Japan’s "Luna Ring": The 11,000-Kilometer Solar Belt That Could Power Earth

Imagine looking up at a full moon and knowing that a thin, shimmering line across its equator is keeping your lights on and your EV charged. It sounds like the plot of a high-budget sci-fi flick, but for engineers at Japan’s Shimizu Corporation, it’s a serious proposal. They’re calling it the "Luna Ring," and it might just be the most ambitious infrastructure project in human history.

A Belt of Infinite Sunshine

The concept is deceptively simple: build a continuous 11,000-kilometer band of solar panels around the Moon’s equator. Because the Moon has no atmosphere and doesn't experience "weather" in the way Earth does, these panels would be bathed in constant, intense sunlight.

Construction wouldn't involve shipping millions of panels from Earth—that would be impossibly expensive. Instead, Shimizu suggests using lunar resources. Robots would mine moon dust (regolith) to produce the concrete, ceramics, and glass needed for the array. Once completed, this 400-kilometer-wide belt would act as a massive, permanent power plant that never sleeps.

Beaming Power Across the Void

Generating the power is one thing; getting it back to Earth is the real trick. The Luna Ring would convert the captured solar energy into microwaves or high-density laser beams. These beams would be aimed at massive "rectennas" (rectifying antennas) located on Earth, likely in the ocean or remote deserts, where they would be converted back into electricity and fed into the grid.

While the tech for wireless power transmission exists on a small scale, doing it across 384,400 kilometers of space is a logistical Everest. There are also valid concerns about "misplaced" beams and the sheer cost of maintaining a robotic workforce on the lunar surface.

Is it Science Fiction or Our Future?

Currently, the Luna Ring remains a proposal without a set budget or a government green light. Critics point to the astronomical costs and the lack of current technology to build at this scale. However, as terrestrial land for solar farms becomes scarce and our energy needs skyrocket, space-based solutions are moving from the "crazy" pile to the "necessary" one. Whether it starts in 2035 or 2135, the Moon might just be our ultimate gas station in the sky.

Sources

• Japan wants to build an 11,000-kilometer solar ring around the Moon
• Japan plans giant 11,000-km solar ring around the Moon to send limitless energy to Earth
• Japan wants to put a solar ring around the Moon to power Earth

Sources

• https://www.ecoticias.com/en/japan-wants-to-build-an-11000-kilometer-solar-ring-around-the-moon-and-beam-clean-energy-back-to-earth-an-idea-that-sounds-impossible-until-engineers-explain-the-plan/31964/
• https://economictimes.indiatimes.com/news/new-updates/japan-plans-giant-11000-km-solar-ring-around-the-moon-to-send-limitless-energy-to-earth-how-futuristic-project-would-work/articleshow/131035762.cms
• https://geekspin.co/japan-solar-ring-around-moon-to-power-earth/