Gravity Energy Storage : A very uplifting technology!

[@petersilva037]

I have long experience with these technologies: My father has some 100 year old clocks. Every morning, we pull on chains to raise the weights up, and the clocks run on gravity energy for the next 24 hours.

[@yggdrasil9039]

Same principle.

[@Xray-Rep]

There's no such thing as "gravity energy". Every system that generates electricity via a mass falling from some height to a lower height, utilizes the energy of the massive object (may be water or any solid material) which was put into the mass (potential energy) while it was being raised to the highest point in the system. Think of gravity like a spring. The higher you raise an object away from the earth, the more the spring (gravity) gets stretched, pulling harder on the massive object. When the massive object is allowed to fall, that potential energy is slowly being converted into kinetic energy through gears and finally to a generator. Please don't think that this is some sort of "free energy" device. It most assuredly is not.

[@tzenophile]

@@Xray-Rep "The higher you raise an object away from the earth, the more the spring (gravity) gets stretched, pulling harder on the massive object." It's been 40 years since my high school physics, but this is clearly wrong.

[@pikkuraami]

Same principle. Now Imagine that weight being 10s of tons of mass and wire being 100m long in 20-35 m/s wind. Not that great thing when considering pendulum effect that system has. What works in small scale, doesn't always work in large scale. These are very good reminder of that. There are many variables that small scale can hide.

[@neliosamch3195]

@@Xray-Rep You are missing the point. Eccessive energy by wind and solar which is free can be stored for later use in these gravity blocks is the subject of discussion.

[@موسى_7]

As a British person, there's nothing I love about this channel more than the extremely British way he speaks in this video.

[@Chobaca]

Well there is the way he's trying to educate to save our human society...

[@Bouyphe]

+1

[@Sarahlenea]

As a French person, I love it too: finally someone who knows how to articulate to facilitate the understanding of non-native speakers ^^

[@PlumSack79]

Say English person from now on pal, British isn't a thing now.

[@LazyDog191]

As an American Colonist it is quite a treat to hear English spoken correctly..Also the content is quite interesting.

[@rgbii2]

I'm not sure how sustainable it is, but if you drop that hammer on your toe, you'll release a lot of energy as you hop around on the other foot. Biggest problem will be all the noise generated by this system, which may not be appropriate if children are near by.

[@andershusmo5235]

Simple fix: install a wind turbine in front of the noise source. The turbine turns the profanity energy into electrical energy, just as we do with the wind - you'd be surprised at the kinds of exit velocities that stuff can reach. With an efficient enough turbine, you can utilize a large enough portion of the profanity energy to make the noise all but inaudible, as well as putting some of that excess power to good use.

[@brianwheeldon4643]

Noisy, quite likely. In that case utilising defuct mine shafts seems a good solution at least as a starter.

[@wertigon]

Nah, it'd take way too long time to recharge - you'd need at least a week before your stubbed toe is fit for another go, I don't think your Netflix binge urge can wait that long!

[@berniebrown928]

@@andershusmo5235 mo moo. Mo moo m

[@masterimbecile]

These energy companies be dropping a lot of new developments recently. They understand the gravity of the situation.

[@tonynagy2042]

I made a crude gravity generator design around 2010(Then my computer got fried).... I presented a UV HVAC Upgrade system design to my employer around 2005(got shot down, as too expensive (BS).... I have other design's just in my head now about anti-gravity, and personal flying device(never seen a design close to anything like it yet) .... they'll have to dig me up and try to make sense of it through nuralink.... and thats all I have to say about that!!!... Cheers.

[@danquaylesitsspeltpotatoe8307]

Theres a real problem with Just have a think as he thinks this stupid idea is good! Hes that stupid! and should not be listened too on any subject even basic logic!

[@kenrobinson8060]

The gravity system was used in lighthouses to turn the lenses for over a hundred years thus giving the flash, a weight was winched up on a cable and when allowed to descend slowly through a gearbox turned the lenses which floated on a tray of mercury.

[@charlesharwood4724]

I had a gravity energy storage device for many years but had to get rid of it when I moved to a smaller house. It was also useful for telling the time.

[@dewiz9596]

I like the mineshaft concept. Out of sight, out of mind.

[@charlesinglin]

And there's no shortage of old mineshafts in the coal country of Appalachia, which could also use the jobs.

[@fredericrike5974]

@@charlesinglin Same in Montana, Texas, Michigan and New York- all at one time big coal producers.

[@PatrickKQ4HBD]

If they're digging new shafts, they can be put anywhere, including the densest of cities.

[@fredericrike5974]

@@PatrickKQ4HBD Keep thinking like that. There is a solution to our energy problem- some one of us or several of us will find it!

[@MSheepdog]

I feel like it's got less risk too. If a cable snaps in the mineshaft the ground might shake, but unlikely to lead to other property damage. With the stack of concrete it seems like there is higher risk of collateral damage if it collapses. Probably less moving parts in the mineshaft one too, which should make it easier to maintain.

[@humanperson5134]

Breakthrough! I've been watching this space for 53 years. This is far and away the most practical.

[@hessanscounty3592]

**Looks at all the empty mineshafts in the Appalachian mountains** Well, time to get cracking.

[@nickward1277]

Same here for the north of England!

[@DavidBeaumont]

@Bainsworth It's both. E=mgh. Double the height, double the energy. Double the mass, double the energy. I heard they have also been looking at using some of the abandoned mine railways with weighted carts (v. steep winch railways for moutain-side mines). Probably not as big in terms of scale but might serve a local community well and don't require as much building.

[@lawrence18uk]

@@DavidBeaumont railways in reverse!

[@lucaswilkins9217]

Instead of weighed carts, you could have a load that you can take on and off, increasing the storage capacity. Or you could use thanks that get filled with water. This could be then be further optimised by using a pump instead of the train.

[@beebob1279]

@Bainsworth I guess it depends on how long you need the power to run

[@Bassotronics]

They can redesign this by using a huge Neo magnet inside a huge copper tube. As the Neo magnet goes down, the copper tube slows down the magnet from falling fast due to eddy currents but still can generate the power needed from it falling. They can use that same eddy current via loop wiring to store energy to power the crane arms instead of using the wind turbines.

[@Handleyman]

The mine shaft is probably the best option. Not affected by adverse weather conditions, quiet and virtually invisible.

[@davidleaman6801]

Don't rule out abandoned open pit mines and the Grand Canyon. Existing Hydro dams also provide elevation. Lake Meade is drying up and will expose lots of room for a wind farm. Multiple installations and locations using the same concept but using varying techniques will be required.

[@Ana-ui5ep]

I'm an Electrical Engineer and I loved your channel! Continues! Success! Gratitude! 👏🏽

[@kalyana9705]

I heard about fully loaded trains moving up (by electricity) and down (by gravity) a mountain. They seem a lot more easy to set up. I think it is better than the crane based system shown here.

