The Energy Tree is a conceptual device which monitors household energy use and recycling practices. Drawing data from the electrical sockets and devices plugged into the supply, it provides visual feedback via an information display panel detailing energy consumption.

In the longer term, the Energy Tree would encourage energy-efficient behaviour by creating an emotional bond between the user and a living tree embedded in the device. The tree would not need conventional care and maintenance. Its well-being would be dependant on how well the user utilised their energy supply. If the user acted in an energy-efficient manner the Energy Tree would provide the real tree with the water and nutrients it needs to grow and flourish. If the user was wasteful and inefficient with their energy consumption the Energy Tree would poison and malnourish the tree, eventually letting it die.

By placing the onus of responsibility of the living tree's health on the user and their ability to conserve and reduce energy the designer creates a strong incentive for behaviour change. The user will be concerned about the tree's well-being and if they neglect it they will see the direct results of their actions and feel guilty. However, the time taken for the living tree to respond to any changes in its care may weaken the 'cause and effect' relationship. It may be better to provide "instantaneous feedback of a behaviour change rather than waiting days and days for the live tree to respond"[1]