Storage options are essential for the decarbonisation of electricity systems. Replacing fossil fuels with wind and solar energy—the generation of which is intermittent and variable—needs storage. The storage requirement is around the corner for us especially since solar power, generated only during the day, is going to be the main driver in the achievement of the extremely ambitious 2030 goal, announced at COP26, of creating 500 GW of non-fossil fuel power capacity.