Break Room
It's simple to be more energy efficient in your company's kitchen or break room. Just treat it like it was your own. Don't leave the fridge door open too long. Don't overstuff the fridge. Don't leave hot water running needlessly. Unplug coffee makers and other small appliances when they're not in use. The list goes on and on.
Another OneThing is to be an advocate for energy efficiency to your employer or purchasing department. Urge them to replace older appliances with new, more efficient ENERGY STAR models. Show them how much the company will save. Direct them to rebates and other incentives. Who knows? You might even get a promotion.