Indeed, and if you want more proof of my power-to-size dependencies, in the mission for Team Regret they're carrying a "portable" battery the size of an engine block which will be enough to power the entire fort for a three days. Granted if they know what they're doing they could just use it to kick start the actual power generator of the fort, but still for something about the size of a large cooler, it'll be power a building about as big as a small suburb neighborhood.