undefined | Better HN

0 pointsaksss6y ago0 comments

It's simply this: our DAILY growing (not declining, not stable) demand for hydrocarbons is so profoundly huge, that the improvements in renewables (even if taken at generous face value) do not dent it today nor will they in the future even with the most generous assumptions about efficiency and storage improvements. This is just data you can look up to see the trends for daily barrel of oil demand, and the improvement rate of solar/wind and storage efficiencies. The numbers are the truth, not hope.

Developing societies such as Africa, India and China are increasing their consumption for the next few decades at least, radically accelerating the demand for hydrocarbons. India expects a quintupling of coal use in the next 4 decades. Airline miles will quintuple in much shorter period of time (like ten-twenty years). There is no shortage of hydrocarbons to naturally limit these demands. Politically there is no way to restrain newly developing nations. Technologically there is no net-positive energy generation source that competes on a density basis with fossil fuels. Again, the numbers tell the story.

I sincerely appreciate your frustration and hope for something different/better, but you need to come up with contrary data to argue these points. A hope in technical improvements year-over-year is all you've pointed to, and the trendline of capacity and efficiency improvements doesn't back that up. Further cost paid for a solar panel is not a benchmark. Energy intensity of its emplacement to bring it online is what its output needs to be balanced against. Its output, limited by useful life and useful operating hours really hamstrings its total lifecycle cost after the fossil fuel intense journey it takes.

0 comments

3 comments · 1 top-level

pfdietz6y ago· 2 in thread

You seem to be saying that renewables require improvement just due to the scale of the problem. But once renewables are sufficiently cheap, or once CO2 taxes cause fossil fuels to reflect their true cost, all that's required is just building more of them. This is a matter of scaling up, not improving the product, although improvement will almost certainly also occur, due to experience effects if nothing else.

That renewables are still a fairly small percentage of global energy demand is a good thing. It means that these experience effects still have room to kick in. Extrapolating the demonstrated experience curve gives that resistive heat from PV will be cheaper than heat from burning any form of fossil fuel, by the time PV has expanded fully.

The investment required to go 100% renewable will be many trillions of dollars. But the world GDP is $87 trillion, and the world spends about 10% of that on energy each year. There is enormous capacity to invest in energy infrastructure -- which is good, because enormous investment will be needed, regardless of what that infrastructure is.

aksssOP6y ago

> seem to be saying that renewables require improvement due to the scale of the problem.

Certainly they must be competitive in terms of energy density otherwise how can they substantially displace another energy source? Today renewable tech is not energy dense enough.

> Once renewables are sufficiently cheap

..cheap in total lifecycle cost (not end user cost of panel), carbon negative and sufficiently energy dense (transportable at light weight/low volume relative to stored energy)

> it's just building more of them.

For all of this, please remember we're talking global scale for electricity generation (<30% of fossil fuel use today), plus transportation, and manufacturing, not just electric use at my house or even a small country.

Straight cost - you mention taxes and regulation. This implies regulatory disincentives to produce and consume fossil fuels. It's relevant to note that at no time in recorded human history have humans backed off the consumption of an energy source unless a better replacement (more dense) was found. We nearly deforested the US east coast and almost killed off a whale species until coal came along and saved both (true story). Now we couldn't go back if we wanted to because civilization assumes a certain amount of energy input. Reducing it would have huge humanitarian impacts. Stabilizing it would be good, but this unfairly puts a huge burden on developing regions who would likely not tolerate it anyway.

Technology improvement - Look in the graph below at where diesel is relative to a Li-Ion battery. That's the gap it needs to make up at 5% efficiency gain per year (many orders of magnitude). It's beyond optimistic to say that would be covered any time soon barring a miracle (the track record shows that Moore's law doesn't apply to solar cells and batteries).

https://en.wikipedia.org/wiki/Energy_density#/media/File:Ene...

Even if you doubled the rate of efficiency improvements to 10% annualized, it's still an unrealistically wide gap to make up in my lifetime at least.

Fundamentally, for your position to be true you have to assume a miraculous leap forward in technology. And/or you have to assume some global-scale rational decision making (or force) to reduce consumption voluntarily (or involuntarily :/), in contrast with the whole of historic human behavior regarding energy consumption. Seems like there's a lot of hope involved there.

pfdietz6y ago

> This implies regulatory disincentives to produce and consume fossil fuels. It's relevant to note that at no time in recorded human history have humans backed off the consumption of an energy source unless a better replacement (more dense) was found.

We have plenty of examples of humans forgoing technologies that turned out to have downsides. And it's a near universal truth that dire warnings were given about these restrictions, warnings that turned out to be vastly overblown. Technology does step up to the plate when market incentives are in place.

> Look in the graph below at where diesel is relative to a Li-Ion battery.

Li-ion batteries do not have to become as energy dense as diesel for fossil fuels to be displaced. Some applications don't require that energy density. We are already seeing battery electric buses, for example. In other cases something other than batteries can be used, for example hydrogen. In the worst case, net zero CO2 diesel can be made synthetically, using energy from renewables (and carbon from either CO2 capture or biomass; use of biomass would be limited to these edge cases.)

We are already at the point technically where a great deal of fossil fuel for transportation would be displaced if transport paid the true cost of CO2 emission.

> Fundamentally, for your position to be true you have to assume a miraculous leap forward in technology.

No, the roadblock is not technology, it's proper carbon pricing. That is the biggest obstacle.

1 more reply

j / k navigate · click thread line to collapse