While pumped hydro accounts for the majority of already-installed energy storage capacity, worldwide, lithium-ion (Li-ion) accounts for the vast majority of advanced energy storage facilities we see being deployed today. However, there's a race to develop new technologies - and adapt existing ones - that can either be complementary to lithium batteries, or even compete with them. These could include longer duration electrochemical storage such as flow batteries, mechanical energy storage, thermal energy storage and others including ultracapacitors and hydrogen (power-to-gas) storage.

In this session from the Energy Storage Digital Series online conference hosted earlier this year by our publisher Solar Media, representatives from three technology providers offer up some case studies, data, insights and opinions on where they think the market could go.