Being able to see how much energy every device in your home is using would let people make energy efficiency upgrades with the most impact and make behavior changes to save energy and money. (treehugger.com)
You can observe this meter in order to figure out how much energy a device is sucking down. (howtogeek.com)
For example, computer data storage and solar energy devices are all less efficient because of heat buildup. (scientificamerican.com)