Hi Paul,
The book is really about the principles that will apply to everything that runs on renewables, which have a different availability pattern to fossil fuel electricity. It's about the different architecture and ops patterns that will need to apply to everything. Fortunately, they are very much in line with modern best practices: multi tenancy, autoscaling, reduced time sensitivity, graceful downgrade options. That kind of thing. So yes, it has more effect if you are a big player but the knock on effects of adopting best practice are good for anyone.
Cheers,
Anne