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No—not as a current Japanese construction project. The 6,800-mile lunar solar ring is LUNA RING, a long-range energy concept proposed by Japanese engineering and construction company Shimizu Corporation. It envisions solar cells circling the Moon’s equator, with electricity sent to Earth by microwave or laser beams.
The concept is genuine, but the available source material does not establish a government-backed program, construction contract, budget, launch schedule, or operating date. “Powering Earth 24/7” describes the proposal’s ambition—not a demonstrated capability.
What is the LUNA RING?
LUNA RING is a proposed lunar power station built around the Moon’s equator. Shimizu’s concept calls for a solar-cell belt approximately 11,000 kilometres long—about 6,835 miles, usually rounded to 6,800 miles. The proposed belt would not necessarily be a narrow, uniform strip: Shimizu describes sections ranging from several kilometres to as much as 400 kilometres wide.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Solar panels would generate electricity on the Moon’s sunlit surface. Cables running along the lunar ground would carry that electricity to a transmission facility on the side of the Moon facing Earth. The power would then be converted into microwave and/or laser beams and sent to large receiving stations on Earth.
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The idea dates back at least to a 2009–2010 technical proposal published through the Japan Society of Mechanical Engineers’ conference proceedings. It is therefore not evidence of a newly approved lunar construction program.
Is Japan actually building the solar ring?
The careful answer is no—not according to the available primary material. Shimizu presents LUNA RING as a proposal and future energy vision. The material does not announce a funded build, a government adoption decision, a launch timetable, completed hardware, or an operational target.
That distinction matters:
- Established: Shimizu Corporation proposed the LUNA RING concept.
- Not established: Japan’s government has adopted it as a national project.
- Not established: Construction has started.
- Not established: A budget, construction contract, feasibility approval, or launch date exists.
Recent fact-checking coverage has likewise identified the viral claim as a description of a Shimizu corporate concept rather than an official Japanese government project. DigitEye’s fact check is useful context, but Shimizu’s own description and the original technical record are the stronger sources.
How could it provide power around the clock?
The “24/7” claim does not mean that every lunar solar panel would always be illuminated. The proposed operating principle is to distribute solar generation around a very large belt and move electricity across the lunar surface.
- Sunlight reaches solar cells on the Moon’s illuminated side.
- The cells produce electricity.
- Cables carry electricity toward an Earth-facing transmission base.
- The base converts the electricity into microwave or laser energy.
- Earth-based receiving stations capture the beam and convert it back into electricity—or potentially use it to produce hydrogen.
Because the Moon has no weather in the terrestrial sense, the generation site would avoid clouds, rain, and storms. But continuous delivery would still require storage, redundant equipment, or backup generation. A lunar eclipse temporarily blocks sunlight, and the available concept description does not provide a complete calculation for eclipse storage, reliability, or delivered power.
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So 24-hour generation is a design objective proposed by Shimizu, not a proven operating result.
What would have to be built first?
The project would require a complete industrial ecosystem on the Moon—not merely a shipment of solar panels. Shimizu’s vision includes remotely operated construction robots, mobile manufacturing plants, lunar transport routes, cables, transmission equipment, and Earth-based receiving infrastructure. Humans would still be expected to work alongside the robots.
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The required systems could include:
- Heavy lunar landing and cargo-delivery vehicles.
- Excavation, mining, and material-processing robots.
- Factories for glass, ceramics, concrete, oxygen, water, and solar-cell components.
- Long-distance power cables and high-voltage equipment.
- Roads or transport corridors across the lunar surface.
- Microwave and laser transmitters, including a proposed microwave antenna described as 20 kilometres in diameter.
- Large rectennas or other receiving facilities on Earth.
- Communications, navigation, beam-control, repair, and emergency-shutdown systems.
Could lunar soil be used to make solar panels?
Using lunar resources is central to the concept because transporting every structural component from Earth would be impractical. Shimizu proposes using lunar material to make products such as glass, ceramics, concrete, oxygen, water, and solar-cell or solar-cell-related materials.
However, these are not equivalent achievements. Producing bulk construction material is much simpler than manufacturing reliable photovoltaic cells with the purity, precision, electrical properties, and quality control required for long-term power generation. The proposal is therefore a resource-utilization pathway, not evidence that a lunar factory has already produced working solar panels.
The biggest engineering obstacles
Unprecedented construction scale
An 11,000-kilometre installation would be vastly larger than any extraterrestrial industrial project attempted so far. Builders would need to coordinate excavation, manufacturing, transportation, electrical interconnection, dust control, thermal management, and maintenance over a huge area.
