I recently started reading "Sustainable Energy Without The Hot Air"[1], which is available as a free book, and it's been a wonderful introduction to reasoning about alternative energy. The author also gave a talk a few years ago that is very approachable[2].
It's interesting, but his solar PV assumptions are pretty outdated in the book. He talks about utility scale solar being 10% efficient, where as it is around 17% now. Even at 10% efficiency, he says it's feasible, but too expensive. We are now at 2.42 cents per kWh unsubsidized for utility scale solar, in the best case. He says solar PV is 4x as expensive as conventional electricity production, which is clearly not true anymore. And the trend says PV will be 4x cheaper than coal within a couple of decades.