Google PowerMeter is a free electricity usage monitoring tool that provides you with information on how much energy your home is consuming. Google PowerMeter receives information from utility smart meters (like TED) and in-home energy management devices and visualizes this information for you on iGoogle (your personalized Google homepage). And, Google PowerMeter is free.
TED (The Energy Detective) is a simple, yet extremely accurate, home energy monitor that allows you to see electricity usage in real-time. TED quantifies electricity and displays the results on its easy-to-read LCD screen, and with its two-second reaction time, TED provides immediate feedback on energy usage.
Regardless if you are considering renewable energy options in the future, both of these tools can be very useful for tracking and hopefully changing your energy consumption habits.