What technology must exist for a space station to rely on magma to generate energy?

This is a fairly simple question with a likely rather complicated answer.

Basically, I worldbuilding a planet that has become a complete wasteland of ash, rock and flowing rivers of magma. The civilization that used to live there has since fled to floating space stations that circle the planet.

My question is: Assuming this civilization uses special mechanical drones to extract magma from the planet and fly it back up to the station, what sort of technology should exist for this to be even remotely plausible? Or, if other methods for energy production far better than this exist, what sort of technology should this civilization have not researched to make magma their best choice?

posted over 6 years ago

doplin‭

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