People's domestic habits are increasingly being targeted to reduce levels of CO2 emissions. Whereas domestic energy consumption has received a lot of attention with several reported studies on sustainable practices, there are very few studies on workplace practices. Nevertheless, these are considered as having much potential for reducing energy consumption. This article presents the findings from two field studies where two different types of prototypes for visualizing energy use were designed, implemented and evaluated in different types of workplace settings - factories and offices. The studies used design probes to explore how visual feedback for electricity use was interpreted and acted upon by employees in work settings. A striking observation was that it is very difficult to get people to change to more pro-environmental behavior and practices in a workplace environment. The article discusses why this might be the case.