Studies in economic psychology have repeatedly revealed that energy consumption behavior in the household could be optimized through the provision of frequent and immediate feedback. This aspect is still widely neglected by conventional metering equipment installed in most homes. Energy meters are generally placed at quite hidden locations and reading them only once a year or at best once a month for billing purposes remains the rule. Especially observation of variations or trends over longer periods of time is cumbersome and has to be done on the basis of handwritings or transferring manually read data to applications like spreadsheets. We introduce Perceivable Energy, a system that supports pervasive approaches to raise awareness of energy consumption. More innovative feedback mechanisms like, e.g., ambient displays are backed by a more conventional graphical user interface to provide detailed consumption data on demand. The system is designed to make integration and interconnections of new metering devices and visualizations simple and constitutes a good basis for further research on awareness of energy usage in our (future) living environments.