Behold! I present to you… the future!
According to Engadget, Intel has a new sensor on the market that will make it easier than ever to measure your energy usage in the home. What makes this different from other power monitoring sensors? Evidently, you only need one. Just one plug, somewhere in your house, and you get detailed information about all your energy consuming appliances. This can give you instant feedback on spikes (microwave, printer, etc) and encourage you to turn off those lights when you leave the room.

