PowerCube is a homotopy-based parallel program package for computing all the solutions of the load flow equations of power systems. This package adapts the most rigorous mathematical techniques for tracing homotopy curves, checks for the possibility of curve-merging, and selects a convenient dynamic time-step to execute its computation. It also uses a minimal number of homotopy curves, based on a deficient system, for the load flow of power systems. The package runs on a 64-node Ncube multicomputer, and can be easily ported to other message-passing multicomputers. It is user friendly and the authors believe that it will be valuable for solving load flow problems. >