Um...this calculation is ridiculous and isn't right. The last time I calculated cost to produce a Bitcoin, SP30 had been out for a while and the energy price was like 2/3rds or higher with the hardware being the rest. The energy price was something like $150+ then, and that was maybe over a year ago. Besides the Bitfury 16nm chips, which I'm not sure of how many of those are deployed, efficiency hasn't change that much, but hash rate is a lot higher. There is no way in hell the electric cost to produce a Bitcoin is $75 now. It's probably somewhere between 200-300 with (huge) hardware costs on top of that.