Another exciting development, not that EV second life batteries as storage is new, a number of such projects exist, but because of the players. BMW is a brand with a big pull, and a reputation for quality and build quality. Likewise Bosch is well known in many diverse industries, not just automotive and energy. And of course seeing a big utility like Vattenfall engage is good to see. 

The more projects of this nature get into the public domain the better. The battle for energy storage and clean energy generally is as much a battle for the hearts and minds of consumers and the public as it is a technical one. When people see it works, now, then they can question politicians on why choose older, fossil based solutions. In that regard Tesla, BMW, Mercedes Benz, Nissan etc bring exposure and projects that aid the market as a whole.