Energy monitors such as this one encourage you to change your lifestyle and reduce your overall carbon footprint, by showing you just how much power your home is using at any given point in time. In fact, it's believed that households that use real-time feedback can reduce electricity use by as much as 6 to 18 percent.
The PowerCost Monitor is a two-part device. A sensor unit attaches to the face of the power utility meter outside your home. Using an infrared eye, it reads the movement of your meter's dial, then transmits information to a receiver/digital display that you keep indoors. It's not compatible with all meters, so be sure to look your's up before placing an order.
Although it will take you a few months to make up for the cost of the unit (~$110), you'll enjoy saving up to 20 percent on your energy bill with the PowerCost Monitor thanks to the sticker shock of watching your energy use in real time.