[@johnburns4017]

Using defunct mineshafts is the best idea. There are countless shafts in the UK and many other countries. Also, boring down a number of 1 metre diameter 1 km deep shafts, with long thin weights sounds excellent. They can be dropping at different times. They do not visually defaced the surface. Little maintenace required. If a cable breaks, leave the weight at the bottom of the shaft, installing another. The sooner the better

[@sophrapsune]

Don’t hold copyright payments against Johnny Cash. He did tell us, “Ain’t no grave can hold my body down.”

[@Wol747]

I have a book on sustainability written in the sixties advancing the thought that why use a weight for gravity storage when useful weights are commonly available. Houses, for example. You could live in the “weight” which is elevated during offpeak/renewables and dropped when the energy is needed. OK, you need pillars and umbilicals to bring the water, telephone etc, but heh! live in your battery AND have a better view half the time!

[@davidpowell3396]

Like a houseboat

[@grantlauzon5237]

could you do this with elevators/lifts in an existing skyscraper? I know there's usually counterweights but you could use regenerative braking to offset the differences in either direction depending on the weight. You'd still need to power the lifting of a heavy car and the lowering of a light one.

[@pspicerwensley]

There is a train used to provide gravity energy storage in California. ARES (Advanced Rail Energy Storage) already has a test track in the Tehachapi, California, region and also in Pahrump, Nevada it is building a 50MW facility.

[@Jecksnkovski]

I once had the fun idea to build my whole house as a gravity energy storage for to be installed solar cells or wind turbine while knowing that it would be far too expensive and impractical but I'm amazed that it's a legit strategy on such large scales

[@magicsasafras3414]

Yeah but is only good as a pumped hydroelectric dam. The energy vault design is the worst thing I have ever seen.

[@coenraadloubser5768]

@@magicsasafras3414 How so? It looks like a massive art installation.... and it generates cheap energy!?

[@magicsasafras3414]

@@coenraadloubser5768 it doesn't generate energy it stores it and terribly too

[@coenraadloubser5768]

@@magicsasafras3414 Sure it doesn't have the best carbon footprint, doesn't store much... and it's not wind proof - but not anyone can build a hydroelectric dam... I'm sure it has a place somewhere...

[@magicsasafras3414]

@@coenraadloubser5768 listen gravity battery's are good but only when designed properly. The company gravtricity made a simple design that works flawlessly on a small scale. Energy vault tried making a small scale system big, but that doesn't work. Pumped hydroelectrics are meant to store a city's worth of energy. Pulley battery's are ment to power something like a construction site for a short time.

[@mitchmomlc]

i love his optimism. with you all the way brother

[@Digital-Dan]

I once saw a proposal to do this sort of thing by dragging heavily loaded rail cars up hills and recapturing the energy on the way down. Advantage would be that only rails need to be added to the landscape, not complete towers, and additional "weights" could be added just by employing more freight cars. Same idea, though.

[@peterbrickwood3204]

Mine shafts are already there and less visible.

[@PatrickKQ4HBD]

That project was my first exposure to this notion of using weights to spin a generator/winch to make grid-scale electricity, even though I grew up with weight-powered cuckoo clocks and grandfather clocks.

[@mb-3faze]

@@peterbrickwood3204 The trouble with mine shafts is that they are inevitably full of water. You can either pump the water out which takes a lot of energy or be satisfied with less apparent mass powering your generator (dry mass minus displaced water mass). Still, worth a go: not much to lose in trying.

[@ashketchup247]

I love your channel, keep up the good work and thank you to all the patrons.

[@andreaswickman1508]

Angry Thunderf00t noises from the energy vault tower

[@yamilcoloma6677]

lol you beat me by 30 min XD

[@recklessroges]

I'm glad I'm not the only one that thought that.

[@CraftyF0X]

Haven't seem him in a while, did he already debunked this quite frankly ridiculously looking idea ? Im not a distinguished expert on the field but the whole contraption seems to me like an engineering nightmare with all the moving parts that can fail.

[@chulhogan1445]

@@CraftyF0X Yes, kzbin.info/www/bejne/hHrLdKiwrbOprJI

[@useodyseeorbitchute9450]

It's a bit tricky to debunk it, as formally speaking it does not violate laws of physics. Though someone who is able to make such system of rapid block construction work is clearly wasting his talent in energy storage sector, and instead should offer to build some affordable skyscrapers in a few hours. ;)

[@dadikkedude]

You give me hope for the future of our planet by sharing these innovations!

[@kdeuler]

it would be interesting to consider cases where harnessing the weight energy doesn't involve using electricity for power transfer. For example, the mechanical motion of descending weights could be hard-geared to a coolant compressor for a large AC system.

[@ps.2]

Sure, or build a wind turbine on top of the mine shaft and run a (clutched) belt from it to the mineshaft cranes. Thing is, electricity as energy transport can be very fungible and cheap. The efficiency losses in converting to electricity and back are often a small price to pay for the ease of moving the energy around. That is not to say it's *never* practical to use other means of energy transport. District heating is a prime example, in which you have a central boiler supplying steam to heat many buildings.

[@daos3300]

@Kurt Euler or you just utilise the nearest free source of energy = wind or solar

[@brokkoliomg6103]

I'm a big fan of Gravitricity and wanted to see it on this show for quite a while. I'm very happy the time has come now and it is a great video! I don't like EnergyVault as much due to aesthetics and doubts on its practicality, but I'm eager to see how both projects (and others if there are more of course) develop and what he future holds! I hope we really see these in action sooner than later.

[@conrad2381]

Totally had this idea in Collage back in 2002. But, if you don’t put your ideas into action then it’s your own fault. Good luck to them.

[@lbronw]

Some countries have 40% obesity rate. If we eat more chicken wings, descend down the mineshaft generating energy, people automatically come back up when the food is metabolised. Tadah, repeat, it's a win win, everybody happy. Jokes aside, love your channel, very inspiring to see solutions to big problems we face in our lifetime.

[@bjarnecola6384]

I emailed gravitricity and asked about, combining it with heat-exange. Got an answer the next day. They already thinking about it.

[@beebob1279]

Sure, because you gave them the idea.

[@anders21karlsson]

Oh my. This channel is the best on KZbin. Simply excellent. Thank you.

[@JustHaveaThink]

Cheers Anders. I really appreciate your support :-)

[@snowstrobe]

They should build a moat around that tower block to drop the blocks into. The mine shaft one is certainly less of an eye-sore.

[@liamredmill9134]

Don't know if you have covered mechanical batteries(fly wheel storage)on your great series,which is another system which could quite possibly be combined with all these other systems(like an ion battery being the gravity weight,with a fly wheel).i would like to share my scale up idea for a heat battery(my own idea,with micro wave safe glass tubes(there patented invention)heating an iron filament from the sun,through the (patented glass,that by it's molecular structure,does not allow,Evan one ÷of the heat too escape.this in turn would be reconverted into electrical energy at night,by the geothermal method,or vise versa,but on a smaller interconnected systems way,a bit like solar panels.tell me what you think ( :and if maybe this could be tested,and Evan financed.freedom

[@Yanquetino]

I'm really enthralled with these developments, and will comment in Patreon. Thanks, Dave!

