<div>Corrective transmission system operation can help integrate more
renewable energy sources and save redispatch costs by providing a higher
utilization of the power grid.</div>


<div>However, reliable and fast provision of flexibility are key to achieve
corrective operation.
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<div>This work develops a new method to determine if flexibility from
distribution grids is available on transmission corridors when needed.
An analysis of the German energy system in the year 2030 is performed to
estimate the potential of different flexibility options and shows the
potential flexibility distribution systems can contribute to a
corrective transmission system operation.
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