Centralisation is more efficient. Centralisation is good. Because of centralisation and interconnection (power grid is a network) we only need to have power gen

Centralisation is more efficient. Centralisation is good. Because of centralisation and interconnection (power grid is a network) we only need to have power generation capacity equivalent to less than a third of the total power of all electrically powered machinery. If every household had to produce its own power, we would need either to carefully plan our usage, or to have as much production capacity as our peak usage, so globally we'd have 3 times as much production capacity as we have nowadays. That would amount to a tremendous waste or resources, an awful misallocation... It would be absolutely anti-ecological. The more you're using unpredictable energy sources such as wind and solar, the more you need backup power (batteries, gas, coal, nuclear, etc). Case in point: in the EU, there has been virtually no wind at all for two weeks (except in Denmark). So we burn coal and gas, massively. Germany has a power generation capacity 68% larger than France for roughly the same number of TWh produced annually, because it needs backup production capacity for all its windmills and PV solar. What's the result? Electricity is 58% more expensive in Germany than in France.