The world of energy storage finds itself in an interesting point in time due to the variety of options available for storage project developers. From lithium-ion to novel battery technologies, compressed gas to gravity storage, the number of systems and companies out there is slightly ridiculous. Apart from all the different combinations of chemistries that constitute the many, many batteries in development, anything that you can lift or compress has probably been turned into some sort of energy storage system. Little wonder that today’s trends are consistent with that, in the sense that you can come across recent news that a new battery system has begun construction in Arizona while a compressed air energy storage (CAES) project has been agreed…