Power stats for my machine:
http://mrtg.coloclue.net/power-watt/...-4a_kwh_5.html
Average is at about 30W, this is for the Atom 330.
The Atom 330 has a TDP of 8W, the 230 a TDP of 4W. So most of the power isn't even going to the CPU but to other parts (Disks, chipset, etc.).