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> What does the Itaipu Dam's installed power have to do with stored energy?

Nothing. Was there something to suggest otherwise? I listed two weak points for hydro: Terrible energy density, massive land use.

My first reference supported the first point and my second reference addressed the second point. Land use: 1,350 square kilometres were flooded. The installed power was to give context of how big the plant is.




Again: the size is incidental to that specific dam. Pumped hydro facilities can be vastly smaller.

Ffestiniog Power Station in the UK is on the order of 1 hectare (1/100 km^2) in area (based on 170,000 m^3 storage and a 34m dam height). It's a modest and early pumped-hydro facility.

https://en.wikipedia.org/wiki/Ffestiniog_Power_Station

Bath County Pumped Storage in the US has an upper reservoir of 107 and a lower of 226 hectares respectively, or 1 km^2 and 2 km^2, roughly. It is the largest in the US.

https://en.wikipedia.org/wiki/Bath_County_Pumped_Storage_Sta...

There is no reason for a purely pumped-hydro facility to be anywhere remotely near the size of Itaipu. Which is not in fact a pumped hydroelectric storage facility, but a hydroelectric generating station with no pumped-hydro storage capabilities or functions.

https://en.wikipedia.org/wiki/Itaipu_Dam

A red herring.


You are reading words that aren't there. The top level comment this thread started with is:

>You couldn't be more Dam wrong.

I am talking about dams, not pumped storage.


And that comment responded to "Energy storage isn't really feasible".

And was followed up, by the same author, with another post specifically about pumped storage: https://news.ycombinator.com/item?id=21479576

That we're still discussing this over 24 hours later may strike someone as amusing, but the jokes gone rather stale.

Cheers.




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