The idea of collecting solar energy in space has evolved from science fiction into a serious engineering concept. More than a decade ago, Japan’s Shimizu Corporation unveiled plans for the Luna Ring, a continuous band of solar panels encircling the Moon’s equator.
The proposed structure would stretch about 6,800 miles, enabling it to capture sunlight without interruption. Although the concept initially attracted limited attention, interest grew after the Fukushima Daiichi nuclear disaster in March 2011.
Space-Based Solar Power Could Deliver Continuous Energy
According to Shimizu Corporation, solar panels in space could produce about 20 times more energy than comparable systems on Earth. With no atmosphere to absorb or scatter sunlight, and half of the ring always facing the Sun, the system could generate electricity around the clock.
Unlike Earth-based solar farms, which stop generating power at night and lose efficiency in cloudy conditions, the Luna Ring operates in space to avoid these limitations.
The transmission process involves several stages:
- Collection: Solar panels installed along the Moon’s equator capture sunlight and convert it into electricity.
- Transmission: Underground cables transport the electricity to the Moon’s near side, which always faces Earth.
- Beaming: Large transmission stations transform the electricity into microwave beams and high-power laser signals.
- Reception: On Earth, specialized receiving antennas known as rectennas capture the transmitted energy and convert it into electricity for the power grid.
Shimizu’s plans also envision using the transmitted energy to produce hydrogen fuel on Earth. The project’s long-term goal is to replace fossil fuels with a hydrogen-based energy economy.
Solar panels along the Moon’s equator would convert sunlight into electricity and send the power through cables to transmission points. Microwave signals and lasers would send the energy to receiving stations on Earth.
Constructing such a large-scale system on the lunar surface would involve major logistical difficulties. To reduce risks to humans, Shimizu proposes relying mainly on automated machines, with Earth-based operators controlling the robots continuously. A small number of astronauts would remain on the Moon to provide technical and mechanical assistance when needed.
Using Lunar Resources to Reduce Construction Costs
The project would depend heavily on using lunar resources to lower the enormous cost of shipping materials from Earth. Oxide-rich materials in lunar soil, known as regolith, could combine with imported hydrogen to produce water and oxygen directly on the Moon.
The processed lunar material could also be used to create construction materials such as concrete, ceramics, glass fibers, and even basic solar cells. Mobile automated factories would travel around the lunar equator, producing and installing solar panels as they advance. The completed solar belt could reach widths of up to 249 meters in some areas.
Despite the strong scientific foundation behind space-based solar power, the Luna Ring concept still faces significant economic and technical challenges. Energy analysts say lunar solar power is theoretically possible, but costs remain uncertain and key technologies are still experimental.
A key challenge is the transmission of gigawatts of energy across approximately 238,000 miles of space. Microwave and laser-based systems would require highly precise aiming and coordinated guidance beacons on Earth to safely direct the energy beams. Such large-scale wireless power transmission has never been demonstrated.
Scaling Existing Technologies for a Massive Space Project
According to Shimizu, the basic elements needed for the project already exist: sunlight is an unlimited resource, photovoltaic systems are well developed, and microwave power transmission has been extensively studied. The main difficulty is scaling these technologies to a size far beyond any infrastructure project ever attempted.
The Luna Ring remains a conceptual “Dream Project” in Shimizu Corporation’s official portfolio. The company has no financial backing or official support from space agencies like JAXA or NASA.
The proposal gained some attention in public discussions after the 2011 earthquake and tsunami caused the shutdown of a significant portion of Japan’s nuclear power capacity. Although interest in alternative energy solutions increased at the time, no government funding was allocated to advance the Luna Ring.
Currently, the project team continues conducting long-term research based on established physical principles. Engineers argue that future advances in space transportation and related technologies could eventually make the ambitious concept achievable.
Read the original article on: futura
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