Electrification of transportation is already well underway. Obviously ships and planes will lag behind, and may even be forced to use biofuels if we run out of fossil fuels, but the idea that the world will stop when we run out is outdated.
Green power generation is also making huge strides forward, and battery technology is improving enough to make fully green grids a reality. We already see articles about how some countries are managing to go entire days without burning any fossil fuels for power generation. This will increase over time despite what the doomsayers predict. We aren't there yet, but the progress is almost inevitable.
The bigger problem is that we've already burned so much fossil fuel that we are noticeably altering the climate. This is going to cause a lot of stresses in the future, especially in a post-collapse scenario.
They’re going days without burning fossil fuels by using high tech solar panels and windmills and such. What happens when they stop being made and they eventually break down? You’ll have to bootstrap tech again but without low-tech sources of concentrated energy. Electrified transport is great today, useless two hundred years ago.
Solar panels are somewhat high tech, but wind turbines are 17th century technology. The electric motor you need to attach to turn it into a generator is also pretty low tech. You can even use lead acid batteries to even out the power delivery, and those can be incredibly low tech and also highly recyclable.
Obviously you're not going to get to 100% in a week if you're rebuilding civilization from the ground up, but if you can retain some of the knowledge you can get a big step up and hopefully avoid some of the pitfalls that caused the downfall of society in the first place.
Green power generation is also making huge strides forward, and battery technology is improving enough to make fully green grids a reality. We already see articles about how some countries are managing to go entire days without burning any fossil fuels for power generation. This will increase over time despite what the doomsayers predict. We aren't there yet, but the progress is almost inevitable.
The bigger problem is that we've already burned so much fossil fuel that we are noticeably altering the climate. This is going to cause a lot of stresses in the future, especially in a post-collapse scenario.