Practicality of harnessing geomagnetic fields for electrical generation?

Question

Years ago I would have asked this on the 'Overflows. Alas, those innocent days are long gone. I could always ask AI, but how can you know?The Earth produces a moving magnetic field (small teslas, but large extent yes?). Moving magnetic fields produce electrical current, right? Could you add "geomagnetic power" to other clean/renewable sources with the right technical solution, or is it fundamentally impossible?

sloaken · Accepted Answer

This seems like a very obvious solution. But of course I am ignorant on electricity generation and or the physics involved. I am hopeful someone will enlighten us.

gcheong · Answer

It's been done, but the amount generated was very small and it's not clear it could be scaled up to any useful amounts.https://spectrum.ieee.org/earths-magnetic-field