“The power goes out” luckily is a very, very rare event here. A 20 minute outage in a part of a city is a story in the national evening news. The longest outage I remember was for five days in a few villages, and it was in the daily news.

So being able to supply my own power is a rather extreme prepping thing. But as feedback of power into the grid only pays 5ct per kWh, storing and using it is important. Having an active outlet is a bonus, not a survival thing.