Blockchain.info has a stat for mining profitability based on electricity consumption of 650 watts per gigahash. This seems like a high figure to me in the age of ASICs. What would be a reasonable figure to use, based on ASIC machines currently in use? (as opposed to vapour-ware promised for next year).
I wrote to them complained about it a month ago. No reply. The figure is 6-8 mths out of date. The energy is down to a few percent of that. 650Watt is a GPU rig figure.
Yeah even if some use gpus for heat you may have free electricity but not free heat so running a gpu would make sense in the winter.
Most hashing is asic the number should be under 20 watts