This looks like a potentially very significant development in achieving a more efficient electricity system. Having advanced warning of how PV plants are going to perform will enable National Grid to plan further in advance and make more efficient use of reserve capacity which will lead to lower costs on the electricity system. Energy storage assets could be primed and ready to smooth out the effect of short periods of lower irradiance. The Sheffield Solar team also plan to roll this out at regional levels and even for individual PV systems. This will be very useful at all scales to make sure electricity is being used as efficiently as possible.