Who knows when a power outage will occur, not to mention power loss due to some kind of disaster. It may be a short-term outage or long-term. Either way, are you prepared? What sources of light do you have now? Do you have a way to charge your cell phone? What do you need? Do you have a way to run fridges, freezers, or cook food?
You need to research the options and find what works for you. Be sure to have a supply of batteries, fuel, matches, lighters, etc. for the lights you choose.
Emergency Lighting (ldsliving.com)
Again, it is difficult to give you information without appearing to promote a certain product. You can choose from solar powered, gas, propane or dual fuel generators, and solar powered/rechargeable power banks. There are various sizes for your requirements. You need to decide what works for you. How portable is it if you have to leave home? Can you store extra fuel?
There are YouTube videos that compare generators and power banks and make recommendations. We try not to promote any business or product.