It's not really that electricity is more efficient (is IS more efficient in most cases, but a key point of the book is that we can't "efficiency" our way out of the climate crisis). It's that as long as the generation of electricity is clean, the use of it is also clean. We already have clean ways of generating electricity that are cost-competitive with fossil fuels, and by scaling up production it will actually end up massively cheaper than fossil fuels. But there is a high upfront cost to switching, so financing the switch is one of the biggest challenges.
The book is quite thorough in laying out all the challenges (eg, handling variable production from renewables, how to get buy-in from existing fossil fuel stakeholders, etc) and presents realistic solutions for each. I recommend you pick up a copy and read it!
The book is quite thorough in laying out all the challenges (eg, handling variable production from renewables, how to get buy-in from existing fossil fuel stakeholders, etc) and presents realistic solutions for each. I recommend you pick up a copy and read it!