[@mikebikekite1]

It's been really interesting to hear about all these energy storage ideas like gravity energy, flow batteries, liquid air, flywheel, iron-air, lithium, zinc etc etc but I'd just like to see an overview that compared of these different technologies listing the pros and cons of each. Things like efficiency, storage available, cost, size, environmental impact etc. Has there been any real life comparison tests made to see how these storage technologies work in practise?

[@NiklasLarssonSeglarfan]

Simple overview is that all of the once you mentioned are far far too expensive to ever store energy on a grid scale.

[@mikebikekite1]

@@NiklasLarssonSeglarfan I'd still want to know what their cost, efficiency, storage capacity and a list of pros and cons. Pumped hydro (using gravity to store energy) seems to be used on the grid scale. Switzerland, just this week, introduced a 20GWh system.

[@NiklasLarssonSeglarfan]

​@@mikebikekite1 Yeah, there are plenty of pumped hydro around, but in general they do little more than grid stability and handling peaks, not used as baseload for days on end. And, pumped hydro has the same issues as hydro, it ruins local nature and can only be put in a handful of locations. But reading about the one in Switzerland i must say i am impressed! But even with its 2.3 bn usd it can still only give energy for 20 hours.. Its decent, but we'll probably never be able to combine renewables and batteries.

[@mickwilson127]

Brilliant content as usual, this channel is the got source for sustainable energy info.

[@matthewbrooker]

Kites on a windy day....messy but they might just work. The involvement of Cemex in the project mentioned has me wondering if this isn't just greenwash for a horrendous polluter.....I suppose only history will tell us....

[@danyoutube7491]

Presumably they are just involved for their expertise in forming the blocks; as long as the stated ingredients for these blocks are all waste products as claimed, there will be no need to create fresh concrete.

[@matthewbrooker]

@@danyoutube7491 I agree with you within the parameters of the individual project, but think bigger, more strategically - can Cemex be persuaded to find radical alternatives to their business model or is this simply the equivalent of oil companies planting trees and building one off hydrogen refuelling stations, doing just enough to keep away regulation and guidance from elected governments?

[@fireofenergy]

Cement? All construction materials will also be made with clean energy, so it doesn't matter - unless more energy is used to make whatever storage than the energy it will ever store in its life. This last metric is the ultimate limiting factor. All else is just a matter of scaling. We _still_ need fossil fuels to kickstart renewable energy and storage until awesome clean energy industrialization really gets going (like Tesla's factories in a couple of years).

[@matthewbrooker]

@@fireofenergy Conventional cement does indeed use a lot of energy, but the basic chemistry of mixing coke with lime or other carbonates is intrinsically CO² emitting. This is Cemex's basic business model - I hope they can change to using other methods, but fear they may not.

[@737smartin]

R.e. Kites...That’s energy generation, not energy storage. Even still, kites = wind turbines but much more fussy.

[@Bibibosh]

This has blown my mind My god! This is genius. I have seen alot of fantastic idea, but "dam" terrific!

[@bureboburebo4188]

Rail cars heading up and down mountains is another similar approach being explored in California.

[@jfirebaugh]

There are huge wind farms in west Texas which are surrounded by table-top mesas. A slanted rail system from the top of the mesa to the plains below could be a kinetic energy storage solution. The rock removed from the mesa to make the rail bed could be part of the moving mass.

[@Kevin_Street]

Thanks for another great video! Of the two of them, Gravitricity seems more realistic to me, since it's a lot simpler. Energy Vault sounds amazing, but it has so many moving parts with all the cables and hundreds of blocks, there's lots of ways it can go wrong. Seems to me these gravity batteries need to be big, dumb and reliable. You've got to shift lots of mass over and over again without anything breaking down, which makes "dumb" simple designs preferable.

[@magicsasafras3414]

Energy vault is a scam(at least I think) because I refuse to believe that someone is stupid enough to come up with such an awful design. Gravitricity is an actual company that actually works because the design is literally one of the simplest batteries out there and its realistic. Weight based kinetic batteries are only good at small scales. For a city you need pumped hydroelectric dams because they only work at large scales. A weight battery at it's largest would probably be the size of an elevator (though you could go bigger, the potential storage to size ratio would drop significantly). Dams need to be large because water only has high storage potential in large volume. A dam the size of an elevator would have terrible potential storage(I would say the smallest dam is a small lake but that's only going to power like a few houses for an extended amount of time). They are both good but they are meant to store power on different scales.

[@terrytytula]

Excellent video, surprised you didn't mention clocks. About an hour before I watched this video I went into my living room and pulled up the weights on my grandfather clock.

[@JustHaveaThink]

Good point Terry. Exactly the same principle :-)

[@MrWokyman]

I watched the Thunderfoot vid on this a while back, will be interesting to see the results now that they have a real world test version in play. I think he raised some interesting questions about the effect of wind on the system, in that it would lead to sway in the cables and impact the precision of the system's ability to stack the blocks. He also speculated that the blocks will slowly chip each other away at the edges which seems like a possibility. Not sure what the tolerances are in terms of the stacking? Their website is pretty heavy on the marketing and light on information.

[@laughingvampire7555]

well Thunderf00t made the video and the calculations and it wasn't useful at all.

[@CaedenV]

I love this idea. It is just so deceptively simple. Just as efficient and usable as pumped hydro, but much more compact and faster at turning around from charging mode to discharge mode. Can't wait to hear about results from these initial testing facilities. I do have some concerns about the open nature of the first example as high winds could make for a very bad day; but but a fairing around it, or throw it in a mine shaft and what could go wrong?

[@pierre-lucdoucet1179]

There seems to be a hell lot of moving parts in the "Energy Vault" system. As a general rule, the more moving part you have, the more risk of failure you have. Frictions between blocks, degradation of the concrete blocks, mis-alignments due to wind and rain on the structure, resilience to earthquakes. Those are only some points that came to my mind is a couple of minutes. The only advantage it seems to have against pump hydro is the energy density of the system but I think the constant need of maintenance to keep this system running far out weight the gains.

[@lGODofLAGl]

Other strength pumped hydro is much more limited when it comes to *where* it can be located, but otherwise I totally agree with you. The Graviticity proposal seems much more reasonable, but because it's less flashy it seems to get less attention (especially here in the comments), shame really.

[@kimsteinium4532]

true

[@MrBadbonesaw]

Agreed. The liquid redox battery is going to prove to best the best option down the road. Being able to stack shipping containers of liquid batteries and leave them for 25+ years without moving around will be the safest and least amount of maintenance. I would rather see those concrete blocks be made of carbon capture concrete and used as levees of building blocks.

[@chrislaf2011]

But this is entirely missing the point. If the world is to move to clean, renewable energy sources (as it surely must), then - as is so often pointed out - various means to store energy from times of surplus to times of high demand are essential. The fact that a given storage system may be "less efficient" in terms of its maintenance needs is irrelevant. No one denies that there are problems that will need to be overcome; but the big picture has to be looked at. Why be negative? Why not try to see the positive and the potential?

