So much this. I think my energy bill for my single PC as mentioned elsewhere in this thread works out about $70 (equiv) a year.
When I had the full whack server rack it was pulling that a month and 99% of the time it was idle.
When I had the full whack server rack it was pulling that a month and 99% of the time it was idle.
The price/watt ratio is helpful to have something you set, forget and don't notice running in the background.