Space-based solar power would use kilometre-sized solar panel arrays to gather sunlight in orbit. It would then beam power down to Earth in the form of microwaves or a laser, which would be collected in antennas on the ground and then converted to electricity. Unlike solar panels based on the ground, solar power satellites placed in geostationary orbit above the Earth could operate at night and during cloudy conditions.

"We think we can be a catalyst to make this technology advance," said US Marine Corps lieutenant colonel Paul Damphousse of the NSSO at a press conference yesterday in Washington, DC, US.

The NSSO report (pdf) recommends that the US government spend $10 billion over the next 10 years to build a test satellite capable of beaming 10 megawatts of electric power down to Earth.