Photos: Getting your green on for Earth Day

Track energy data. Most people, it seems, have only a vague idea of how much energy their home is using and where it's going. But that's changing as more home energy monitors come onto market. Some companies like Tendril offer their products, which have a Web interface, through utilities. Others like The Energy Detective (TED), pictured, can be purchased by consumers to get a view of how much a home is consuming at a given time. This product requires an electrician to install it and provides software to provide more details on your monthly electricity bills.

See this sampling of twelve home energy-monitoring gadgets.