A lunar solar power generation concept developed by the Japanese Shimizu Corporation that attempts to turn the moon into a giant solar power plant. Using robots supervised by humans, the concept proposes the building of a massive collection of solar panels called the "Luna Ring", stretching 6,800 miles (11,000 km) long by 12 miles (20 km) wide on the moon's surface.

Once completed, this hypothetical plant could continuously send energy to receiving stations on earth by way of lasers and microwave transmission. Using the moon to generate solar powers removes two major hurdles for solar power generation on earth, as there is no weather or darkness to curb electricity production on the moon. If implemented, the Luna Ring can potentially provide the ultimate source of unlimited use of clean energy for mankind.

The construction of the Luna Ring consists of the following six key engineering components:

1. Lunar solar cells: To ensure continuous generation of power, an array of solar cells will extend like a belt along the entire 11,000km lunar equator. This belt will grow in width from a few kilometers to 400km.
2. Electric power cables: The cables will transfer the electric power from the lunar solar cells to the transmission facilities.
3. Microwave power transmission antennas: The 20km-diameter antennas will transmit power to the receiving rectennas. A guidance beacon (radio beacon) brought from the Earth will be used to ensure accurate transmission.
4. Laser power transmission facilities: High-energy-density laser will be beamed to the receiving facilities. A guidance beacon (radio beacon) brought from the Earth will be used to ensure accurate transmission.
5. Transportation route along the lunar equator: Materials needed for the construction and maintenance of the Solar Belt will be transported along this route. Electric power cables will be installed under the transportation route.
6. Solar cell production plants: The plants will move automatically while producing solar cells from lunar resources and installing them.