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Renewable energy is a reliable source of power. Control systems can be used in a manner of ways to charge and discharge cycles of energy storage devices. Storage devices are charged when there is an excess of renewable generation and discharged when there is a deficit.This type of control takes frequent measurements of key electrical variables at specific points in the network to control flexible demand and renewable generation. This stops too much energy being fed into the network at once- if necessary, by restricting generation levels of renewable sources, this avoids exceeding the thermal capacity of power lines, stabilises the network voltages and avoids outages and system faults.