An electricity generation system comprising: a first electric generator designed to generate electricity by rotation of a high-pressure shaft of a compressor constituting a jet engine, a second electric generator designed to generate electricity by rotation of a low-pressure shaft of the compressor, a power distributor for distributing power generated by the first and second electric generators among multiple loads, a first power regulation device for regulating power output of the first electric generator, a second power regulation device for regulating power output of the second electric generator, and a power control device which manipulates the first and second power regulation devices such that a ratio between the power outputs of the first and second electric generators is regulated depending on a total power consumption of the loads, to ensure a specified amount or greater of surge margin of the jet engine, wherein the power control device includes means for setting a normal amount and a lower limit of the surge margin in advance and determining whether or not the surge margin is smaller than or equal to the lower limit, means for increasing the power output of the second electric generator and decreasing the power output of the first electric generator correspondingly if the surge margin is smaller than or equal to the lower limit, means for determining whether the surge margin is greater than the normal amount or not if the surge margin is greater than the lower limit, and means for increasing the power output of the first electric generator and decreasing the power output of the second electric generator correspondingly if the surge margin is greater than the normal amount. a first electric generator designed to generate electricity by rotation of a high-pressure shaft of a compressor constituting a jet engine, a second electric generator designed to generate electricity by rotation of a low-pressure shaft of the compressor, a power distributor for distributing power generated by the first and second electric generators among multiple loads, a first power regulation device for regulating power output of the first electric generator, a second power regulation device for regulating power output of the second electric generator, and a power control device which manipulates the first and second power regulation devices such that a ratio between the power outputs of the first and second electric generators is regulated depending on a total power consumption of the loads, to ensure a specified amount or greater of surge margin of the jet engine, wherein the power control device includes means for setting a normal amount and a lower limit of the surge margin in advance and determining whether or not the surge margin is smaller than or equal to the lower limit, means for increasing the power output of the second electric generator and decreasing the power output of the first electric generator correspondingly if the surge margin is smaller than or equal to the lower limit, means for determining whether the surge margin is greater than the normal amount or not if the surge margin is greater than the lower limit, and means for increasing the power output of the first electric generator and decreasing the power output of the second electric generator correspondingly if the surge margin is greater than the normal amount.