[@MrBadbonesaw]

@@chrislaf2011 it all comes down to 2 major factors 1: cost per megawatt storage 2: renewable materials that are abundant and nontoxic. Gravity storage has the material part figured out but the cost per megawatt is probably 2-3x pump hydro and loss of efficiency and maintenance. This project might be fine for R&D but I believe redox batteries will be a far better investment. It will eventually have a low cost per megawatt and be made from non-toxic materials that can be recycled after their 25+ year lifespan. They can also be stackable to fit into major metro areas where space is a major cost premium.

[@gwitichis1]

there is also a thing called ski lift. Which is quite common in the alpine region. This thick wire cable weight lifting infrastructure is when idle a candidate for gravity energy.

[@thtiger1]

Thunderfoot poked a lot of holes into this concept.

[@seanhoare7639]

That's his claim to fame though.. A real downer man.. Except a lot of his holes are not well, quite, well PROVED !

[@thtiger1]

@@seanhoare7639 He made some good points on the cost benefits. You use more power than you get back. Gravity power is nothing new. London had a whole hydraulic power grid back in the last century pre-electricity powered by the same basic concept. A very heavy weight compressing water which was then piped to several blocks of industrial buildings. I believe it was elevated by steam power.

[@seanhoare7639]

@@thtiger1 The point is that the power you use is NOT required at the time it was generated so the choice is lose it or use it!

[@thtiger1]

@@seanhoare7639 But you need to get a return on your investment. A money pit does not do the trick. I can't do Thunderfoots arguments justice here, but he makes some very good points about how viable this is.

[@seanhoare7639]

@@thtiger1 If a return on investment was the ONLY criteria (& it seems money does talk) then I would agree But there are other societal / ecological benefits to be had or we could just waste the excess power.. As a species we seem to be very good at waste!

[@michaelmcclafferty3346]

Fascinating, what a brilliant idea. What a great use of old mine shafts. Thanks for an informative video.

[@MukhaMisra]

Will the heavy blocks moving up and down be stable enough in a windy place. Plus too many moving parts

[@rupert7565]

And I wonder if it can survive a single earthquake.

[@MrBizteck]

Danmit I just commented the same ..I should learn to read the comments first 😂

[@BatteryOnBoard]

I suppose it could be a part of a multi-prong system where wind turbines are employed in windy conditions and surplus wind energy used to stack until such time as it becomes dangerous to move cranes.

[@rupert7565]

@@MrBizteck To be fair youtube does not make reading it's comments easy.

[@stevesedio1656]

@@rupert7565 Especially, when the comment is in the replies. A search feature would be nice.

[@Andrew-ep4kw]

The open blocks and cranes system is interesting. It's advantages is it can be located anywhere you can construct a tall heavy structure, along with all the performance advantages of gravity storage. Once weakness I see is wind. Construction cranes usually are not operated in windy conditions for obvious reasons, and since this system is essentially a group of construction cranes moving blocks around, that will be an issue. One solution is to encase the entire system in an outer structure.

[@matthewknobel6954]

Old clocks used to use gravity weights.

[@michaelgian2649]

Big Ben?

[@raykent3211]

Yes, it's a very efficient form of energy storage.

[@epiccollision]

@@raykent3211 no it isn’t, it’s just useful for clocks...

[@raykent3211]

@@epiccollision à planet following an elliptical orbit is described as converting to and fro between gravitational potential energy and kinetic energy. This must be lossless or it would have lost energy and crashed into the sun before I was born. So, 100% efficient, pretty much by definition. So, per se, the conversion from gravitational potential to kinetic is lossless. Losses are incurred elsewhere, such as friction in gearing, which can be minimised. Yep, mate, the principle those old clocks are based on can be hyper-efficient.

[@elonmask50]

@@raykent3211, interesting in theory, but fails in practice, the human has to convert food into energy in order to lift the weight once a day to power the clock for only a day, the self same clock can run for better than 12 months on the chemical energy in a single 1.5V carbon / zinc cell. Even in the “Matrix” that’s wasteful.

[@anthonyfletcher4250]

Well articulated without the need for technical jargon that is off putting to the layman. l think it is a great idea to encourage the crafts, especially the use of sustainable timber to replace our present reliance on plastic, steel and concrete.

[@oisiaa]

The energy capacity is WAY too low for how complicated they are. Pumped hydro is the clear winner since you can store millions of tons of water very easily.

[@Pants4096]

It's not one-size fits all. If these technologies can be optimized to be cost-competitive, they'll play a role in a comprehensive grid-level storage solution. A win no matter how you look at it.

[@ragerancher]

Pumped hydro has a far lower energy density and would actually take as more material to make than an equivalent capacity system. It also has large ecological effects and can impact across national lines (eg the damming of the Nile). These systems also provide a potential use for otherwise waste construction material.

[@anonuser12345]

Pumped hydro can't be built everywhere. People will need different solutions for each situation. In the plains/prairies, there is no suitable landscape for pumped hydro.

[@guringai]

PH is only good where there is plenty of water & suitable geography. That excludes large parts of the planet

[@Gilespargiter]

Good to see that type of system being developed. It also of course has zero energy loss for longer term storage. I think you will find it has been used to drive clocks for a great deal longer than a century.

[@per.kallberg]

And the clocks got somewhat smaller when the transition to batteries was made 😂. Take that as a clue to the feasibility of these project.

[@lakpabhutia3554]

Okay, now you should watch thunder foot debunking this technology. 😂

[@peterbrickwood3204]

Please post a link.

[@lakpabhutia3554]

@@peterbrickwood3204 kzbin.info/www/bejne/hHrLdKiwrbOprJI

[@nicholaskelly6375]

It has been seriously proposed to build this type of system using disused deep coal shafts on Upper Sielesian Coalfield in Poland. Also it has been suggested to use the abandoned shafts in a pump storage hydro system. With a combined water turbine generator/pump system at the bottom of the shaft. Note these shafts can be upto 1100m deep.

[@Bibibosh]

It's basically a massive grandfather clock.

[@thtiger1]

I had a think, and I realized that town water towers are actually gravity storage systems. You pump water up into a tank high in the air, and it creates water pressure for the town water supply. You could run the outflow from the tank through a generator into a pond to create power, and pump it back up from the pond to the tank to store energy. Far fewer moving parts than lifting big bricks, and no worry about outside forces like wind interfering.

[@Bavvo69]

A tiny amount of energy storage though. All these gravity systems need a combination of high mass and a large height differential to work, you don't get a lot of energy otherwise.

[@IvoryOasis]

Another idea is a buoyancy generator. Basically make a giant steel vessel that you can pump air into and out of .... fill it with water, it becomes as buoyant as the weight of the steel container (so make it heavy) and can sink down as far as the ocean goes generating energy. Then when it gets to where you want, pump in air and repeat.

[@mikegraham7078]

Ivory - The drawbacks, here, are a loss of mass due to the weight of the water (i.e. you need a lot more mass of steel to get the same 'weight'), the hoses for the air, and the marine environment.

