As a somewhat aside, I always find gravity storage numbers a bit silly.
The figures on page 11 have it as 20-1000MW for up to 15 hours. That's 300-15,000 MWH. 10,000MWH is a nice middle ground.
To lift 1 ton 1m takes 9,800 joules. Which is about 2.7WH. Not very much. Your phone battery could list about 6 tons by 1m.
10GWH would take 3.7 million tons up 100m. That's 10 Empire State Buildings, lifted a quarter of their own height. Managing all of that seems like a titanic task. I can certainly understand why water is so much easier to manage.
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The figures on page 11 have it as 20-1000MW for up to 15 hours. That's 300-15,000 MWH. 10,000MWH is a nice middle ground.
To lift 1 ton 1m takes 9,800 joules. Which is about 2.7WH. Not very much. Your phone battery could list about 6 tons by 1m.
10GWH would take 3.7 million tons up 100m. That's 10 Empire State Buildings, lifted a quarter of their own height. Managing all of that seems like a titanic task. I can certainly understand why water is so much easier to manage.