Abstract: A method for Voltage Stability Analysis of a bulk power supply system is taught. Briefly stated, a computationally efficient method is disclosed which is appropriate for low and high voltage applications as well as differing types of loads and load changes, i.e. reactive or otherwise, and which is usable with a multitude of different bulk power supply system systems. More particularly, a nose point of a curve for which MVAr, MW or MVA distances to voltage are calculated, using a generalized curve fit in order to compute an equivalent or surrogate nose point. This is done by approximating a stable branch and creating a voltage versus power curve, determining a plurality of stable equilibrium points on the curve, using the plurality of determined stable equilibrium points to create and fit an approximate stable branch, calculating an approximate voltage collapse point and thereafter a voltage collapse index.