Wearing headlamps: When the electricity goes out, I mainly wear my Myo XP headlamp, on low and with the diffuser. Low is enough for washing dishes, etc. I may buy a Zebralight, for even smoother and broader coverage of what's underfoot, at the same time as coverage of what I am heading toward. My reasons for using a headlamp include minimal energy use, light right where I want it, and hands-free use. Comfort and good diffusion are my reasons for using the Myo XP, and for considering the Zebralights. I have and use other lights, but indoors, I mostly rack up the hours while wearing headlamps.
Not in bathroom: The main exception is in the bathroom, where I may not be able to wear a headlamp. I want more light when I'm in the shower, so I won't fall. When I'm in front of the mirror to clean teeth, shave, etc., a headlamp would glare in my eyes. Instead, I hang a Freeplay Sherpa crank light from a carabiner, and bounce light off the ceiling.
Safety: "Each year unintentional CO poisoning not linked to fires kills about 500 Americans and poisons at least 15,000" (CDC). A carbon monoxide detector and fire extinguisher are wise, especially if your backup electricity, light, or heat involve combustion.
Storing light: When it comes to very-long-term storage of lighting capacity, carbide lights come closer to holding their own. My carbide in tightly-closed containers is in the same usable condition as 30 years ago. I once saw a candle, intended for emergency use, that contained a grub, which had chewed in about an inch. Not a likely event, but it helped me to realize that long-term storage can fail for many reasons.
Storing water: It probably is more trying to be without clean, running water than to be without mains electricity. In recent years, I have been lucky enough to have had clean, running water, even when the electricity has been off. In the absence of clean water, I probably would hoard my water supply for drinking and food, and slacken off on personal hygiene. 😀
Speaking of water, the Steripen looks interesting -- another use for a light and batteries.
Storing food: If you have any chance of mice or larger critters, or you get tired of dust, or you want stuff to be out of sight, then metal storage cabinets may be more satisfactory than storage shelves. I am thinking of the kinds that are about 6.5' high x 3' wide x 2' deep (deep and wide for stability). The problem with metal storage cabinets, is that the vertical panels of metal storage cabinets may be made of very thin sheet metal, which can get bent in transit.