The cost of electricity used by miners should never exceed the miners' revenue (assuming most miners only mine when it's profitable to do so), which is currentl

The cost of electricity used by miners should never exceed the miners' revenue (assuming most miners only mine when it's profitable to do so), which is currently fixed at approximately 3600 bitcoins per day, or $3.6M at the present cost of $1000 per bitcoin. Factor in the all the expensive ASICs miners have to purchase and it's likely a lot less than that.