In the global energy transition there are countries and countries. There are some that are more advanced and others that are not so advanced. And although the ease of access to classic fossil fuels works as an anchor to resist change, the fact that you have not been dealt the best cards in terms of natural resources does not help either. Japan is one of those countries where change is almost a matter of survival: little land available, it matters about 90% of its primary energy and if we talk about resources, is testing the wavesbut the wave drive It’s a tough nut to crack.
So Japan has decided to look at the energy transition from a spatial perspective, that is, capturing radiation outside of Earth, where it is more constant and powerful. We already saw it with his Ohisama satellite and now with his Moon Ring for, like says Beyonceput a ring on the moon in the shape of a solar plant.
The idea. The proposal consists of installing a continuous belt of photovoltaic cells along the equator of the Moon covering a circumference of 11,000 kilometers, thus ensuring that a part of the structure is always exposed to direct sunlight, that is, 24/7 energy generation. From there, the electricity is converted into microwaves and high-density laser beams to be sent directly to receiving stations on Earth.
What you propose Shimizu Corporation It is not so much a closed project with a specific date, but a long-term engineering vision to guide its line of research in space energy and this private company is not alone: it has institutional support in the Japanese Aerospace Exploration Agency, which He’s been researching it for decades..
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Why is it important. Because global energy demand continues to grow and terrestrial solar energy has important limitations in the form of the day and night cycle, clouds or the atmosphere itself, which reduce its performance. A plant at the equator of the moon would solve all three in one fell swoop: continuous solar energy, without the atmospheric filter or the risk of a cloudy sky. This is simply impossible on Earth. The European Space Agency has already recognized the strategic potential of space solar energy in your Solaris program.
The eventual materialization of this project represents another step in the “Hydrogen society“, the vision of an economic ecosystem where hydrogen replaces fossil fuels as the main energy vector, arising from Japan’s need to overcome its extreme dependence on energy imports.
In context. The idea is not new by any means: back in 1968 it already occurred to the American aerospace engineer Peter Glaser, who published an article on the subject in Science magazine. Much has happened since then and numerous governments and space agencies have also studied its feasibility: NASA did it in ’79, the British government has been exploring the idea since 2021 and China plans a demonstration in low orbit in 2028 followed by a test in geostationary orbit by 2030. Shimizu takes it a step further: he has moved it from Earth orbit to the moon, which brings certain geometric advantages, but also increases logistical complexity.
In detail. Bring materials from Earth to space It’s not exactly easy or cheap.so their idea is to build the solar panels mainly with resources extracted from the lunar soil itself, using autonomous robots operated remotely. The solar ring would cover the lunar equator with a width of up to four hundred kilometers.
The energy would be transmitted to Earth via a microwave antenna twenty kilometers in diameter, guided by a ground beacon for precise pointing. The concept of wireless power transmission is not science fiction: California Institute of Technology performed in 2023 a demonstration in orbit.
Yes, but. We are facing an engineering project on a scale unprecedented in the history of humanity and the cost of launching cargo into space is the least of the problems (it is being reduced thanks to operators like SpaceX): so would building an infrastructure of these characteristics in situ.
And even if it could be done, cosmic radiation and micrometeorite bombardment on the lunar surface would constitute a serious risk to the integrity of the panels, which implies a challenge in terms of useful life and maintenance. NASA itself points out these barriers in evaluating the space solar energy concept.
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