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Solar Energy
Solar Thermal Electricity The United States generates much of its electricity with coal-fired power plants, continuously producing huge amounts of pollution. Those plants need to be closed down. An alternative method for generating electricity is needed, at a scale that can replace those coal plants. The scale is important. Small-scale efforts are not enough to close those coal plants, because of insufficient output combined with market incrementalism creating incentives for waste. What is needed is to build large scale systems that produce more power and introduce large amounts of energy. A group of scientists has written an article in the January 2008 issue of Scientific American magazine proposing large-scale solar energy generation that meets these needs, on land areas including where some of the coal mines and plants are now. The plan would close American coal plants, and create technologically suitable markets for solar energy hardware manufacturers, reducing pressure to impose hardware on less effective sectors. |
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| Electricity will be generated by solar thermal concentrating collectors using reflectors to concentrate the solar energy on heat collectors to generate steam that drives turbines which generate electricity. The electricity will be transmitted with high voltage direct current, which is more efficient than alternating current in long distance transmission. These systems produce much more electricity than photovoltaics, at much lower cost. |
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Energy storage for night-time use can be with
compressed air, as used in
air-power automobiles,
but at a much larger scale, storing the compressed air
in unused underground mines and caverns for later
use to power large-scale
electricity generating power plants at night.
Other types of temporal storage are also possible. Links NREL: Solar Thermal NPR: Science Friday |
![]() Photo: NREL |
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| Thursday, 28-Aug-2008 04:08:42 GMT |