Source: TYLER HAMILTON/TORONTO STAR
Selections from the article:
It sounds like something out of a sci-fi novel. Solar power plants orbiting the planet, each the size of 700 Canadian football fields, beaming clean energy down to Earth 24 hours a day so we can run our factories, charge our gadgets and keep our home appliances humming.
But for the scientists and engineers attending the International Symposium on Solar Energy from Space, a three-day conference this week in Toronto, there's nothing fictional about it. In their view, building massive space-based solar power systems represents, over the long term, one of the most effective ways of tackling the double menace of global warming and peak oil.
Scientists say the advantage of putting a solar station in space is that it would face the sun 24 hours a day and would not be limited by cloud cover or air pollution. That would allow it to continuously generate power in the same manner as nuclear and fossil-fuel plants, but without the associated waste and greenhouse-gas emissions.
The idea has been around for 40 years, attracting serious attention from NASA and the U.S. Department of Defense during the 1970s, but funding eventually dried up. It wasn't until the late 1990s that interest in the concept resurfaced, partly as a result of concerns related to global warming and energy security.
Two years ago, the Pentagon's National Security Space Office issued a report that concluded solar-based power "is more technically executable than ever before."
Former NASA executive John Mankins, now president of the Space Power Association, said he believes space-based solar power could be economically competitive with other options.
Mankins added that he believes a small 10-megawatt demonstration plan could be in orbit within the next 10 years. "It's a reasonable time frame," he said.
At the conference, Nobuyuki Kaya, vice-dean of graduate engineering at Kobe University in Japan, demonstrated how the power could be transmitted wirelessly. Assisted by a team of students, he was able to light up a cluster of red LED lights and power a simple robot by beaming energy about 10 metres across a room.
Kieran Carroll, chief technology officer for Space Canada, which is hosting the conference, said such a system could be safely designed to accept and convert large amounts of energy from space. The trick is to transmit at low intensity by sending it down on a wide beam, about 10 kilometres across.
There would have to be no-fly zones around the area, but it wouldn't fry anyone walking through it.
"The power flux density in the middle of the (receiving) field would be perfectly safe for any life," said Carroll.
"In Canada, on a winter's day, one of the big problems would be that birds would probably hover over the field to get warm."
A reality check, however, came from power developer Wael Almazeedi, who warned of the legal, financial and regulatory challenges the plan would face, as well as the difficulty of "promoting a concept based on science fiction."
"Experts meet to discuss feasibility of harvesting solar power in space, beaming it back to Earth"
09 September 2009
The Toronto Star
Link: Article from The Star
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