The spring will be an interesting time for sure. I hope FC and AM build a decent size self mine with their cheap power in China.
AMHash takes 47$/Ths/month (0.8W/Ghs) = 0.08 USD/kwh - is it a cheap power?
You have to figure maintenance, internet, staff, datacenter are all included in that $47 / Th/month. Cheap power would be ~$0.03 / kwh.