[@johnburns4017]

Great idea. But, seawater will corrode it quite quickly.

[@IvoryOasis]

@@johnburns4017 I don't know about quickly. There are a lot of long term marine structures. Could also make it out of things like ferro cement (cheaper).

[@IvoryOasis]

@@mikegraham7078 Yup, it would have to be large enough to be worth it. And then the cable / chain would also be an extreme weight consideration.

[@michaelrenper796]

Complete bullshit. You get the same energy by just keeping the vessel on the ocean floor an letting water flow in. Compared to said concept you idea has only disadvantages and lots of them for no obvious benefit. The later concept is being investigated but is not terribly economical either.

[@CaedenV]

yes! Been looking forward for this to be covered!

[@GilesForrester]

The Victorians knew this... did you ever see the inside of a grandfather clock ? Two lead weights on cords runs the clock for a week before you wind them up again...

[@rogerbarton497]

Well before the Victorians, the bloke who made my grandfather clock (S. Lawson) died in 1770

[@GilesForrester]

@@rogerbarton497 thanks , I'm no historian !

[@gw7754]

Hello Dave, I was the guy who suggested that you address gravity storage batteries way back when a few years ago. I appreciate the quickness of these designs, which I never thought of (not a battery specialist, just an engineer). Anyhoo, my concept was to build simple gravity storage system in a modular fashion - a single one doesn't do much but you can easily construct lots of them. You have the on ground collection source of water, with the downhill component lying underground (to minimize evaporation and deal with places that might experience an earthquake). Then I thought that why not just power the pumps to move the water back uphill with renewable energy sources in the form of solar panels and wind turbines. If it should be not too sunny and not too windy then pumping the water up will simply take longer - just meant to be a baseload component in any case - fire up the natural gas and god forbid the coal-fired power plant instead, should you need it. I even imagined that channels could feed the above ground portion of this system, and also why not line the channels with solar panels? Would keep them clean and you've got more solar panels to assist if there's plenty of water filling the channels, reducing their effectiveness) to the above ground reservoir. Wind is wind and let it blow. My final thought involves charging Lithium Ion batteries, they are the ones for quick response, not the system itself. However the sheer quantity of LiOn batteries required, even in a modular approach is likely to be immense. Well at least you can charge them for free.

[@JustHaveaThink]

Hi GW. Sounds like you're describing a system very similar to Pumped Hydro. There is definitely an important place for that in the mix. All the best.

[@yggdrasil9039]

Maybe Energy Vault can paint the blocks in bright colours of the rainbow, to imitate a children's toy and make it a bit post-modern.

[@matthiasf.1869]

I like your public relations kind of thinking 👍🏻

[@kaitlyn__L]

That could certainly be a way to improve the public's receptivity to such a project and reduce NIMBYism. A rainbow, or some mural about the local area, so they can get excited when it's close to being put back together in the right order.

[@ShawnDickens]

@@kaitlyn__L they would need two and have the blocks turn so the correct side is showing for each stack. Where something like a curved rainbow would just reverse in the other stack.

[@niallrussell7184]

a Tower of Hanoi variation might work! 😂

[@petterbirgersson4489]

I leave a comment for the algorithm. I really love how you are creating an online library for descriptions of both energy storage systems and energy generation systems. Keep up the good work!

[@Ssyphoned]

can this be integrated into elevators and cranes like alternators for the building/vehicle?

[@OMGAnotherday]

Good point, I live in an apartment block with lifts, the energy could be used for the communal area lighting at night.

[@alexhu6422]

it already is. at least here in austria. they reduce power consumption but are just viable in some big apartment buildings. www.otis.com/documents/256045/6552829/Regen_Drive_UK.pdf/f470aba1-af7d-b4b3-ecc1-547c2984fbf1?t=1591127484167

[@SkaterJanF]

Modern elevators, cranes trains do operate using this principles: if it is possible a lift will generate electricity and put it back in the grid. Same goes for trains and cranes (at least for the modern ones).

[@scottarmstrong5607]

Yup they already do this. But gravity on earth is very weak so there is not that much energy that is possible to be stored in such a system. Now if we built elevators on the sun, we could store a lot more energy!

[@SimonAmazingClarke]

I love the diversity of inovation. If you could raise and lower your house by 1 meter that would help most households cover their peek energy needs. Obviously a ramp would be required to exit the house.

[@b43xoit]

And when the house is up, you could peek under it.

[@markchip1]

With all due respect to you & Energy Vault, this scheme has been torn to shreds on Thunderfoot's channel! Rail systems on longish slopes are far more practical.

[@Leopold5100]

you need to find more comprehensive sources

[@alexhu6422]

@@Leopold5100 just watch the video its pretty clear from an engineering point of view

[@JustHaveaThink]

Ah..Thunderf00t...bless him, and his nihilistic depression-fest channel :-)

[@alexhu6422]

@@JustHaveaThink ​ haha good point, i also dislike his attitude but its still fun to watch and he is right about most things he debunks :) i like your channel ! energy storage is a huge topic with lots of different possibilities. Im very interested in flywheels

[@manpetepetrop8034]

​@@JustHaveaThink But still his criticism is valid, if you take some time to watch the video, i too very often find many errors on his videos (sometimes making mistakes in his calculations - or using too much hyperbole, or self rightfulness). But his "busted" series is most of the times on the spot exposing charlatans and scammers alike, to people that lack basic science and engineering education - esp. those that drink too much of Green Tech Kool-Aid, and believe that for every problem there is a simple (or should i say simplistic) technological solution. There is a rule for exposing such scammers (that take advantage of people's real worry about climate change, and taking their money and run), if you only see from the beginning animations and no working prototypes, promising extraordinary things on performance, durability, longevity never mentioning anything negative or technical hurdles then... sniff sniff i smell a scam.

[@pattirockgarden4423]

So many great designs & systems to produce alternative energy!

[@edcranium500]

Maybe we could all have a shaft in the garden. No pun intended.

[@bibliotek42]

Again, a very exciting video. We should put lithium in thinks where we can't use other things. These less polluting energy storage solutions are surely much better for the environment than big battery centres.

[@bmlbigbang]

That's really encouraging and indeed something I wanted to explore mathematically for economic feasibility. Do you know how well each energy storage technology will compared among the many that we have explored so far?

[@channelwarhorse3367]

Go constant clean energy 🌟 drive.google.com/file/d/1bvjs-U307TGyz1z6AUsZ9oZiG4u_x4Ev/view?usp=drivesdk

[@channelwarhorse3367]

Encouraging to who...what do i care, treason hang me, what do I care, clean energy technology 💪. Be the Greatest 👍 drive.google.com/file/d/1--MtSpDpex-zxEcPFOw0EQxVcWcaAk1O/view?usp=drivesdk

[@bmlbigbang]

@@channelwarhorse3367 encouraging for humanity.

[@channelwarhorse3367]

Grind up clean energy technology before we all oven out, Baker Love 💘. Baking bread is easier then peace ✌ kzbin.info/www/bejne/rKPJZ6ycesRkbac

[@channelwarhorse3367]

Energy is meant to be utilized, stored is for what?

