February 11, 2008

Japan taking small steps to 1 gigawatt space based solar power by 2030

Japan Aerospace Exploration Agency (JAXA) have begun to develop the hardware for deploying a 1 gigawatt space based solar power system by 2030. These we will small lab tests.

JAXA, which plans to have a Space Solar Power System (SSPS) up and running by 2030, envisions a system consisting of giant solar collectors in geostationary orbit 36,000 kilometers above the Earth’s surface. The satellites convert sunlight into powerful microwave (or laser) beams that are aimed at receiving stations on Earth, where they are converted into electricity.

The researchers will use a 2.4-meter-diameter transmission antenna to send a microwave beam over 50 meters to a rectenna (rectifying antenna) that converts the microwave energy into electricity and powers a household heater

JAXA ultimately aims to build ground receiving stations that measure about 3 kilometers across and that can produce 1 gigawatt (1 million kilowatts) of electricity — enough to power approximately 500,000 homes.

Low earth orbit spaced based solar power could be more easily scaled

Space Island Group has almost completed financing for a prototype 10-25 megawatt system that it claims will be in orbit within 18 months, at a total cost of $200 million.

"It will 'site-hop' across base stations in Europe, beaming 90 minutes of power to each one by microwave." If the test proves successful, a 1 gigawatt installation for the UK domestic market would be the next step.


Anonymous said...

Hi. The pic attached to your 'solar array' post has nothing to do with the subject. It is a traditional offset fed C band parabolic.

qraal said...

Hi Brian

JAXA has talked BIG before but their plans usually end up getting gutted by Japan's Budgetary Authority. SPS is a vital step for Japan, but to be really effective it needs to happen sooner. Messing about with antennae is all very well, but there's a long way to go to get to 1 GW. Smaller demosats might be a better way to test microwave power transfer.

bw said...

Anonymous, it was the photo from the japanese source article.

Qraal: I recognize that this is a long shot, which is why I mentioned small steps in the title. I think the low earth orbit approach seems like a better way to go. If Japan is going to make SPS then I think the direct to laser power transmission that they are working on is better

Snake Oil Baron said...

Good day,

Has there been any work to demonstrate the technology needed to send large amounts of energy through a comparable distance of atmosphere? Is that part just a given or has it already been demonstrated? For some reason it rings a bell but I can't remember if or where I heard of it being tried.