USB power management and load distribution system

A power management system includes a power management and load distribution (PMLD) circuit 104 within an airplane coupled to an AC power source 102, an AC/DC converter or rectifier, and a programmable output capability outlet (PPCO) circuit 114 operable to receive the DC power. The PMLD circuit 104 stores a predetermined maximum power limit, continuously measures a power output, and increases or decreases a power capability setting based on a comparison of the measured power output to the predetermined maximum power limit. The PPCO circuit 114 includes a USB connector couplable to a personal electronic device (PED) 106 of a passenger for charging the PED 106 at an amount of DC power indicated by the power capability setting. The PPCO circuit 114 is also operable to negotiate a power contract with the PED 106. The system may control different zones of the passenger cabin of the aeroplane, with separate predetermined maximum power limits and power capability settings.