Japan Proposes Ambitious 11,000-Kilometer Solar Ring Around the Moon

Japan is exploring an ambitious space-based solution to its energy challenges. Shimizu Corporation proposes the "Luna Ring," a massive 11,000-kilometer solar panel belt around the Moon's equator. This project aims to deliver clean, constant energy to Earth, addressing growing global demand and terrestrial solar power limitations. It represents a long-term engineering vision supported by the Japan Aerospace Exploration Agency (JAXA).

Japan heavily relies on primary energy imports, accounting for nearly 90% of its needs. Limited land and scarce natural resources make energy transition a critical survival issue. While exploring sources like wave power, Japan seeks more robust and consistent solutions. This drives the focus towards space, where solar radiation is uninterrupted and powerful.

The "Luna Ring" proposal is ingenious in its design. It envisions a continuous belt of photovoltaic cells installed along the Moon's equator. This strategic placement ensures that a portion of the structure always receives direct sunlight, guaranteeing 24/7 energy generation. The generated electricity would then convert into high-density microwaves and laser beams. These would be transmitted directly to receiving stations on Earth.

Global energy demand continues to rise steadily. Terrestrial solar power faces significant limitations, including the day-night cycle, cloud cover, and atmospheric interference. A lunar power plant eliminates these obstacles entirely: it offers continuous solar energy, free from atmospheric filtering or the risk of cloudy skies. This level of consistency is simply impossible to achieve on Earth. The European Space Agency (ESA) already acknowledges the strategic potential of space solar power through its Solaris program.

This project aligns with Japan's vision for a "Hydrogen Society." In this future, hydrogen would replace fossil fuels as the primary energy carrier. The concept of harnessing solar energy in space is not new; aerospace engineer Peter Glaser first proposed it in 1968. Since then, numerous governments and space agencies have investigated this possibility. Shimizu Corporation presents this not as a fixed project with a concrete date, but as a long-term engineering direction to guide its space energy research.