[@PNurmi]

My assessment is the mine shaft would be the better system than the tower system since high winds and other severe weather would not affect it. Thus, the mine system would be more responsive during such times of severe weather. Plus, I would be concerned about the heavy blocks falling during a storm so that the tower operation would have to be secured for storms and thus not available when most needed.

[@tcroft2165]

Low wind profile high weight not really a big issue. Earthquakes are more real risk.

[@eddydogleg]

6:30 "They claim a 50-year design life -with no cycle limit or degradation" Sounds like marketing wank to me. I've worked with 450 tonne (1,000,000 lb) cable hoisting systems and sooner or later the cable will have done enough work that some or all of it will need to be replaced.

[@elipson1]

I don't think they mean "without maintenance". I think what they mean is that after 50 years, it will still produce the same quantity of power as when it started. For example like how batteries degrade over time, even with proper maintenance. It was an odd statement either way, like the 90% efficiency claim also....

[@anonuser12345]

Obviously the system will require routine maintenance. The statement was "no cycle limit or degradation" - which is accurate to the system as a whole, but not every single piece of equipment in it.

[@AndreSomers]

@@anonuser12345 That would be the same for battery storage though. You can exchange the cells, the system as whole remains.

[@aces4863]

Another cool idea would be to use old oil platform rigs in the gulf to lower weights from with a buoyant attachment so the waves could raise them. The waves could pick them up and gravity pull them down. With that system you’d have no loss of power in having to pick your weights back up.

[@techloidtech2051]

I prefer my term "Kinetic Energy Storage" lol. Should have been doing this kind of stuff decades ago.

[@zerpollo]

That's potential energy, though. E.g. the Flywheel energy storage is a kinetic energy storage system.

[@davidvondoom2853]

It's existed for centuries, just never applied large scale.

[@deathbyproxy2]

As a human being and a member of the Human race! I love nothing more than the way he delivers unbiased impartial information. Without bringing race religion or nationality into it!

[@steevesdd]

The liquid metal batteries promise a high efficiency , high cycle life grid storage option that is un restricted in deployment.

[@incognitotorpedo42]

How do they compare in fully amortized cost to the gravity storage described here? Gravity is claimed to be 4 cents per kWh, according to the video.

[@adolfodef]

@@incognitotorpedo42 We should combine this systems for grid frequency estabilization & baseload grid filling. . The gravity storage contains huge ammounts of energy, it can "blackstart". . The liquid metal batteries requires heat to keep themselves "liquid" (so in case of a failure it shutdowns & needs a lot of input of energy); but while they are operational, it is more efficient. -> Combined with liquid air storage (the heat reservoir in/next the liquid metal batteries), there is a thermodynamic sinergy [plus allowing different ways to charge/discharge].

[@steevesdd]

@@incognitotorpedo42 my understanding is that it is cheaper than pumped hydro.

[@steevesdd]

@@adolfodef as part of a grid , it would be expected to have multiple charge and discharge cycles daily. The longer that a liquid metal battery is expected to hold a charge the less efficient that it gets. This technology is for frequency regulation and short term power storage for 1 or 2 days. But that is exactly what is needed for solar and wind farms or grid scale frequency regulation.

[@JustHaveaThink]

Hi Drew. We'll be looking at those in the next video.

[@jamesag4135]

Love this channel.

[@jowjor]

PS power stations are using thousands of tons of water with hundreds to thousands of meters of drop height. And they are far from enough to store energy from renewable sources. In France, we have water and mountain, so we use relatively speaking a hih amount of hydropower, and we mainly use them to regulate the power grid (but only 18% of our hydropower is PSPS so maybe we have some margine to improve on storage). now, if we replace PSPS by a mass of heavy steel, with a density of 8, we'd need 1/8 of the surface of a lake at a few hundreds of meters to generate a comparable energy. 1MW of power output for 8 hours, so you'd need 4 of them to simulate 1 medium size wind turbine, and 8 more if you want electricity for a full calm day. That's a joke. We are seriously looking at batteries. because it's more feasible. Potential and kinetic energies are weak. Chemical energies is 100-100 times more concentrate. And then nuclear energy is again 100-100 times more concentrate. Potential energy= mass*height*g, physic is a bitch.

[@davidvondoom2853]

I guess you also have to factor in the costs and lifespans of chemical batteries, vs these batteries made from recycled materials with potentially longer lifespans.

[@bimblinghill]

I think it's unrealistic to think of the energy vault as a mass storage device like pumped hydro, for the reasons you say. I think this would be more of a competitor to the sort of load-balancing that those new Tesla grid batteries do, with quick response but relatively short charge/discharge times.

[@PinataOblongata]

How quickly and cheaply can you dig a hole compared to building a nuclear station?

[@PinataOblongata]

We could fit about a thousand of them in one open-cut mine.

[@jowjor]

@@PinataOblongata Good thing you can fit a thousands of them if you want that instead of a nuclear power plant (even if they don't serve the same purpose), because at maximum power of a few MW you'd need 1000-6000 of them to replace a single thermal power plant, only to have same power output, but not the same energy output. And you don't produce any watt if you don't have an equal energy input beforehand so you still need a source of energy. Now, is it still cheaper and faster to build 1000 overbuilt clock weight like this, and his power source like 250 windmill, or 1 single thermal power plant, being nuke if you like it?

[@ianjenkinson3585]

While using old mine shafts sounds like a good use for an old mine there are several problems. It was always claimed that the deepest shaft in Britain (and perhaps western Europe) is at the Wolstanton Colliery in North Staffordshire. The shaft was (still is because its only capped off) 1265 yards deep (that's how they were measured) or over a Kilometre in depth. It had three 3,300 hp winding motors so its not unreasonable to suggest that "all things being equal" it could generate 3 x 2.4 MW or 7 MW of power. However two things, firstly the mine had to be continually pumped to remove groundwater (and they were huge pumps). Secondly, Wolstanton like every other mine in North Staffordshire (except Chatterley Whitfield) has been redeveloped and now has an M&S superstore on the site.

[@davidsharpe7869]

What about useing the tyde to lift heavey weight twice a day.

[@yggdrasil9039]

You can use the tide to capture tidal flows at high tide and then gradually release them to generate power, so long as you have enough water and a decent difference in water levels.

[@romuloramosdias1137]

There's a system called tidal lagoons. They do basically this

[@yggdrasil9039]

@@romuloramosdias1137 Good idea. Where are they currently in operation?

[@romuloramosdias1137]

@@yggdrasil9039 there are many of those in Europe, but I don't remember exactly where. There's a video explaining this

[@richardservatius5405]

imagine a mine shaft and the waste pile nearby. this energy storage system has an automatic dumping system located way above the shaft bottom. electricity hauls waste rock to the shaft and puts it on a big tray. when electricity is needed, the tray drops and dumps the waste down the shaft, then comes up empty, ready for another load.

