In a simple 275 kV overhead transmission network, there is only one generator operated at 13.8 kV and connected to the 275 kV network through a 13.8/275 kV generator step up transformer with off-load tap changer. The 275 kV network has only minimum load and as a result, the voltage at two 275 kV substations exceed the limit of 1.05 and the generator is operated at its leading power factor limit of 0.95. Without interrupting the supply to the network, the voltage in the 275 kV network can be reduced by: (a) Tum on reactor at the 275 kV substation (b) Adjust the tap changer of the generator step-up transformer (c) Turn on capacitor at the 275 kV substation (d) Adjust the excitation of the generator 3