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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def peak_generation(self):
 """Cumulative peak generation of generators connected to LV grids of underlying LVGDs """

        cum_peak_generation = 0

        for lv_grid_district in self._lv_grid_districts:
            cum_peak_generation += lv_grid_district.lv_grid.station().peak_generation

        return cum_peak_generation