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Lunar dust and harsh conditions
Lunar dust is abrasive and electrostatically mobile. It can threaten seals, moving machinery, optical systems, and solar surfaces. Equipment would also face vacuum, radiation, micrometeorite impacts, and extreme temperature cycling.
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The proposed cables would have to survive radiation, vacuum, thermal expansion and contraction, dust contamination, impacts, and mechanical damage. A practical system might need segmented networks, bypass routes, and robots capable of locating and repairing failures.
Manufacturing and autonomy
The concept depends on reliable mining, refining, manufacturing, quality control, communications, and autonomous repair. A communications failure or robotic-control problem could leave major sections idle unless local systems could safely enter a self-contained operating mode.
Beam pointing and safety
Microwave or laser energy would have to be directed across the Earth–Moon distance with exceptional accuracy. Shimizu describes a guide-beacon approach, but a complete operational safety case is not provided.
A real system would need authenticated commands, independent position checks, redundant tracking, automatic shutdown, protected receiving zones, and procedures for aircraft, spacecraft, satellites, and unexpected objects. Cybersecurity would be essential because malicious redirection could create serious hazards.
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Conversion losses
The power collected by the lunar cells would not equal the electricity delivered to consumers. Losses would occur during solar conversion, cable transmission, conversion into microwaves or lasers, transmission through space, reception, rectification, grid conversion, and terrestrial distribution.
What about lunar eclipses and the Moon’s changing position?
A lunar eclipse can interrupt sunlight reaching parts of the installation. Possible mitigations include oversized generation capacity, lunar storage, hydrogen production and reconversion, terrestrial backup, or multiple energy sources. The available LUNA RING material does not specify the storage capacity or reliability model needed to guarantee uninterrupted supply.
The Moon’s geometry also complicates delivery. The Moon is not fixed above one Earth location, and a single Earth-facing lunar transmitter would not serve every region equally. Receiving stations would need carefully selected locations, changing beam geometry, terrestrial transmission lines, and weather-aware operations. Microwaves and lasers would have different atmospheric and safety constraints.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much power could it produce?
Earlier media reports and later summaries often repeat an eventual output of approximately 13,000 terawatts. That number should be treated as a conceptual estimate attributed to earlier descriptions—not as an independently validated production forecast.
It is also important to distinguish theoretical generation from useful electricity. The meaningful figure for consumers would be reliable power received on Earth after conversion and transmission losses, backed by a cost, maintenance, storage, safety, and grid-integration model. The currently available overview does not establish those figures.
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Would LUNA RING be economical?
There is no reliable current cost estimate in the primary concept material. The economic challenge would include developing lunar launch and landing systems, mining and manufacturing infrastructure, autonomous construction, Earth receiving stations, maintenance logistics, replacement parts, financing, governance, and decades of technological development.
Earlier coverage also noted the lack of a concrete total-cost estimate. That makes it impossible to claim that LUNA RING would be cheaper than terrestrial solar, batteries, nuclear power, or orbital space-based solar power.
For the foreseeable future, terrestrial systems have major practical advantages: established supply chains, accessible maintenance, easier upgrades, and integration with solar, wind, storage, hydroelectricity, geothermal power, nuclear generation, and long-distance transmission.
LUNA RING compared with other clean-energy approaches
| Approach | Main advantage | Main challenge |
|---|---|---|
| LUNA RING | Potentially large-scale solar generation without terrestrial weather at the generation site | Requires a vast lunar industrial base, wireless transmission, and unprecedented maintenance |
| Terrestrial solar and storage | Existing manufacturing, deployment, and repair infrastructure | Weather, land use, transmission, and storage requirements |
| Orbital solar power | Avoids lunar surface construction | Large spacecraft, orbital assembly, station-keeping, and wireless transmission |
| Nuclear power | High capacity factor from compact terrestrial sites | Cost, fuel, waste, safety, and political challenges |
Bottom line
LUNA RING is a real Japanese engineering concept, but it is not currently established as a funded Japanese construction project. The 6,800-mile figure is a rounded conversion of Shimizu’s proposed 11,000-kilometre lunar-equatorial belt. Its promise of 24/7 power depends on technologies and infrastructure that have not been demonstrated at anything close to the required scale.
The idea is useful as a vision of lunar industry and space-based energy. It should not be reported as proof that Japan is about to build a solar ring—or that the Moon will soon power Earth.
Further reading: WIRED’s historical coverage and Philippine News Agency’s discussion document how the output figures have circulated, while TechRadar Pro provides additional historical and economic context.
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