The first energy storage unit has been installed and is operational but I think your article may be a bit dated, it seems to me the deadline was extended again to the fall. I don't have time right now to find the article but I will try later. There were design changes and issues getting the cabinets that delayed the delivery. If you look in the left hand column in this article you will see the announcement of the first battery being installed. http://www.thamesvalleyvision.co.uk/wp-content/uploads/2015/05/Slide1.jpg I ma be wrong about the dates but I will try to confirm when I get time.