Is there somewhere statistics on Bitcoin miners electricity consumption?
Read this ....
"At its peak, the Changcheng factory churned out 100 bitcoins a day at each of its six sites, but the group of entrepreneurs is finding that as the level of difficulty and computing power increase, the ratio is gradually changing. The process uses about 1,250 kilowatt-hours of electricity, and the group's monthly electricity bill is about $80,000. They are currently mining from 20 to 25 bitcoins a day."
Here -
http://www.mining.com/inside-a-chinese-bitcoin-mine-20076/