As I understand they mean that a thermoelectric generator is much more useful in small scales of size and weight, where it can't operate very efficiently.
It's primary application being for spacecraft since it can have a decent power output for a very long time, which is what's typically required from a long standing mission.
It's primary application being for spacecraft since it can have a decent power output for a very long time, which is what's typically required from a long standing mission.