I have 4 cent kwh and its boring now.  Still profitable but I can't find a reason to expand my mine, I have 100 amp service maxed out at 80 amps and even with cheap electricity nothing is looking great.  I wanted to run a 400 amp service but i really can't find a good reason.  90% of my gear is 3 years old expect for a few z11s and so its all paid off, I should sell my gear.