To test power consumption today we are using a Kill A Watt power meter. We loaded the system with some games and measured results at both full load and idle.
Foxconn claim that this system consumes around 28-30 watts when playing back HD content, which was close to our own test results. It is one of the most efficient little computers we have ever tested and peaks under 40 watts load. An incredible result and ideal for 24/7 use as a home server.