Energy Owl
The Energy Owl is a home energy monitor that attaches to the meter outside your home and displays data through a PC interface.
From the How It Works section:
eGauge Energy Monitor
The eGauge is an energy monitor that uses power line communication to send data from your home's breaker panel over your home's electrical wiring to the HomePlug adapter, and then to your computer through a wireless modem.
From the eGauge overview page:
Pages
