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Re:Tesla strikes another mammoth energy storage deal in Cali... by 0x4f3759df on Wednesday July 04, 2018 @12:32PM (#17458109)
One issue is that they need to stay cooled and so there's an entire cooling apparatus which of course takes power.

https://electrek.co/2017/01/24/tesla-teardown-100-kwh-batter...

Re:Tesla strikes another mammoth energy storage deal in Cali... by toomuchtodo on Wednesday July 04, 2018 @12:44PM (#17458167)
Which is minor compared to having to curtail renewables production.
Re:Tesla strikes another mammoth energy storage deal in Cali... by Pica_soO on Wednesday July 04, 2018 @04:06PM (#17459194)
Cooling can be done with ice-rods- which are created when energy is abundant and store surprisingly well in the long term. Even in the pre-Musk eras.

https://en.wikipedia.org/wiki/Yakhch%C4%81l