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http://reneweconomy.com.au/2014/evs-double-energy-storage-capacity-zero-cost-86401

EVs could double grid storage capacity – at zero cost

By Giles Parkinson on 25 August 2014

The anticipated proliferation of electric vehicles will effectively double the amount of storage on electricity grids – at effectively zero incremental cost.
That’s the proposition put forward by the global energy team at investment bank UBS, who predict that electric vehicles will reach “true cost parity” before 2020.
This, combined with rooftop solar at grid parity and the falling costs of batteries, will fundamentally change the nature of electricity networks.