Slashdot Mirror
Iceland To Drill Hole Into Volcano
G3ckoG33k writes "BBC reports that Iceland will drill a hole into a volcano so it can tap heat from it, which eventually is hoped to produce commercially available energy. From the article: "Twenty years ago, geologist Gudmundur Omar Friedleifsson had a surprise when he lowered a thermometer down a borehole. 'We melted the thermometer,' he recalls. 'It was set for 380C; but it just melted.'". Excuse me, Gudmundur, but how could that ever have been a 'surprise'..."
There's a host of problems with hydroelectric that rarely get talked about. Damming the river slows the water, reducing the size of sediment it can transport. This causes all the sediment from upstream to settle out at the inlet to the dam resevoir, raising the bed level drastically. Changes in the river like this are detrimental to fish and plats in the river, and have also grounded many boats. This is why very few hydroelectric dams have been built in North America and Europe in the past few decades. For these and a host of ethical reasons (like displacing a couple MILLION people), the Three Gorges Dam should never have been built in China.
I'm not aware of any of these kinds of issues with geothermal (I really do support the idea), but then I don't know that much about the technology. Just pointing out that hydroelectric is far from 'free' when you build dams to do it. The thing is not everyone has something the size of Niagara Falls to generate power from. (Even then , Niagara does not acount for very much of Ontario's total power generation.)