def add_peak_demand(self):
        """Summarizes peak loads of underlying load_areas in kVA.
        
        (peak load sum and peak load of satellites)
        """
        peak_load = peak_load_satellites = 0
        for lv_load_area in self.lv_load_areas():
            peak_load += lv_load_area.peak_load
            if lv_load_area.is_satellite:
                peak_load_satellites += lv_load_area.peak_load
        self.peak_load = peak_load
        self.peak_load_satellites = peak_load_satellites
Summarizes peak loads of underlying load_areas in kVA.
        
        (peak load sum and peak load of satellites)