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Originally Posted by Xist
How expensive and efficient is that?
I imagine those two have a strong correlation.
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It depends. The demonstrator is a re-purposed freight line in Nevada with IIRC a 6% grade. Any location with a big elevation change, like Oregon City, OR, could install a narrow-gauge rack railroad or possibly a cable car system.
One complication is the hot rail. Supposedly better than pumped hydraulic storage.
The nice thing about molten salts is passing the phase change temperature each way.