Energy storage is expected to provide a huge opportunity over the next decade, with BloombergNEF forecasting growth of 30% per year until 2030 and a total investment of more than $260 billion in the period, Berenberg analysts say in a research note. The U.S. and big country in Aisa dominate spending, and energy shifting--storing electricity from periods of over-generation for times of excess demand--is the application where most investment is expected, the German bank says. As for technologies, pumped storage hydro dominates today, while lithium-ion batteries account for most capacity additions and expected near-term growth, Berenberg says.