Speaking of making visible the invisible, an Epson program to make its employees more aware of their energy use found that those employees used 21 percent less energy over a two-year period:
The elements of this include comprehensive energy data collection, calculation of performance indicators and compliance with ISO14001. A new staff induction programme includes identifying the importance of energy efficiency. In common with other Epson facilities, there is a 'green factory committee', and an unusual and impressive 'energy mirror' in the main entrance that records and displays real-time electricity and gas use for all to see.
(via Judith Lewis)
From the article, it seems that they simply took concrete steps to both better monitor their equipment's energy use, but also upgraded lighting, computer, and other systems, such that energy use decreased. I didn't quite see how this led to changes in employee behavior that decreased energy use.