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The wind does not always blow and the sun does not always shine and this causes fluctuations in the grid. When the output of renewables is lower than the grid demand we burn fossil fuels in peaker plants to supplement the power supply. But, when the output of renewables is higher than the grid demand, we waste the energy which in Ontario, Canada, alone equated to over $1 billion lost by hydro/utility companies. With sufficient battery storage systems, you can store the excess energy and release it when the grid needs supplementation; effectively replacing peaker plants.