[@bamiebal6242]

I really love your work but energy vault is not a grid scale solution and actually a dumb idea. You need to move much larger masses to make gravitational storage viable 500T doesn't make a dent on grid scale. Liquid air is much more viable and less of an eyesore especially if you put them underground.

[@rudylikestowatch]

@@wishmasterbrazen Link here: m.kzbin.info/www/bejne/hHrLdKiwrbOprJI

[@lamajigmeg]

Another great video my friend thank you very much I’m going to share it with all my engineer buddies

[@JustHaveaThink]

Cheers. I really appreciate your support. All the best.

[@torbenalstrup3902]

I wonder who is tidying up in his shed after that tool box attack :-)

[@kasimirb5155]

Good idea. Such a contraption can be built anywhere.

[@davidtindell950]

Thank You Once Again ! Happy New Year 2021 !! BTW ... the proposed “Space Elevators” could also serve as gravity-based generators !!!

[@Rezac66]

Amazingly interesting as always! Thanks!

[@michealoflaherty1265]

I really need someone to check my math(s) here Potential energy = m g h So 25 tons over a 150m mine shaft P. E. = 25000 x 9.81 x 150 P.E. = 36787500 J (sounds good) Or 10.2kWh Or ~1 €/£/$ of electricity. Not so good. A little more than 1 Tesla powerwall. Not a great return for a hefty crane hanging over a very deep hole. Would appreciate any corrections

[@PaulMansfield]

Looks right. This is why gravity storage needs such large scale.

[@michealoflaherty1265]

@@PaulMansfield At least I'm not going mad. Pumped hydro works because you have huge amounts of water. You would need enormous amounts of concrete and pulleys and motors that need to work under enormous loads for large amounts of time. Doesn't add up for me.

[@JustHaveaThink]

Sounds like you're referring to the gravitricity site. That one is only a small scale demonstration. They will be far larger at full scale and have multiple weights in multiple drop shafts.

[@michealoflaherty1265]

@@JustHaveaThink Thanks for your response. Day made 😊.

[@Borishal]

Small scale version of this could be developed for isolated area. Individual properties could have weights raised during the day, and released during the night. The weights could be any local material.

[@gerardvila4685]

Exercise: Find out the energy storage capacity of a Tesla power wall. Design a gravity storage system with the same capacity that would fit inside a house.

[@yggdrasil9039]

You'd put it outside the house. Maybe at the end of the house where the chimney used to go?

[@nerdy1701]

To have the same energy storage capacity of a tesla power wall 13.5 kwh you would need to drop a chuck of concrete that weighs 1 tonne almost 10 meters. Not practical in my opinion.

[@gerardvila4685]

@@nerdy1701 Thanks! If we assume concrete has density 2 (actually it's 2.3 approx) then a tonne block would occupy a volume of 50 x 100 x 100 cm. 10 m is 4 storeys each 2.5 m high; a typical detached house would more likely be 2 storeys, or 5 m high. You could store the same energy by doubling the weight and halving the height. So you could have 4 half-tonne weights 50 x 50 x 100 cm (or cylinders, like clock weights) going up and down the whole height of the 5-metre house. If you spent a little more money on the weights you could buy lead ones (density 11), and either shrink the actual weight or weights, or shorten the height about 5 times, so you would only need about a metre instead of 5. In conclusion it doesn't seem impossible, just cumbersome - the best solution might be to build a dedicated tower, either up against the building to give it a medieval look, or free standing like an Italian bell tower.

[@alandalsing522]

@@nerdy1701 I have 4 tonne in cars sitting in my garage every night...2.5 meters might be feasible...

[@yggdrasil9039]

@@gerardvila4685 Great idea.

[@glenmcd]

I'm the inventor of "drag negation". I think there are many possibilities using the weight of the ocean itself as energy storage. Some years back I thought of giant balloons on ocean floor, filling and then using escaping air pressure to drive generators. But perhaps something with higher efficiency would be a vacuum chamber at depth with variable volume (piston/cylinder arrangement). Water seals at 500 atmosphere pressure might be difficult but if possible, would be an excellent giant battery and if anything goes wrong, there's no humans around to injure. Glen McDiarmid.

[@yxmati]

Hi! Usually I quite enjoy your videos, however you obviously have overlooked a few things in this one. The issuw with gravitational energy is, even though the energy stored in a contraption like EnergyVault's tower idea seems much to our intuition, a few simple calculations show that is is not the case at all. Just assume one would build a tower of 100m height & diameter of 20m, and all the space is filled with such concrete blocks. The mass of this tower would be 2000kg/m3 * 10^2*pi*100 = 62.800t. Multiplying that by an average height of 50m & gravitational constant 9.81 results in 8.55 MWh of energy, assuming an efficiency of 100%. Comparing that to a system like Tesla Powerpack (172.000$/0,232MWh) it would cost 6,3 million dollars. Now using an average price of 300$/m3 of concrete, just the concrete alone for building the tower would be 9.4 million dollars, no cranes / electric equipment installed. Even with battery prices today, concrete gravitational storage is not able to compete.

[@nerdy1701]

That's what I have been trying to tell people in the comments! It works in theory but is definitely not practical!

[@JustHaveaThink]

Just for clarity Matthias (and to dispel what appears to be a popular misconception among several commentators this week) - I did not personally create this technology (or any of the other technologies that I have reported on over the last three years) , nor did I start the company called Energy Vault, so it is disingenuous to suggest that there is something inherent in the design that I have overlooked, becasue I had absolutely nothing to do with designing it. My role on this channel is to report the work going on in the world of sustainable technology. I can however confirm (as I mentioned in the video) that there are 6,000 blocks in a typical Energy Vault configuration each weighing 35 tonnes, so my maths tells me that is 210,000 tonnes. I also suspect that many structural engineers and scientific developers will have worked quite hard over many many years to ensure that they have carefully calculated precisely what the towers can and cannot do. Without these numbers it's unlikely they would have attracted any funding or been allowed to build the tower in Italy.

[@yxmati]

@@JustHaveaThink Thank you very much for giving such a detailed answer. You are absolutely right, it'd be impossible to grasp every detail & look behind every technology you present here on this channel, even for people with an engineering degree or who work in the renewables sector as the spectrum of renewable technologies is so broad. What my comment referred to is that many people have a similar view about concrete based gravitational energy storage, you'll probably find a view videos on youtube or articles that are dedicated to such contraptions which look at them rather critically. Nevertheless, please do not get me wrong: I really appreciate your work, we need more people like you who translate engineering language into common English and convey struggles we face at de-carbonizing our society & implementing renewables and their possible solutions as (at least from my point of view) increasing awareness is an utterly important issue. I just would have been very delighted if you'd have included a few critical voices in your video. Concerning the calculation, the price per MWh is only a function of height so the absolute mass is irrelevant, I thought I'd demonstrate it with a small example so that it is easier to understand. Additionally, there are many other costs to consider (like maintenance and generally high OPEX) which I did not mention in order to keep it simple. As far as due diligence by investors like Softbank is concerned, I personally doubt that they did thorough research as they would not have invested that much money into a very controversial technology it they had done their work properly (at least I hope so). It wouldn't be the first time that investors are misled / conceived by some revolutionary newcomer company.

