In South Africa, solar and wind are viable and established energy sources, notes digital automation and energy management company Schneider Electric. Unfortunately, it is limited to when the sun is shining, and the wind is blowing, which is why energy storage forms such an important part of the energy generation infrastructure. In exploring the variability of solar in the US state of California, energy producers have observed a trend now referred to as the “Duck Curve”. In essence, the Duck Curve observes a drop in net load (or the demand remaining after subtracting variable renewable generation) in the middle of the day, when solar generation tends to be highest.
