Slashdot points to an article by Joe Romm, who is considered “one of the world’s leading experts on clean energy, advanced vehicles, energy security, and greenhouse gas mitigation” discussing the merits of solar thermal energy.
Frankly, I have never seen a better article on this and is an eye opener to me.
Mr. Romm understands the issue very clearly because the title of the article is “The technology that will save humanity” and not the other way round of saving the Earth. As Atanu Dey pointed out to me sometime back, it is us; humans; who need saving and not the Earth.
Romm after the excellent start, goes on to explain the constraints of a good carbon free source of energy.
This carbon-free electricity must provide thousands of gigawatts of power and make use of a low-cost fuel that has huge reserves accessible to both industrialized and developing countries. It should not make use of much freshwater or arable land, which are likely to be scarce in a climate-changed world with 3 billion more people.
Solar electric thermal, also known as concentrated solar power (CSP), meets all these criteria. A technology that has the beauty of simplicity, it has proved effective for generations. As the Web site of CSP company Ausra illustrates, solar thermal has a long and fascinating history.
He then goes on to provide a good history of the technology and its use in the last century and the developments in this century.
Since all three remaining presidential candidates endorse a cap on carbon dioxide emissions coupled with a system for trading emissions permits, carbon dioxide will likely have a significant price within a few years. And that means the economics of carbon-free CSP will only get better. Improvements in manufacturing and design, along with the possibility of higher temperature operation, could easily bring the price down to 6 to 8 cents per kilowatt hour.
CSP makes use of the most abundant and free fuel there is, sunlight, and key countries have a vast resource. Solar thermal plants covering the equivalent of a 92-by-92-mile square grid in the Southwest could generate electricity for the entire United States. Mexico has an equally enormous solar resource. China, India, southern Europe, North Africa, the Middle East and Australia also have huge resources.
Solar has the biggest potential of all and looks like thermal electricity is better than PV.