Adam1 wrote:
Lets say that the renewables based grid has an average EROEI of 1:20 and the liquid fuels energy production system's average EROEI is 1:10
For a given expenditure of energy, we are getting twice as much out of the electric/renewables system.
Yes you've got it.
Using your numbers it means that for each 1% of oil production that drops we only need to replace 1/2% in equivalent energy production.
Half as much effort for the same utility.
The numbers are better than that though. It's 4X by the time you factor all the way through. Because the renewables are double and the electric car engine is double giving you four times not two. So you in reality you only need 1/4% for each one percent decline in oil production.
As I mentioned before, there is the problem of the transition (cost/time of converting our energy production and transport infrastructure.
Yes. Up till now renewables have been scaling up at breakneck speed. At some point we will run into infrastructure and human resources constraints at which point it will plateau. For that reason (late start + plateau) we're still looking at a medium term decline in net available energy across the board. But the good news is that the low lying fruit like electric mass transport and electric freight is very low lying fruit and can be ramped up rapidly even if the mass market electric vehicles could take two decades or more to ramp up.
Plus there is scale-ability. Can renewables, even at higher EROEI rates, deliver the energy flow rates?
Yes they can. Oslo proves it.
Don't get hung up about the source of the electricity (hydro), an electric grid is an electric grid. We can use any kind of electricity we want if we have the infrastructure in place.
Are enough of them located in the places where the those high energy flow rates are currently required. There are still problems storing enough energy in an electric vehicle to get the necessary vehicle range.
You're talking about the mass market electric vehicles here.
The answer is yes, but not in sufficient numbers. As for vehicle range, 80% of daily commutes in the USA are less than 15 miles each way. That problem is effectively solved with current technology. With newly discovered on-the-drawing-board technology, there are new batteries with 10X the charge by volume as the best of the breed current tech.
If we'd started the energy transition 40+ years ago, I'd be as optimistic as you. If we had a more far-sighted, wiser and courageous political and corporate leadership, I'd be as optimistic as you. But that isn't the situation we are in.
I think you overrate my optimism. I'm happy that we're not headed for dieoff. I am convinced that the most unscathed country is going to suffer a hard recession before pulling out whereas the worst will go into a decades long depression before pulling out. That's still a lot better than worldwide global collapse back to the stone age which is one peak oil scenario.
The transition will be very bumpy now.
I agree with you. I don't know what your position is on global transition.
My position is some areas will have nothing more than a hard recession but otherwise life will go on as usual. Other countries will go from being first world countries to being Argentina like. I fear that is the fate of the UK. That said it is quite possible that heavy manufacturing moves to the lucky places and they have serious booms and end up supplying the rest of the world. Much like the USA did to bombed flat Europe after WWII. Europe had effectively two decades of poverty before things started to pick up and other areas fared even worse. During this period the USA boomed because it was the "last man standing". I think there is a chance this will happen this time around. Sprechen sie Norwegian anyone?
We will have to squeeze increased efficiencies out of our existing ICE vehicles using non-technical means such as car sharing, planning our journeys better and by enjoying the pleasure of staying put. Maybe by the time my baby son is in his old age, the energy transition will be complete and he will be able to enjoy the benefits of this greater energy production and consumption efficiency. However, there are so many other problems in the pipeline, like climate change and water scarcity, that I find it hard to be as optimistic as you, or as glib as RGR.
I think after this discussion our positions are still closer than you initially thought.