A massive floating solar farm orbiting in space could soon be reality. Here's how it would work
As Europe struggles through the energy crisis, some scientists are looking to space.
It sounds like the stuff of science fiction but Europe might one day be powered by giant floating solar panels orbiting the Earth.
The European Space Agency (ESA) has unveiled a plan to harvest the sun’s energy in space and beam it back down to Earth.
The technology is still in the preliminary testing phase but the end goal is a 2km long solar space farm, generating as much energy as a nuclear power plant.
The farm would orbit 36,000 km above the Earth.
The ESA is trying to move the project forward at it Minsterial level meeting in Paris today and tomorrow.
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“[Such a project] would ensure that Europe becomes a key player - and potentially leader - in the international race towards scalable clean energy solutions for mitigating climate change,” the ESA said in a statement.
The project, called Space-Based Solar Power, is part of an ESA research and development programme aimed at "new grid balancing and back-up power sources, currently provided mainly by fossil-fuels, hydro and nuclear."
How will the space farm technology work?Solar power is one of the best sources of clean energy, but it’s currently held back by a few limitations. Panels can only harness power in the daytime and, even then, much of the sunlight is absorbed by the atmosphere on its journey to the ground.
In space, the sun’s beams are around ten times as intense as they are on Earth.
The ESA has partnered with Airbus - a European multinational aerospace corporation - to develop ‘wireless power transmission’ to capture this 24-hour source of electricity and beam it down to us.
The technology is based on the transmission used by TV and communication satellites every day, Airbus engineer Nicolas Schneider explains.
"We are not very far from a 4G antenna, except that what we want is not to radiate in all directions, we want to be very precise like a laser, in fact,” he says.
“It’s a wave that can be directed to this receiving antenna which will then transform this wave into electricity."
The problem is scale. The satellite would have to be massive, likely several kilometres across, making them difficult design, build and launch.
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