I've searched around and contacted AppleCare, but I couldn't find an answer from either. I've compared the readings of when the Macbook Pro was 2 Weeks old and now 9 Months old and the one that's concerning me is the DC In and CPU Package Total readings from iStat Pro. Before: DC In - 0.00 V CPU Package Total - 3.27 W Now: DC In - 20.18 V CPU Package Total - 13.04 W Both were in similar usage (Safari, VLC Player and EyeTV). I've recently received an electricity bill which is around 5x the normal amount and I'd like to rule the Macbook out. Is this behaviour abnormal in comparison to yours? Any help very much appreciated!