As a reminder, pumped hydro is the gravity storage solution that actually works, unlike sand, elevators, and hillside rail systems.
had, between the Loch Ness Red John facility selling to Statkraft, the UK finally settling on cap and floor for the technology and China having 365 GW of power and 4 to 8 TWh of energy storage under construction, I included a throwaway line.
A panoramic image depicting a surreal scene where a large block of cement is hanging in mid-air above the Earth created by ChatGPT and DALL-E. Multiplication like this is taught in Grade 5. The physics of potential energy due to gravity is taught in Grade 7. If at any point this is a bit tough for you, ask a 13-year-old to help out.
For those unfamiliar with metric, that’s close to the length of an American football field, but straight up and 2,200 pounds. To boil a pot of water. Electric cars are really efficient. Let’s load the rail cars up to the maximum 130 metric tons for heavy freight rail each. Let’s use relatively standard 18-meter cars. Let’s use 50 cars for a decent length and mass train. That makes it 900 meters, almost a kilometer long.
There are funicular railroads that go up steeper pitches, but they have vastly less mass because the strain on the cables gets so high that they snap. Shorter distances up steeper slopes involve similar heights but vastly less mass, so energy storage drops by one or two orders of magnitude. Nah, I’ll just do it. They range from 40 to 50 meters. If you’ve read this far, your spidey sense will be tingling already. That’s just not that much. What about mass? On average, about 3,800 metric tons of water. Well, your spidey tense must be ringing alarm bells right now. But still, let’s do the math. Let’s give it a break and assume a 50-meter water tower.
But wait, there’s more. Why do water towers exist? To provide water pressure to communities so that water actually comes out of taps and fire hydrants when needed in sufficient volumes. What is water pressure? Energy. Oh, wait. If we take all of the energy out of the water as it comes out of the water tower, that means there’s no energy left for water pressure. Dribbling showers and firehoses are no fun at all.What haven’t we ripped to shreds with Grade 7 physics yet? Oh, yeah, mines and sand.
So this is clearly a deeply stupid idea, and yet I’ve seen people who seriously propose it. The inefficiency is off the charts, and just imagine even autonomous electric front-end loaders driving constantly through a dust cloud of smaller sand particles, which gets in their gears. Sand has a density of about 1,600 kilograms per cubic meter. That’s about 5,000 tons of sand. Hmmm. Do we have winches that can lift 5,000 tons? Errr. No. That’s almost exactly ten times bigger than massive winches for deepwater construction. Okay, let’s pare that back. Maybe 1,000 tons of sand? Cut the depth to two meters instead? Sure. Let’s do that math, once again, for this fictional, huge, water-free, deep mine shaft, one of which might exist in the world.That isn’t very impressive.
They think that at night, big dollies of heavy stuff can be shoved into freight elevators in the basement, lifted up to the 75th floor, and rolled into executive offices and board rooms, then in the morning, dropped down again to generate electricity.Okay, let’s make believe for a bit. How much weight can office building freight elevators lift? Big ones can manage 9 tons. What’s that sound? The sirens of spidey sense whooping. What’s that noise? The multicolored lights of spidey sense flashing.
A panoramic image depicting a surreal scene of a gigaliter of water contained within a gigantic transparent bubble, suspended 400 meters above the ground created by ChatGPT and DALL-E. Math, though. Let’s pick a 500-meter head height site. Let’s pick a billion liters of water, a gigaliter weighing a billion kilograms, a million tons. Wait, what’s not happening? Your spidey sense isn’t flashing lights and blaring alarms. These are big numbers on both sides.Oh. GWh. Significant grid storage. Okay, now we’re talking!
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