Yes, but it can all come undone if sodium-ion batteries prove to be a cheaper and better alternative to lithium batteries.
http://aquionenergy.com/homeowners/aspen-home-battery-storage/
http://evobsession.com/sodium-ion-battery-breakthrough-50-there/
http://www.electric-vehiclenews.com/2012/11/toyota-developing-next-gen-sodium-ion.html
http://www.autoblog.com/2012/11/21/sodium-ion-batteries-for-toyota-evs-would-offer-enhanced-range/
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