A method of controlling two or more sources of electrical power to supply electrical power to a shared bus for provision to an electrical load; wherein each source of electrical power has a rated power P r, a maximum overload power P m, and is operable along a multi-voltage droop slope, the multi-voltage droop slope including a share region and a catch region, the share region being defined by an upper voltage limit, V high and a base voltage V base, and the catch region being defined by the base voltage V base and a lower voltage limit, V low; and the method includes: providing a scaling factor, K, for each of the sources of electrical power, the scaling factor operating on a process variable used to control an output of the respective source of electrical power in a control loop, such that the sources of electrical power operate on one of the share region and the catch region; and when a power demand of the electrical load is less than the sum of the rated powers P r, setting one or more scaling factor K such that each source of electrical power is operating in the share region of the multi-voltage droop slope in which a power split between the sources of electrical power is equal to the ratio of P r for a given source of power to the sum of rated powers P r for the sources of electrical power; and when the power demand of the electrical load is greater than the sum of the rated powers P r, setting one or more scaling factor K such that each source is operating in the catch region of the multi-voltage droop slope in which a power split between the sources of electrical power is equal to a ratio of P m for a given source of power to the sum of overload powers P m for the sources of electrical power. wherein each source of electrical power has a rated power P r, a maximum overload power P m, and is operable along a multi-voltage droop slope, the multi-voltage droop slope including a share region and a catch region, the share region being defined by an upper voltage limit, V high and a base voltage V base, and the catch region being defined by the base voltage V base and a lower voltage limit, V low; and the method includes: providing a scaling factor, K, for each of the sources of electrical power, the scaling factor operating on a process variable used to control an output of the respective source of electrical power in a control loop, such that the sources of electrical power operate on one of the share region and the catch region; and when a power demand of the electrical load is less than the sum of the rated powers P r, setting one or more scaling factor K such that each source of electrical power is operating in the share region of the multi-voltage droop slope in which a power split between the sources of electrical power is equal to the ratio of P r for a given source of power to the sum of rated powers P r for the sources of electrical power; and when the power demand of the electrical load is greater than the sum of the rated powers P r, setting one or more scaling factor K such that each source is operating in the catch region of the multi-voltage droop slope in which a power split between the sources of electrical power is equal to a ratio of P m for a given source of power to the sum of overload powers P m for the sources of electrical power. providing a scaling factor, K, for each of the sources of electrical power, the scaling factor operating on a process variable used to control an output of the respective source of electrical power in a control loop, such that the sources of electrical power operate on one of the share region and the catch region; and when a power demand of the electrical load is less than the sum of the rated powers P r, setting one or more scaling factor K such that each source of electrical power is operating in the share region of the multi-voltage droop slope in which a power split between the sources of electrical power is equal to the ratio of P r for a given source of power to the sum of rated powers P r for the sources of electrical power; and when the power demand of the electrical load is greater than the sum of the rated powers P r, setting one or more scaling factor K such that each source is operating in the catch region of the multi-voltage droop slope in which a power split between the sources of electrical power is equal to a ratio of P m for a given source of power to the sum of overload powers P m for the sources of electrical power.