An electrical power system comprising: a first ac bus and a first generator set (11, G1) configured to supply the first ac bus with ac electrical power; a second ac bus and a second generator set (12, G2) configured to supply the second ac bus with ac electrical power; an interconnecting transformer connected between the first and second ac busses; a primary electrical load (M1, M2) connected to both the first and second ac busses via a converter arrangement , such that the primary electrical load can receive electrical power from both the first and second generator sets; and an auxiliary electrical load connected the first ac bus, such that the auxiliary electrical load receives electrical power from the first generator set, characterized in that the electrical power system further comprises a controller configured to control the first generator set according to a first droop control profile and to control the second generator set according to a second droop control profile, the first and second droop control profiles relating respective output frequencies of the first and second generator sets to respective output powers of the first and second generator sets, wherein: the controller is configured to control the first and second generator sets such that their output frequencies are equal; and the first and second droop control profiles differ such that, when the first and second generator sets operate at equal output frequencies, an electrical power demand of the primary electrical load is shared equally between the first and second generator sets whilst an electrical power demand of the auxiliary load is met by the first generator set. a first ac bus and a first generator set (11, G1) configured to supply the first ac bus with ac electrical power; a second ac bus and a second generator set (12, G2) configured to supply the second ac bus with ac electrical power; an interconnecting transformer connected between the first and second ac busses; a primary electrical load (M1, M2) connected to both the first and second ac busses via a converter arrangement , such that the primary electrical load can receive electrical power from both the first and second generator sets; and an auxiliary electrical load connected the first ac bus, such that the auxiliary electrical load receives electrical power from the first generator set, characterized in that the electrical power system further comprises a controller configured to control the first generator set according to a first droop control profile and to control the second generator set according to a second droop control profile, the first and second droop control profiles relating respective output frequencies of the first and second generator sets to respective output powers of the first and second generator sets, wherein: the controller is configured to control the first and second generator sets such that their output frequencies are equal; and the first and second droop control profiles differ such that, when the first and second generator sets operate at equal output frequencies, an electrical power demand of the primary electrical load is shared equally between the first and second generator sets whilst an electrical power demand of the auxiliary load is met by the first generator set. the controller is configured to control the first and second generator sets such that their output frequencies are equal; and the first and second droop control profiles differ such that, when the first and second generator sets operate at equal output frequencies, an electrical power demand of the primary electrical load is shared equally between the first and second generator sets whilst an electrical power demand of the auxiliary load is met by the first generator set. <EOS>