Power distribution system for an aircraft

A power distribution system which may be provided in an aircraft for example is described. The power distribution system has a power distribution bus 110 and a plurality of localised voltage converters 120, each supplied by the power distribution bus 110. By providing a plurality of localised voltage converters 120, the power distribution system may use fewer, or just a single power distribution bus 110 at a particular voltage and convert to the desired voltage at or near to each of a plurality of pieces of electrical equipment being supplied.