Another maybe bug or something i don't know about, i was in the twilight forest for the first time, inside a maze and just removing some iron bars with my drill, it had over 7k eu left and i wasn't using my lap pack.
I noticed the progress bar for power was missing, checked and it had 7k left, hit one iron bar and poof it disappeared. Quite annoyed considering i only just made it yesterday and use a lot of resources to do so.