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Re:Tesla's giant battery saved $40M during its first year, r... by benj111 on Thursday December 06, 2018 @01:37PM (#18620743)
4 * $66m = $264m / $40m = 6.5 ish years payback.

Not many investments offer that rate of return.

You may be right to suggest it may not be competitive in other locations though. I don't know.

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