There is also a significant cost to moving electricity production from a relatively small number of centralised plants to almost everywhere. Once the infrastructure is adapted to that, costs should normalise again.

> There is also a significant cost to moving electricity production from a relatively small number of centralised plants to almost everywhere.

Correct, but that cost is a negative number.

When the generation happens in the same location where the electricity is used, you don't get the significant transmission losses. You don't have to build and maintain big transformer substations. Obviously this doesn't count for big utility-scale solar arrays. However, every commercial warehouse, for example, could cover its roof and have near-zero transmission losses for most or all of its energy usage.