Potential gravitational energy storage via rail cars: http://www.utilitydive.com/news/first-of-its-kind-rail-energy-storage-project-targets-role-in-caiso-ancilla/417817/ …
cc @cmuratori
Replying to @sssmcgrath
@sssmcgrath We _so_ invented that.
8:08 PM - 29 Apr 2016
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