Your main concern is atleast getting them some light. Total darkness will ruin them fast. They are going to stretch, and eventually flop over and die. Young plants will be effected more due to stretching. If they are a little older the stretching will be less critical. If u have money, get a marine battery and run CFL's for now.. Problem is is u need to recharge it every day or 2, and they may or may not come charged. If u have more money get a generator. It all depends on what ur crop is worth to u.
All I can say is figure something out if u don't get them light soon.