One of the things about energy usage is that it requires your drivers to be all really behaving and in sync. Apple has probably spent many hours optimizing and

One of the things about energy usage is that it requires your drivers to be all really behaving and in sync. Apple has probably spent many hours optimizing and organizing everything so that the power states all behave as they expect in order for the whole thing to deliver nice perf and power usage. Switching to Linux changes everything. I'm not saying it's going to be worse, but remember that every single driver will be different.