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MIT-Led Study Says Geothermal Energy Is Viable
amigoro writes to tell us about a study for the US Department of Energy, led by MIT, indicating that geothermal energy could account for 10% of energy production in the US by 2050. The study concludes that geothermal is proven, could impose markedly lower environmental impacts than fossil-fuel and nuclear power plants, and is likely to be cost-competitive with the alternatives. This coverage in LiveScience points out how big a player geothermal already is in the US: "The United States is the world's biggest producer of geothermal energy. Nafi Toksöz, a geophysicist at MIT, noted that the electricity produced annually by geothermal plants now in use in California, Hawaii, Utah, and Nevada is comparable to that produced by solar and wind power combined."
*Modern* nuclear power plants are the best solution to our coal and oil dependence.
I like how the summary states that geothermal energy generation is cost-competitive with straw men like solar power, and lumps nuclear power plant environmental impact with the other straw man, fossil fuels.
I may make you feel, but I can't make you think.
I'm fairly comfortable that we've got a long way to go to screw up the earths core temperature and/or magnetism (that's not based on any scientific knowledge, btw). It seems, however, that we could much more quickly screw up ocean currents by changing the thermal gradients that exist (again, not based on hard science numbers). Since much of our weather patterns are based on those ocean currents, I would venture that a real effort to convert to using ocean thermals to satify a larger portion of humaities need for energy could very well alter the global weather in just a few generations. Maybe the numbers don't support my gut feeling, but I would need to be convinved otherwise before I considered using ocean gradients for power.
(and yes - using the gradients means reducing said gradients - it's that whole "laws of thermodynamics" thing Homer keeps reminding Lisa about)
Is it just my observation, or are there way too many stupid people in the world?
I visited Iceland a couple years ago, and I became sold on geothermal. I mean, Iceland is a small country, but they have fairly high power needs per capita because of the cold climate, and they run almost entirely off geothermal, as I understand it. This isn't some apologetic green technology that is decades or more from delivering affordable massive power, like solar, wind, etc. No, this is the real thing: a geothermal plant puts out power at nuclear reactor levels. And these things are clean.
My favorite part of the visit was swimming in the Blue Lagoon... a spa built alongside the runoff from a geothermal power plant. Seriously: you're in the middle of a lava rock field, and boiling hot waste water pours from the power plant into a huge outdoor pool. In the cold air you can nearly cook yourself as you swim closer to the power plant. But it's clean enough to swim in.
There are many criteria that need to be met to build a geothermal power station at a given location, but I think the research and development needed must be far less than for some other technologies, and the end result is completely proven, so the risks are minimal.
My ideal-yet-realistic world features geothermal and nuclear supplementing each other, with the preference towards geothermal.
Cheers.
I have no problem having a nuclear power plant in my "backyard", and would be more then happy if it was a fast breeder reactor that could continually burn it's fuel (as to have very little waste). If you want to get (cheap, less-polluting energy) you have to give (having production close by, being rational with regards to generation method).
Most people don't get that a coal-fired electical generation facility puts out more radiation then a nuclear power plant. Go figure.
The problem is that most of the designs for geothermal is to use the prevailing heat as a wet well. That is they want to not only use the heat, but the local water. If they had a recycling GT set-up, then there would be a whole lot less impact and fight. But of course, that means spending some real money. A good example was the one in Wyoming next to YellowStone. Some far right wing group set up there and built one that used the water. Funny enough they simply discarded the water rather than re-inject (too much money). Needless to say, nearby springs and gysers lost their pressure. So a court injunction was obtained and they were stopped. Once a recycling GT can be built cheap, and effectively, you will see GT springing up all over here.
I prefer the "u" in honour as it seems to be missing these days.
Yep, there are several plants in California. The twenty-odd plants that make up the Gysers north of Santa Rosa in the Bay Area, and I understand another field in the Imperial Valley. The Gysers field has been drying up over the years, despite them trying to pump water back down into it, and I haven't really checked the status of it in years.
As much as this is an interesting technology, it's not perfect. The geothermal steam that goes through the plant is also loaded with sulfur and arsenic, which all has to be scrubbed out before the steam can be released through the air. The amount of solid sulfur removed per day was quite a bit.
Another thing to keep in mind, that this Reuters article covering the same thing mentions that there are 61 projects in the works for 5000+ megawatts. For comparison, Diablo Canyon nuclear plant has two reactors, and each can produce over 1100+ megawatts. There is way more bang for the buck in other technologies, but they all have their drawbacks.