Gallery: 6 Out of This World Space-Based Solar Power Designs

 

The SunTower

The SunTower is a supertall gravity stabilized structure that uses inflatable circular solar concentrators, multi-junction solar cells and magnetron segments to transmit the suns energy down to earth. In laymen terms, it is similar in design to a sunflower, with the flower facing the Earth and sending the energy down the stem using microwaves. The predicted cost – before any energy has been produced – of one SunTower is estimated at $12 billion. Though the SunTower is an interesting concept, it soon became clear that the approach could only deliver power to a given ground station for a few minutes a day.

SPS-ALPHA

This margarita glass-shaped space setup is nicknamed, SPS-ALPHA – which is short for Solar Power Satellite via Arbitrarily Large PHased Array. It consists of a large array of thin-film mirrors attached to the curved surface of a massive satellite. These mirrors are moveable and will be used to redirect incoming Sunlight towards the solar cells that are fixed on the backside of the device. A collection of microwave power transmission panels is placed on the Earth-side of the array, which enables the transportation of the electricity generated by the solar cells to earth in the form of radio waves.

John Mankins, the leader of the concept says: “The needed next steps are to develop a working prototype of one or more of the modules and demonstrate the assembled system in the field. Over the next several years, the goal is to realize a low-Earth orbit flight test of the system.”

Image credit: JAXA

JAXA’s SBSP System

Japan Aerospace Exploration Agency (JAXA) is aiming to launch their space-based solar power prototype by 2020, with plans to set up a full system in space by 2030. JAXA`s SBSP system is a satellite designed to run in stationary orbit 22,400 miles above the equator, where it will absorb sunlight with chromium-enhanced solar cells. Neodymium plates fixed on the satellite’s surface will zap the energy down to Earth by using laser beams with 42% solar-to-laser energy efficiency. Current estimations predict that a single solar SBSP satellite in space would be able to generate enough energy to power 500,000 homes.

The Dyson–Harrop Satellite

Even though The Dyson–Harrop Satellite is technically not a space-based photovoltaic power design, it does harness the sun’s energy for the good of the planet. This satellite is in really a giant “sail” – 8,400 kilometers (5,220 miles) wide – designed to harness solar winds. The sail generates a magnetic field by pointing copper wires at the sun. This field is capable of capturing the electrons found in solar winds, which in turn are funneled into a spherical receiver that produces a current (a fundamentally different approach than photovoltaic solar panels). The plan is to send this energy back to Earth with powerful infrared laser beams. The total potential for harnessing solar winds is 1 billion gigawatts of electricity, so figuring out how to tap into this energy source could be a revolutionary step for mankind.

Image credit: NASA artwork by Pat Rawlings/SAIC.

The SunTower

The SunTower is a supertall gravity stabilized structure that uses inflatable circular solar concentrators, multi-junction solar cells and magnetron segments to transmit the sun’s energy down to earth. In laymen terms, it is similar in design to a sunflower, with the flower facing the Earth and sending the energy down the stem using microwaves. The predicted cost – before any energy has been produced – of one SunTower is estimated at $12 billion. Though the SunTower is an interesting concept, it soon became clear that the approach could only deliver power to a given ground station for a few minutes a day.

Image credit: Space Future

The SolarDisc

This SBSP concept involves an axisymmetric, modular space segment that extends in geostationary Earth orbit. It is covered with high-efficiency thin-film solar cells. One SolarDisc along with its ground component could be scaled to produce as much as 10 GW of energy.

The European Sail Tower SPS

The European Sail-Tower SPS (short for Solar Power Satellite) is a large tower-like orbital system that is similar to the Sun tower. The satellite deploys rectangular solar panels from sail-like structures that line the sides of the tower. The satellite stays in orbit and generates electricity that is transmitted back to Earth via microwaves. This design was developed in the late 90s, although there hasn’t been much activity in the last couple of years.

Peter Sage of Space Energy Inc., said the following in his space energy presentation at TED: “The challenge has never been technology, but economics [...] We have the technology to convert electricity into a transferable radio frequency, send it back down to Earth with pinpoint accuracy safely and reliably to create constant energy generated by the Sun 24 hours a day”

SBSP is the holy grail of renewable energy. These systems have the potential to supply the entire Earth with clean, base-load electricity. A coordinated effort from China, India, Japan, EU and United States, both in terms of funding and research collaboration, could bring us closer to making science fiction become reality.

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3 Comments

  1. BobboMax October 14, 2012 at 6:57 pm

    @ dclark13- It’s best to avoid technical comments if you’re not technically competent.

    The issue isn’t frequency but power density. Radio waves which are long enough to pass through most things will do just that, which makes it very difficult to harvest energy from them. Crystal radios aside, radio receivers only work because they use the radio wave as a signal, not a power source and rely on amplification to produce useful amounts of power.

    To transmit useful amounts of power requires high power density and a wavelength short enough for the receiving antenna to be of a practical size. Once you get into that regime, many objects qualify as receivers and potential toast. Think of life in a microwave oven.

    And you’re right, this has all been proven possible and plausible by ACTUAL PROFESSIONAL SCIENTISTS! They just haven’t discussed some of the possible downsides.

  2. dclark13 October 13, 2012 at 6:25 pm

    To BobboMax:

    Although it sounds like science fiction, this has all been proven possible and plausible by ACTUAL PROFESSIONAL SCIENTISTS! Not to mention, even if a terrorist agency somehow got their hands on the aiming device for it (assuming there is one), and aimed it at a city… NOTHING WOULD HAPPEN!

    It’s analogous to the radio waves picked up by your radio, they go right through people and objects without harming or affecting them at all. The reason for this has to do with the frequency of the radio waves, so even if you focused them and made them more powerful to provide energy, it still wouldn’t damage anything. So thank you for the concern, but this isn’t going to hurt us.

  3. BobboMax September 22, 2012 at 1:20 am

    ” zap the energy down to Earth by using laser beams ”
    “convert electricity into a transferable radio frequency, send it back down to Earth with pinpoint accuracy ”
    “send this energy back to Earth with powerful infrared laser beams.”
    “the transportation of the electricity generated by the solar cells to earth in the form of radio waves.”

    Does anyone else think these sound like Dr. Strangelove’s wet dreams? Even if you genuinely trusted all the governments and corporations involved in focusing these energy beams on our only inhabitable planet, do you trust the computers and technicians who’ll be doing the focusing?

    “Where stupidity is sufficient explanation, one rarely need seek further.”

    And never mind Dr. Strangelove- he was fiction. What about al Queda? And Mossad? And our own beloved CIA- it used to be a civilian organization, but now it’s run by a general named Petraeus.

    And remember Bhopal? (http://en.wikipedia.org/wiki/Bhopal_disaster ) Eight Union Carbide employees were convicted, but never went to prison. There was an average payment to the families of the dead of $2,200. Estimates of deaths range from 3,000 to 30,000, with permanent injury estimates ranging from 100,000 to 200,000. Just another industrial accident. The only bad part was some people had to take the fall. With SBSP, you could blame it all on a computer.

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