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rule #1: be kind
High social acceptability: Installed far from inhabited areas, these facilities arouse less opposition.
Actually, being very close to inhabited areas, but 0 impact, including nonsensical nuissance arguments, means short power transmission. It's also very easy to pair with offshore wind.
Wow, someone invented upside down pumped storage.
I think I understand how the battery where they drop a big weight down a mountain works; how do these work? Or how does it compare in effectiveness as I assume it's probably the same principle?
It has a turbine inside it. It is not a cement ball, it is very misleading title. It's a cement shaped hollow orb with a hydro power generator inside it.
Well that sounds like cheating.
Sounds interesting, but considering how thick hydroelectric dams need to be to hold back a mere lake, how thick are these spheres going to be to hold back an entire ocean?
Oh I'm sure some rich bastards will find a way to ruin it.
They're going to...pull a vacuum in a concrete sphere deep underwater. And then use the force of water being sucked back in to turn a turbine.
...sure.
Each sphere has an estimated lifespan of between 50 and 60 years, with partial replacement of components every 20 years or so.
The concept is fascinating, but what I'm most curious about is how they achieve that longevity in seawater. Benthic life really loves to settle and build on hard surfaces.
I would imagine it wouldn't matter how many barnacles and stuff are on it. That's the outside. Everything important is inside, I'm assuming the intake water will be screened or filtered in some way.
Most benthic life (by number) start as tiny, motile creatures. Screens would reduce head pressure and require maintenance. Barnacles of all kinds, as an example critter, settle on everything to which they can adhere. I'm guessing the engineers considered these complications since there have been past power project failures because of sea life. I wish the article went into those mitigations. If it's somehow a non-issue by nature of the design, my curiosity is even more piqued.
Every time I see these “We’ll do X in/around the ocean” projects I think, “These people have not spent a lot of time near the ocean.”
There are 2000 year old Roman concrete piers that are still just hanging out in sea water. So it's possible if you find the right mix.
The concrete isn’t the problem. Like mentioned above, the sealife growth is. Also, metal and moving mechanicals are savaged by seawater (and the sealife growth). Keeping things working on the surface of the water is difficult and expensive. Water pressure makes that even worse. Maintenance requires divers which are likewise very expensive.
Really good points. I was only thinking of the structure of the concrete... Sea life growth is a whole other ball game!
Benthic Life needs to be band/album/movie title.
Unfortunately, you can't see BENTHIC live.
They don't have a tour planned.
https://lifeforcerecords.com/archives/artists/benthic/
Of course they’re not touring. They’re sessile.
💀
I’m pretty skeptical about this- wouldn’t a 30m sphere be incredibly buoyant when empty? I get its concrete, but it’s displacing huge amounts of water. So you’d need some massive anchoring, maybe that’s not a big deal. Second, I don’t know what depths we’re talking about here, but I feel like the stress from cycling these things daily would be insane- in high pressure salt water no less. I also wonder what the efficiency of this system would be compared to other similar batteries, like pumped hydro storage. It seems to me pumping out water to near vacuum while under crushing outside water pressure would be a significant power hog.
It seems to me pumping out water to near vacuum while under crushing outside water pressure would be a significant power hog
Well, yeah. That's the point. It's a battery. Whatever energy you put in to pump the water out, you get some percentage (probably in the 50-70% range) of it back when you let the water back in. The point of these is to store energy from renewables whenever they are providing more power than the grid demands - otherwise the power would be wasted.
Edit: The paper claims 72% efficiency which is pretty good if I understand things correctly
Yeah don't get me wrong- I get it’s a battery. But a battery that’s 5% efficient isn’t great. Now 72? That’s pretty incredible, I’d like to see that in action.
The most pressure it would experience would be the difference in internal vs external pressure. At 1000ft of depth there’s a pressure of 440psi. Assuming the sphere somehow managed a perfect vacuum that’s still well below the 6000psi compressive strength of high strength concrete, hell they would still have more flexural strength. The spheres themselves definitely wouldn’t be the weak link.
I don’t know what depths we’re talking about here,
From the article:
The idea is relatively simple: hollow concrete spheres are installed at a depth of several hundred metres.
I would like to know what is the % of loss when storing power as any energy conversion is not lossless.
Cheap storage is more important than conversion ratio. Enough renewables leads to periods of negative prices without matching storage capacity. Storage can mean 1-2c/kwh charging costs, and even 50% efficiency makes discharged power 2-4c/kwh.
if 0.5m thick sphere, 30m diameter is 1413 m^3 of concrete. $300k to $400k in materials. Stores 150mwh power. About $2-$3/kwh
Regular pumped hydro has an overall efficiency of about 80%. I would guess these sphere things would be similar, assuming you can put them near a high-voltage line, since the underlying technology (pump and turbine) is the same.
Interesting concept, but not very scalable. It's basically a reversed dam - when it's full, there's 0m head of water. Then with excess energy, you lower the level inside, storing the energy in the water outside. E.g -2m head. Water then flows in to equalise head, and doing so, regenerates electricity. Adding depth to supercharge pressure differentials is a good idea, although I wonder how they limit the flow rate, or otherwise prevent cavitation shocks each cycle.
Could be useful as a private industrial battery, but a dam would still be better on an infrastructural level.
Dams do have their own significant challenges with habitat destruction and displacing people and silt buildup
Dams have issues around silt buildup over time and to the best of my understanding the US is already dammed to the max (within reason).
I'm keen to see how it pans out. Seems like a very interesting concept.
damned to the max