The vertical grid load shows the power flows in the extra high-voltage grid (>220 kV). These are calculated as the sum of all power transfers from the extra high-voltage level of the transmission grid to the distribution grids with lower voltage levels (high, medium and low voltage) as well as to larger, directly connected final consumers. It is therefore the actual amount of electricity to be supplied directly to the transmission grid (by large power plants) at a given point in time. In contrast to the grid area load, the feed-in from the medium and low voltage level with negative values, e.g. from wind turbines or photovoltaic installations, is included in the total vertical grid load and reduces its capacity value. In other words: the more electricity is fed into the transmission grid from the medium and low voltage grids, the less electricity has to be made available by the transmission grid ‘itself’.
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