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. Taking car batteries and daisy chaining them will act as an energy storage device, but you're going to need to generate power. A generator running on wood, gas or a diesel engine where you can make your own fuel is good, but the real payoff is using renewable energy by making your own wind turbine out of PVC pipes and a car alternator or scavenging some solar panels near a highway. When the events do take a turn for the worst, at least you'll be able to be productive at night and have some of the luxuries of your former life.
Having electricity in your safe house will keep the lights on and keep electronics running. Electricity is important to run power tools, welders, water/fuel pumps, radio equipment as well as charge any portable item or comfort item you may wish to use. It'll be a surprising source of morale, too.