Oil lamps are my number one for blackouts. I keep a couple stashed in key spots around the house, along with a little jug of lamp oil (smells nicer than kerosene, and somehow feels cozier). Candles are handy, but I find the steady glow from an oil lamp makes it much easier to read or move around safely at night—plus, you can adjust the brightness.
Hand-crank lanterns are clever, but my hands get tired if I try to use them for more than a few minutes at a stretch. I like things that just work without needing much fuss, especially if the outage lasts through the evening. It’s surprising how much comfort a gentle light adds when things