Electricity storage will play a crucial role in enabling the next phase of the energy transition. Along with boosting solar and wind power generation, it will allow sharp decarbonisation in key segments of the energy market.
As variable renewables grow to substantial levels, electricity systems will require greater flexibility. At very high shares of VRE, electricity will need to be stored over days, weeks
or months. By providing these essential services, electricity storage can drive serious electricity decarbonisation and help transform the whole energy sector.
Future energy systems will rely on a large array of services based on effective, economical electricity storage. This plethora of service needs, with varying performance
requirements, suggests an important role for many different storage technologies.
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http://www.irena.org/DocumentDownloads/Publications/IRENA_Electricity_Storage_Costs_2017.pdf