Hmm it seems I have fucked up my character in PoE2 by using the spirit gem for the wrong thing. Seems the only way to get a new one is to start the game over or farm zones forever, wtf. Huge red flag there. I guess I'll plod along without power charges :/
We tried the bosses that drop them, but it's a one time drop apparently. Random drops are so rare it's faster to create new characters according to reddit posters :/ (Who will then be useless in the later game if you pass the gems along ugh)
I hope they fix that for release as all I've seen today looking it up is a lot of angry posts and mods stepping in to douse flame wars....