MY summer power is 17 fucking cents a kwatt! but even at 17 cents my rigs earn money.
lets say 50 kwatts a day for 200mh that is 85 cents x 30 = 255 usd for power!
but right now 200 mh is earning close to 780 a month so I net over 500 usd a month.
So if the difficulty doubles and the price drops 40%, you will make a loss. The farms must have cheap electricity.