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Shimizu Corporation plans to construct the Luna Ring, a solar power plant on the Moon measuring 11,000 km in length and 400 km in width. The project exploits the Moon's lack of atmosphere for constant solar energy collection, proposing to use lunar materials for construction.

Initial equipment would be sent to the Moon, where robots and astronauts would build excavators and solar panels from local resources. This lunar facility would transmit energy back to Earth using lasers and microwaves. The construction is projected to take two generations, coinciding with the establishment of a human colony on the Moon.