You can store oil. In significant quantity. You can't store electricity in the same way, easiness and quantity. So in case of a war you still have, any country still have months of oil reserves, very little electricity reserves in the form of pumped hydro, fossils and nuclear powers. Not only: a electricity grid disruption is almost instantaneous, oil&gas issue takes at least days and can be foreseeable in months and years.

At a small scale: you can easily store in your garage 1000l, 2000l of diesel. You only need two cheap plastic reservoirs with a supporting structure (something here in EU south priced 50-200€ per tank) and or a high enough support (gravity fall) or a manual/electric pump (various price but in the range of 200-500€ more maximum) and your car will be autonomous for a certain, not that small, amount of time. Similarly to heat your house you might have perhaps 5-15.000l tank underground in your garden, normally sufficient for an year of heating. You can also easy store hot water, it does not last that long but two day is doable. You might have wood burning backups etc. Electricity? Try just to compare the impact of a 5 day gas station strike vs a 5 day blackouts for yourself.

My personal lithium storage suffice for a night at minimum service (just lights, fridges/freezers, home rack etc NO heating/cooling without Sun) and its price was ~4k€ (battery) + 2k€ (battery inverter) for an estimated maximum service life of 10 years. While diesel reservoirs and pumps can potentially last 100+ years. Surely the Sun tend to shine a bit all day, but just to live on it I need at my single-home scale the price of a mid-range car for a similar MTBF. With a very cheap and resilient solution I can survive few months without diesel supply. With relatively cheap freezers I can survive a month or two grocery supply without special attentions. Without water things get complicated, but I still have a bit of autonomy anyway. Without electricity I have a small autonomy thanks to p.v. + lithium but while all the rest it's doable by anyone the p.v. system is too expensive for most and still not suffice to heat the house in winter. In summer I can cool it during the day and lucky here nights are always fresh, but you get the idea.

At a bigger scale I do not have sources is English, this is a study by French Gov. https://www.economie.gouv.fr/files/files/directions_services... on the topic, it's conclusion are: we can't run France on renewable nor now nor in the foreseeable future. And that's a study by public body only, no interested parts for nor fossil nor renewables sectors...