Perhaps a slight tangent, but there are few interesting things going on in the commercial energy storage world.
First up,
A Saudi energy company rocks the market with unsubsidised, renewable, base load electricity projects that undercut gas fired generation by 30%...in Abu Dhabi of all places:
http://reneweconomy.com.au/2015/saud...il-fuels-57218
And;
game changing, ultra long life, cost effective battery storage:
http://revolution-green.com/eos-auro...tem-follow-up/