>> 0.15 * 5 * 24 * 30 * 0.12 => 64.8 if your 5 computers take 150 watts each and it's 12 cents per kilo-watt hour, then your bill would be $65 they must spend

>> 0.15 * 5 * 24 * 30 * 0.12 => 64.8 if your 5 computers take 150 watts each and it's 12 cents per kilo-watt hour, then your bill would be $65 they must spend a lot of time asleep or something.