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When only one generator is supplying power, the electrical system uses a priority-based shedding logic: keep the most critical loads powered as long as possible and shed nonessential ones first. In this aircraft, AC Bus 1 and AC Bus 4 are treated as the last to shed because they carry the primary loads the system relies on during single-generator operation. The other buses—AC Bus 2, AC Bus 3, AC Bus 1A, and AC ESS—are configured to be shed earlier or have alternative feeds, so they lose power before AC Bus 1 and AC Bus 4. This setup helps preserve the essential cockpit and flight-critical systems as long as the generator can support them.