Load 108 draws some amount of apparent power, S, expressed in volt-amperes (VA). The apparent power is a combination of real power, P, expressed in Watts, drawn by the real component of load 108 and reactive power, Q, expressed in var, drawn by the reactive component of load 108. FACTS 100 includes sensors 116, 118, and 120 configured to measure respective voltages and currents of transmission lines 102, 104, and 106. Sensors 116, 118, and 120 include, for example, and without limitation, voltage sensors and current sensors. FACTS 100 further includes a controller 122 communicatively coupled to sensors 116, 118, and 120. Controller 122 receives measured voltages and currents from sensors 116, 118, and 120 and determines values of real power, P, and reactive power, Q, transferred to load 108 through transmission lines 102, 104, and 106.

FACTS 100 includes a reactive impedance 124 configured to be coupled to transmission lines 102, 104, and 106. Reactive impedance 124 includes at least one of an inductive device and a capacitive device. In certain embodiments, for example, and without limitation, reactive impedance 124 includes one or more passive capacitors, one or more passive inductors, or a combination of capacitors and inductors.