A little extra advice for those in control of energy consumption at an office with a lot of computers: if your building has interval electricity metering (this typically records energy consumption every 15-minutes or half hour), analyze that energy data once a week or so to actually see how much energy is being used by equipment left on standby during lunch hours, overnight, and on weekends.

You can do this in Excel, or you can use a software product like the one my company makes: http://www.energylens.com/ – either way it’s a great way to figure out how much energy is being wasted, and it’s an easy way to see if the staff are actually turning computers off like you’ve told them to (without wandering the building in the dead of night).