It can be hard to transmit data wirelessly from the inside of a metal box, so instead, Curb transmits the data to this powerline adapter through your home's electrical current. Plug that adapter into your router with an Ethernet cable, and you'll be all set.
You can also view your home's power consumption over time in a variety of different ways. This stacked graph shows you how much each light, device and appliance is contributing to your total energy consumption over time. You can also track the energy production of any solar panels you might own in the same way.
Curb costs $400, plus whatever the electrician who installs it charges you. That's not inexpensive, but it's still a pretty impressive pitch, and a product that the CNET Smart Home team will be keeping a close eye on this year.