Grid scale storage on the way?

http://www.bbc.co.uk/news/science-environment-20420557

Good idea but I think this, similar, idea is closer to fruition. And just requires larger stacks rather than more cells. Would scale easier.

http://www.zdnet.com/blog/emergingtech/giant-futuristic-batteries-to-power-2000-households/2519

good to see some competition in th field, should lead to more advances in the long run.....or do we have a VHS/Betamax situation on our hands