Get a "Kill-O-Watt" for about $20. Test a PC at idle. Then load up the bitcoin processes, and test again. You will indeed find that the PC is drawing considerably more power under load than at idle. Multiply the increase in wattage by the number of hours in a month, then by the number of PCs you're talking about, and then divide by 1000 to get the increase in kilowatt hours. Multiply that by your cost of power per KWh.
Then go read how increasingly impossible it's becoming to mine coins, and how you'll have a very difficult time getting one.
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Get a "Kill-O-Watt" for about $20. Test a PC at idle. Then load up the bitcoin processes, and test again. You will indeed find that the PC is drawing considerably more power under load than at idle. Multiply the increase in wattage by the number of hours in a month, then by the number of PCs you're talking about, and then divide by 1000 to get the increase in kilowatt hours. Multiply that by your cost of power per KWh.
Then go read how increasingly impossible it's becoming to mine coins, and how you'll have a very difficult time getting one.
Then don't do it.