High tech or military related buildings and locations seem to have a better chance but I've also found a few in people's houses. Random Places - I have been able to find a few cores in random containers or just lying on a table or the ground but it's very rare. Theoretically, if they respawn somehow you could farm them for cores (albeit at a cost of ammo and stimpaks). Sentry Bots - These guys are pretty rare and super hard to take down (the one I encountered was hit with 2 mini nukes and still had to be finished off with a laser rifle), but they drop 2 fusion cores and some other goodies. Also, if you equip a companion with power armor they will need a fusion core but don't seem to drain it so it's best to just give them one with low charge. Since you only need to power one suit at a time I make sure to take the core out of suits I'm not using. Power Armor - At least a couple of Power Armor suits I've come across have already had at least a partially charged core. The difficulty in obtaining cores in this way varies but if you're an avid explorer you who searches every building (like me) you should have a good stockpile of cores in no time. This currently appears to be the easiest way of obtaining cores if you have the caps.įusion Core Reactors - Not sure if this is the right name but they are big light green generators (like the one you use to get a fusion core in the mission where you meet Preston Garvey) and are found in many buildings throughout the Commonwealth and always give 1 fusion core. Merchants - At least a couple merchants I've come across sell fusion cores. Here are the different ways I've been able to find fusion cores so far: