Most people use their computers as terminals, that need to be connected to large datacenters, through the internet so they can do the things they want, from watching cat videos, to listening to their favorite songs to shopping or writing office documents on online productivity webapps.
Also renewable energy projections don't really support that view at all. Renewable energy costs are plateauing, as with Li-ion batteries (2022 was the first year that the average cost of batteries haven't dropped since the BNEF started their analysis in 2013). And with the need for more energy storage, more transmission capacity, long term storage, flexible demand systems. The grid is going to be more needed than ever.
https://youtu.be/6zgwiQ6BoLA https://youtu.be/udJJ7n_Ryjg
Peace
Manufacturers used $/compute power as a core metric to guide their thinking around future product development. They were perplexed when people started buying PCs because they were 10x more expensive on a compute power basis, but they eliminated the friction associated with centralized systems (terminals, queues, the need to be connected, etc.). The value of a PC was invisible to them. Centralized generation of electricity has the same problem, the cost of transmission and distribution of electricity is so high that there is an inevitable crossover point where the cost of localized electricity generation and storage will decline below the cost of grid maintenance. At that point we will live in a new world of distributed power generation with deep implications for society. Can't wait.