green and sustainable business

Beam it down, Sol

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The idea of the Solar power satellite is the yin to the yang of the Ronald Reagan’s expensive 1980s Star Wars fantasy, and almost as old. Scientists for decades have explored the potential of using space-based solar cells to beam power to the Earth.

Now the Japan Aerospace Exploration Agency (JAXA) has gone beyond whimsy by actually signing up several major collaborators to launch a giant one-gigawatt space solar power satellite into space. The players are huge – Fujitsu, Mitsubishi Electric and Sharp – and the bucks that JAXA has indicated it will invest in the project are also massive, $21 billion worth.

The plan, according to various recent news reports including London’s Telegraph, is to have the test version of the Space Solar Power System launched in 2020. The final system would go operational in 2030. The station would send down power by laser or microwave.

JAXA would build a mile-wide array of photovoltaic cells similar to the solar panels used on Earth and place them in a geostationary orbit.

The beauty of this idea – even though the complexities and obstacles are admittedly gigantic – is that solar rays are at least five times as powerful in space as they are at ground level, meaning the panels will gather vast amount of energy. In addition the solar arrays can collect energy around the clock regardless of the weather on the ground.

A recent report by researchers at Mitsubishi Heavy Industries said: “Since solar power is a clean and inexhaustible energy source, we believe that this system will be able to help solve the problems of energy shortage and global warming.”

Receiver dishes for the substations would probably be located at sea or in the middle of reservoirs, JAXA says. The ground receiving stations would measure nearly two miles across and would produce enough electricity to power about 500,000 homes.

Tatsuhito Fujita, a JAXA researcher, says that in the next few years “a satellite designed to test the transmission by microwave should be put into low orbit with a Japanese rocket.”

There are technical challenges to overcome, according to a 2008 JAXA report, including the micromave versus laser decision; the development of a low-cost and powerful space transportation system; the design of a lightweight solar power satellite; allocating the frequency for SSPS energy transmission and dealing with concerns, real or imagined, about potential health and environmental effects.

These technical challenges must be met since the SSPS is a viable alternative energy source of the near future,” the JAXA report says.

If it all goes to plan, the electricity produced will be six times cheaper than current energy costs in Japan.

It’s technologically feasible right now and with JAXA’s money and heavy-hitter players enrolled this could turn into the equivalent of the Apollo space project of the 1960s, when the U.S. achieved the goal of landing men on the Moon in less than 10 years. This type of renewable energy space project can and should be done.

Imagine how quickly it could be accomplished if nations — how about the U.S.? — joined Japan in the effort.

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Written by William DiBenedetto

18 November, 2009 at 1:34 pm

Posted in alternative energy, solar

Tagged with , , ,

2 Responses

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  1. The problem with power satellites isn’t designing them or getting the energy down, it’s getting the parts up to GEO.

    “Transporting panels to the solar station 36,000 kilometers above the earth’s surface will be prohibitively costly, so Japan has to figure out a way to slash expenses to make the solar station commercially viable, said Hiroshi Yoshida, Chief Executive Officer of Excalibur KK, a Tokyo-based space and defense-policy consulting company.”These expenses need to be lowered to a hundredth of current estimates,” Yoshida said by phone from Tokyo. http://www.bloomberg.com/apps/news?pid=20601101&sid=aJ529lsdk9HI

    There is at least one way to get the lift cost to GEO down into the sub $100/kg range. Google henson oil drum or ask me for a copy of “Beamed Energy and the Economics of Space Based Solar Energy”, a paper I gave recently at a conference on Beamed Energy Propulsion.


    Keith Henson

    19 November, 2009 at 12:55 pm

    • excellent point, thanks. and i’d like to see your paper.


      19 November, 2009 at 1:29 pm

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