[@bobwallace9753]

A problem with raising and lowering blocks as shown in the video is that 'not all blocks are equal'. As the system moves to lower blocks in the stack there's less energy to be recovered from the block. The block has less distance to fall, less energy was used to raise it to its lower position in the stack. In a 100 block high stack some blocks store 99 units of energy, the second from the bottom block stores 1 unit of energy. The bottom block stores none. Mount the crane at the edge of a cliff. Install rail tracks at the top and bottom. Raise and lower "rolling weights" and move them from the crane to storage areas. We should have an abundance of no longer needed coal rail cars. Fill them with something cheap like waste concrete. Slope the lower track away from the crane. When recovering power from the system let gravity move the lowered weights/cars. Then when there's power to be stored store some of it as travel to the crane. At the top do the opposite. Move weights up a slope when there's power and let gravity bring them to the crane during discharge periods. Huge amounts of energy could be stored by simply making the storage tracks longer and increasing the number of cars/weights. All cars/weights store 100% of the energy needed to lift from low to high.

[@JustHaveaThink]

Hi Bob. Sounds like you have a plan. Might be worth talking to investors.

[@cienciabit]

Giant overhead crane is more scalable than a tower. Imagine 1 km track.

[@jimbanda]

HELP 💥 I am not an engineer, but I have always wondered how the maths of this question goes..., How does the gearing work in a situation where I could have a 10 tonne weight , 100yds height , be falling slow enough to run a 1kw motor for "X" amount of time. Love some suggestions ❤️👍

[@per.kallberg]

@@jimbanda start with investigating what rpm the generator needs. Perhaps 3600 rpm. This is 60 rounds per second. 1 kW is 10 metric tones falling 1cm/ second. Now you know that 1cm needs to become 60 rps. With a 20mm generator gear you get approx. 60cm per turn. So 1cm need so become 3600cm thus your gearing needs to be approximately 1:3600 or 3600:1 depending on how you view it. You need a generator with lower working rpm but the theory is the same.

[@danarves7452]

For an approximate calculation, 100 yards = 91.44 metres Gravitational field strength = 9.8 The potential energy of 10 tonnes at 100 yards height is mass x height x g.f.e = 10,000 x 91.44 x 9.8 = 8.9 MJ = 2.5kWh So the gearing required for 1kW would drop the weight 91.44m in 2.5 hours The velocity of the weight would be 91.44 / 2.5h = 91.44 / 9,000s ~ 0.01 m/s For a winch drum 500mm in diameter, the circumference, pi x 1/2m = pi/2, would need to rotate once every 157s or 2.6 minutes which is 0.38rpm The gear ratio required would need to match the ideal speed of the motor or dynamo to the drum rotating at 0.38rpm so for example 1:1000 would give a motor rpm of 380 Please check figures and adjust to taste :) Various factors such as friction and amount of cable on drum will come into play too

[@per.kallberg]

@@danarves7452 nice calculation and presentation! Please note that Dan’s energy equations gives you the answer to the feasibility of the project. A battery with 2,5 kWh weights 10kg and cost 400$.

[@nerdy1701]

@@per.kallberg it does the opposite in my opinion. 10 tonnes of concrete costs ~1400 dollars to store 2.5 kwh. That's just the mass. Then you need a structure that can hold 10 tonnes of weight all while moving it up and down in a secure way. Lastly the tower has to be 30 stories tall! All to store 2.5 kwh

[@gebys4559]

Energy vault is an absolute pipe dream, blocks will degrade over time and try stacking them in windy conditions.

[@peterkratoska3681]

Here is a critique of the Energy Vault by Thunderfoot - he's a little over the top at times but raises some pretty good points. Pumped hydro is definitely costly but it is also gigawatt scale. I think Highview Power liquid air storage system (mentioned briefly and in an earlier video) is far more practical. kzbin.info/www/bejne/hHrLdKiwrbOprJI

[@ElElGato1947Gato]

Thank you, Dave, for yet another wonderful video. I really enjoy how you explore new options & new directions. Your videos enrich my lockdown experience.

[@JustHaveaThink]

Cheers Anthony. I'm delighted to hear they are of some use. Thanks for your support. I really appreciate it. All the best.

[@ristekostadinov2820]

Please make a video about earthships.

[@rogerbarton497]

There's no current leakage losses either as with chemical batteries. You could have a mechanically linked wind turbine, or a water turbine to lift the weights so combining storage with generation. Mechanical generation directly to mechanical storage would eliminate the mechanical to electrical to mechanical losses.

[@michellelewis3063]

One needs to be a little more critical of ideas. Pumped hydro is also gravity storage and even a small system has far more mass in the mgh eqation than many of these full scale tower systems. Water is essentially free and does not have to be made into blocks. There are a great deal of additional mechanical and structural elements which need to be made, maintained and replaced which pumped hydro does not have. Cranes don't function well in high winds, which is exactly where the wind turbines will be.......Let me give you a far better idea if hoisting a manmade mass is insisted upon.....do it by increasing h, where is the greatest h? from a floating platform dropping many miles to the ocean floor........so the platform can generate the energy from wind, solar and waves and store it. It can even then provide energy for shipping and become fuel stations for clean international bulk transport......you're welcome :)

[@mikegraham7078]

Michelle Lewis - I agree the tower seems a bad idea due to the winds. Bad weather could also cause problems with a floating platform, and how do you keep it anchored in place if it is 'many miles' above the sea floor? Having the machinery in a marine environment also causes ugly problems with corrosion. I think the underground solution seems the best out of this bunch. As for pumping, I think there would be efficiency loss in pumping as opposed to lifting, and there would be evaporative loss as well (which may be at least partially offset by a free increase in power due to rainfall). For a system that is meant to bolster the grid for peak use times (i.e. acting like a capacitor to keep the draw smoother) I think pumped mass can work reliably, but the space required and the amount of maintenance would be greater, for certain, and the wire-hung-mass methods. Again, the weight hanging underground seems the best to me. No salt, no wind.

[@michellelewis3063]

@@mikegraham7078 Its just generally a poor idea Graham, its been around for a very long time and has many fundamental principles against it. While like all technologies, it may have some applications in some locations it is not the global solution the developers tout it as being.

[@kkarllwt]

Set up one of your ideas in Iowa, or, Indiana or, Illinois. States with 400 feet of difference in height.

[@michellelewis3063]

@@kkarllwt I didn't know there were oceans in Iowa, Indiana and Illinois...

[@rjung_ch]

I've heard of this Ambri project, sounds amazing. Prof. Donald Sadoway is involved. Also this Gravity storage system from Energy Vault you mention in Switzerland is a big deal, many people here are talking about it. I'll go visit it very soon. It's only 2 hours drive away from where I live :-D Thanks for your great show Dave!

[@stevesedio1656]

I've been following Don for years. He has the right idea how to solve battery storage for grid (when size and weight are far less important than total cost).