A surgical system, comprising: (a) a first instrument (1220, 1320) having a first end effector (1224, 1324), wherein the first end effector is operable to apply a first type of energy to tissue of a patient; (b) a second instrument (1221, 1321) having a second end effector, wherein the second end effector (1227, 1327) is operable to apply a second type of energy to tissue of a patient; (c) one or more electric power generators (1210, 1310) configured to generate first and second energy signals, wherein the one or more electric power generators (1210, 1310) include: (i) a first generator output configured to transmit the first energy signal to the first end effector (1224, 1324), wherein the first energy signal is operable to power the first end effector (1224, 1324) to apply the first type of energy to tissue of a patient, and (ii) a second generator output configured to transmit the second energy signal to the second end effector (1227, 1327), wherein the second energy signal is operable to power the second end effector (1227, 1327) to apply the second type of energy to tissue of a patient; and (d) a power monitor (1260, 1360) operatively coupled with the one or more electric power generators, wherein the power monitor (1260, 1360) is configured to monitor a first energy parameter of the first energy signal and transmit the first energy parameter to the one or more electric power generators (1210, 1310), characterised in that the one or more electric power generators (1210, 1310) are configured to adjust a second energy parameter of the second energy signal, based at least in part on the transmitted first energy parameter, such that interactions between the first energy signal and the second energy signal are avoided. (a) a first instrument (1220, 1320) having a first end effector (1224, 1324), wherein the first end effector is operable to apply a first type of energy to tissue of a patient; (b) a second instrument (1221, 1321) having a second end effector, wherein the second end effector (1227, 1327) is operable to apply a second type of energy to tissue of a patient; (c) one or more electric power generators (1210, 1310) configured to generate first and second energy signals, wherein the one or more electric power generators (1210, 1310) include: (i) a first generator output configured to transmit the first energy signal to the first end effector (1224, 1324), wherein the first energy signal is operable to power the first end effector (1224, 1324) to apply the first type of energy to tissue of a patient, and (ii) a second generator output configured to transmit the second energy signal to the second end effector (1227, 1327), wherein the second energy signal is operable to power the second end effector (1227, 1327) to apply the second type of energy to tissue of a patient; and (i) a first generator output configured to transmit the first energy signal to the first end effector (1224, 1324), wherein the first energy signal is operable to power the first end effector (1224, 1324) to apply the first type of energy to tissue of a patient, and (ii) a second generator output configured to transmit the second energy signal to the second end effector (1227, 1327), wherein the second energy signal is operable to power the second end effector (1227, 1327) to apply the second type of energy to tissue of a patient; and (d) a power monitor (1260, 1360) operatively coupled with the one or more electric power generators, wherein the power monitor (1260, 1360) is configured to monitor a first energy parameter of the first energy signal and transmit the first energy parameter to the one or more electric power generators (1210, 1310), characterised in that the one or more electric power generators (1210, 1310) are configured to adjust a second energy parameter of the second energy signal, based at least in part on the transmitted first energy parameter, such that interactions between the first energy signal and the second energy signal are avoided.