They have plenty of land and must have been earning pretty well before they took this on to get that land, or have had money left to them. They are also young, so have the energy to do all this.
All of us could do a bit, but in towns and cities where there are rows of terraced houses, it is a bit limited, although everyone can do something.
I think the only real problem we have living without power is water. If we had a well it would have to be over 100 ft deep as we live on a hill. I use rainwater for watering the garden, but wouldn't be very happy drinking it even boiled as we live near a busy road. We have a wood burning stove which can be used for heating and cooking, although we only use it for cooking if there is something that needs to be kept going for a long time and it is lit. I can make candles, so we have them at a pinch.
In the woods we don't have any mains supply, so bring water from home and use batteries for most jobs and a generator for things needing more power such as the charcoal bagging machine.
It is easier and more comfortable to live on grid, but we had the 1970s rolling power cuts during our late teens and early 20s, so learnt how to manage without.
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