@csepp Maybe this is where permacomputing differs from frugal computing.

Considering we need weather forecasts, we had better run them efficiently, and that means centralised as performance is limited by communication overhead. But we can and shoould run them on "old" hardware, and use renewables to power them.

Also, when we oppose "centralisation", we should be clear what it is that we are opposing. I would say it is the centralisation of control and power that should be opposed. Physically putting compute resources in a central place does not imply this. It also depends on the scale of the compute resource, and the degree of centralisation.