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View Diary: Solar Energy Cheaper than Coal? (351 comments)

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  •  there's other ways (0+ / 0-)

    flow batteries are more efficient than the electrolysis - fuel cell loop, and like them can increase the storage capacity by adding more storage tanks.  They also might use less rare materials than fuel cells, which still depend on platinum group metals for the best performance.

    On a larger scale pumped storage could help, needing just elevation changes to work.

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