From what I've seen on the media, Mongolia is bitcoin friendly and there's availability of cheap electricity, especially in the town called Ordos, and many miners are already taking advantage of this.
Ordos is in China.
Inner Mongolia is a province of China and not of Mongolia the country!
1. very obvious advantages, why there are not many farms there?
Cheap energy doesn't mean that's the real cost, the 2cents/kwh is the subsidized government price, and you might not get your licenses to benefit from that accepted or prolonged.
The grid is split in 3 parts and it's not that reliable, one part is just tiny and one is heavenly dependent on Russian imports.
Cheap energy also doesn't mean abundant energy, in the best case scenario
the entire energy produced in the country would feed around 200k miners, that's less than 7% of the total hashrate right now, now think how much they have to spare.