A power transmission system includes a plurality of electrical substations and a plurality of transmission lines arranged to connect the plurality of electrical substations to form a power transmission network; and a controller system arranged to control a power transmission within the power transmission network. The controller system includes: a detection module arranged to detect an occurrence of a fault in at least one faulty electrical substation of the plurality of electrical substations; and a restoration module arranged to at least temporally maintain an output power of the at least one faulty electrical substation; and wherein at least one of the plurality of electrical substations is operable to facilitate maintaining of the output of the at least one faulty electrical substation upon the detection of the occurrence of the fault.