User blog comment:TheFreddyFromThePizzaria/FNAF is NOT impossible guys!/@comment-25588272-20151123141142/@comment-26950258-20151123213931

Eh, a few things

First, the company most likely can't replace them because they're in a money debt. No one's coming to see the animatronics anymore, so they can't really afford to do much. Then again, they could probably individually pay for the servos, unless they're all dirt poor.

Secondly, this may be stupid, but what if the pizzeria has solar power? We never do see the outside of the place, so they might have solar panels that(somewhat slowly(VERY VERY SLOWLY))gather energy for the night shift. Not very plausible, but still possible.