Why are thermo-electric generators most often used in remote locations?

Answer 1

Because of the difficulties in getting traditional sources of power to these locations.
Just think of the expense and trouble of running and maintaining power lines up the side of a mountain,or trucking in fuel oil or coal on a regular basis.
A thermo-electric generator need only be set up once,and it keeps puttin' out the juice.

Answer 2

Thermoelectric generatore are used on deep-space probes (satellites) for 2 reasons:

1. solar cells wouldn't provide enough power at great distances (past the orbit of Mars)

2. They don't make extension cords long enough to go into interplanetary space.

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Answer 3

No moving parts, extremely reliable for hard to get to locations.