The data shows the operational energy storage power capacity worldwide as of mid-2017, broken down by technology type. The biggest source of electricity storage was pumped hydro storage with 128.1 gigawatts of operational capacity.
Pumped hydro storage | 128.1 |
Thermal storage | 2.3 |
Electro-chemical | 1.6 |
Electro-mechanical | 1.1 |