Parallels are frequently drawn between the nascent energy storage business and solar 10 years ago – that it needs strong policy direction to take off. Andy Colthorpe profiles some of the areas emerging as world pioneers in supporting the deployment of storage.

Energy storage might not be cost effective in Germany as a method of helping the transition to a higher grid penetration of renewable energy, until that penetration level reaches as high as 90%, according to a leading think tank.