this post was submitted on 07 Aug 2023
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@MattMastodon @Sodis We're going in circles. Volatile sources can only supply 40% of current demand for £50/MWh. The question is what fills the rest.
If storage, then the price goes up immediately by at least two conversion losses from/to storage, in addition to the cost of storage itself. Which doesn't exist at the needed scalability.
Pointing to single projects is not meaningful, as we need to build a fleet anyway, which has its own dynamics.
@Ardubal @Sodis
OK so I have googled the men capacity factor and of course #nuclear has nearly 100% and #renewables only 40%.
But this just means it produces on average 40% of it's capacity. You'd need a sunny windy day to get 100%
What I've read about is a #SWB (Solar wind and battery) system with massive overcapacity
So biomass, hydro and battery can take up the slack when needed. Or gas - which has a very low mean capacity factor <10% but is usually used as a last resort
Cheap #zero #CO2
@MattMastodon @Sodis
I'll try to explain the 40%, sorry for the parts that you already know.
Electric energy is always produced at the same time (and »place« roughly) as it is consumed. (You can't pump electricity into some reservoir to be consumed later, you always need a different energy form for storage.)
The problem with volatile sources is that they mostly (more than half) produce energy at the wrong time and/or the wrong place, and at other times produce nothing.
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@MattMastodon @Sodis
⇒ Aside: the »place« problem is that you can't build solar panels and wind turbines just anywhere, and they need a lot of space. E. g. Germany has now the problem that the wind blows much better in the north, but the industry is more in the south. So, you need a lot more/stronger transmission lines. Same for offshore wind: more wind at sea, but you need a lot of cables.
The more wind and solar you already have, the more the good places are already taken.
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@MattMastodon @Sodis
⇒ (But at least we already have transmission tech, it is now just a question of materials and effort.)
So, assume that we have enough wind and solar that we can regularly produce 100% of demand from them. You can imagine peaks just touching the demand line at top demand.
(You could imagine more than that, but that would mean overbuilding, which hurts the economics quite badly while not making the end result much better.)
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@MattMastodon @Sodis
⇒ Now the volatile supply line has valleys between the peaks. If you integrate over time and place, the supply line covers about 40% of demand in this situation.
That is /very rough/ and depends on a lot of factors, but my point is the same if it were 30% or 60%: where does the rest come from?
- Transmission: as already mentioned, we know how to transmit electric energy, it's just material and effort. This smoothes out the »place« dimension.
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@MattMastodon @Sodis
⇒ - Storage: obviously, we'd want to smoothen out the time dimension as well. This means adding storage that can meet 100% of demand as well (volatile sources frequently drop to 0), and feeding it with enough additional clean sources that it can fill every expected gap (and gap accumulation).
And here I'd like to repeat my point from before: the best (most effective) storage we have right now is pumped hydro, by far. And pumped hydro is not enough, by far.
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@MattMastodon @Sodis
⇒ - Backup. Of course, anything inherently CO₂-producing is out for this, and this includes gas, obviously, and biomass (maybe less obviously, but think about it). And that leaves?
So, this is my plan: keep building solar and wind till peak demand is sometimes met, build nuclear to replace all the fossil »backup«.
@MattMastodon @Sodis My thinking about biomass: if we don't burn it, it will not be released as CO₂ to the atmosphere.
I guess the thinking about biomass was: if we only burned biomass, not fossil mass, then we'd have an equilibrium and no problem. But saying that biomass is net-zero gets it backwards. The CO₂ doesn't care where it's coming from. It is our task to produce as little CO₂ as possible. The goal is to get below the amount of CO₂ /captured/ by biological processes.