste gasses, there's no earthquakes (because there's no fracking), and it works reliably, equally well everywhere in the world with the same heat gradient (instead of just in areas with good potential reservoir rock layers) since you don't have to get water to run through a fracked rock layer in just the right manner (one of the big problems with EGS is that you never really know where your water is going to go once you inject it until you drill the well, frack the rock, cross your fingers and try).

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/NgbT8VEuPPM/google-releases-geothermal-potential-map-of-the-us

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