I also recommend looking through his list of books on the sidebar.
https://energypost.eu/dispelling-nuclear-baseload-myth-nothi...
Here's the summary page where the author asked if the UK could supply its energy needs from renewables alone:
http://www.withouthotair.com/c18/page_103.shtml
The answer was "not quite."
However, he assumed that utility scale solar farms would be using 10% efficient panels. 20% are now widely available. So let's make these two quick edits:
- Assume that solar farms provide double the energy from doubled panel efficiency.
- Drop biomass, because it's unneeded with better solar farms.
With these changes the renewable energy supply of 206 kWh/person/day exceeds modeled demand of 195 kWh/person/day. Making some other simple updates like assuming that car transportation is mostly electrified would further increase the margin of safety.