A good article here from Stephen Prince at Younicos, the guys with the best strap line in the business (let the fossils rest in peace). It has long puzzled me why the utility and residential storage markets are more active than C&I. The C&I market seemed to be to have the biggest opportunities to benefit from energy storage and its multitude of uses. I guess we're really just entering the point where cost will fall low enough, and demand charges start to hurt enough to drive the market.  And what's not to love in the phrase 'Utility terror dome'! Well worth following the links.