This is a fantastically researched and detailed analysis of the global energy storage market, for grid scale, and well worth a read. 

One thing which perhaps doesn't get much attention as the industry grows and evolves, is skills and job growth. We've all seen the predictions of the size of the market by 2020- 2025. In order to achieve this not only will we need to see the cost reductions and standardisations mentioned in this article, we'll also need to find and develop a significant amount of talent. Finding it can be challenging, but it's what we do, day in and day out, but as demand grows, salaries increase, and demand will outstrip supply. The industry also needs to consider how to grow it's own new talent.