How large a scale does energy storage equipment have to be to be profitable

The 2020 Cost and Performance Assessment analyzed energy storage systems from 2 to 10 hours. The 2022 Cost and Performance Assessment analyzes storage system at additional 24- and 100-hour durations.

GB will need large-scale energy storage to complement high levels of wind and solar power. No low-carbon sources can do so at a comparable cost. Construction of the large-scale hydrogen storage that will be needed should begin now. royalsociety.org/electricity-storage.

Great Britain's demand for electricity could be met largely (or even wholly) by wind and solar energy supported by large-scale storage at a cost that compares favourably with the costs of low-carbon alternatives, which are not well suited to complementing intermittent wind and solar energy and variable demand.

Hence, when shifting energy grids toward a more renewable future, one needs to match demand with an increasingly variable and less controllable supply. To ensure grid stability, we must rely on large-scale energy storage.

Existing Lastly, the cost of energy storage has been decreasing steadily over the past several years, making industry- scale storage economically viable (e.g. lithium-ion cost decreased from $1,183 per kWh in 2010 to $137 per kWh in 2020).

Pumped-hydro energy storage (PHES) plants with capacities ranging from several MW to GW and reasonably high power efficiencies of over 80% [ 4, 5] are well-established long-term energy storage systems. Compressed air energy storage is another widely established large-scale EES alternative (CAES).