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A comment on Why Is Hydroelectricity So Green, and yet Unfashionable?. Parent comment

Re:Why Is Hydroelectricity So Green, and yet Unfashionable? by philipkglass on Thursday October 27, 2022 @09:06PM (#33366226)
The facility you linked produces and stores chemical fuel, and can't even convert it back into electricity.

No, the project includes using Mitsubishi M501JAC combined-cycle gas turbines to turn the hydrogen back into electricity:

https://www.powermag.com/aces-deltas-giant-utah-salt-cavern-...

https://power.mhi.com/products/gasturbines/lineup/m501j

This turbine has a rated combined-cycle efficiency of 64%.

Production of hydrogen is more than 70% efficient in the best current commercial electrolyzers:

https://www.nrel.gov/docs/fy04osti/36705.pdf

Round-trip efficiency is much lower than 80%, but not as low as you have written here.

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Re:Why Is Hydroelectricity So Green, and yet Unfashionable? by pencilguin on Friday October 28, 2022 @12:15AM (#33367619)
Industrial-scale electrolysers will soon be well over 90% efficient.
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Re:Why Is Hydroelectricity So Green, and yet Unfashionable? by nomel on Friday October 28, 2022 @03:55AM (#33368771)
Any terms I can search to understand these advances? I seemed to remember learning that boring old electrolysis was around 30% efficient!
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Re:Why Is Hydroelectricity So Green, and yet Unfashionable? by pencilguin on Friday October 28, 2022 @04:32AM (#33368985)
https://www.nature.com/articles/s41467-022-32652-y
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Re:Why Is Hydroelectricity So Green, and yet Unfashionable? by ClumsyPilot on Friday October 28, 2022 @04:20AM (#33368918)
why are turbines used in place of potentially more efficient fule cells?
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Re:Why Is Hydroelectricity So Green, and yet Unfashionable? by AstralStorm on Friday October 28, 2022 @05:51AM (#33369484)
Cost. Fuel cells require quality manufactured membranes that also require regular maintenance and replacement. Getting volume with them is also a hard problem.
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