The objective of this paper is to determine what effect the removal of a step-up transformer and direct connection to high voltage will have on both stability and load range of a power system. The Powerformer (TM), a new breed of generator that can be operated at high voltage without a step-up transformer, will be briefly highlighted. Static analyses of 10 and 32 bus Cigre test systems will be presented. A number of different voltage stability indices will be reviewed and a suitable voltage stability margin that best illustrates the effects of this new system arrangement will be discussed
