Solar Balloons to Harvest Sun’s Energy Above the Clouds

solar sky balloon farm

Optimized solar panels can only take energy capture so far, which is one of the reasons this company is trying to take power-harvesting airborne with a fleet of solar-gathering balloons. A solar sky form, says NextPV, could even move with the sun, producing clean energy around the clock (not by moving against the planet’s rotation, but perhaps someday – more below).

solar sky farming concept

The technologies in use for weather balloons and other similar aerial endeavors is already partially in place, but the means of moving the balloons and transmitting energy back down to Earth are still being researched and developed. The current plan is to turn sunlight to electricity and produce hydrogen for use as above-the-ground fuel cells, engaging in the conversion processes at night. The group has teamed up with academics and researchers to solve the next steps of the problem, and optimize the system for efficiency and practicality.

“Anywhere above the planet, there are very few clouds at an altitude of 6 km (3.7 miles)—and none at all at 20 km (12.4 miles),” says Jean-François Guillemoles. “At those heights, the light comes directly from the Sun, as there are no shadows and hardly any diffusion by the atmosphere. As the sky loses its blue color, direct illumination becomes more intense: the concentration of solar energy results in more effective conversion, and hence higher yields.”

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See more in Energy & Power or under Science. March, 2016.