1. A method of analyzing operation data in a decision support system for a complex network, the method comprising: Characterizing network conditions from operation data using a state estimator; Generating a plurality of contingency scenarios based on the network conditions; Determining risk indices for at least a portion of the contingency scenarios; Visually presenting the plurality of contingency scenarios superimposed over one another with risk indices as graphical representations in the context of a visual representation of the network; and Trending historical risk indices based on their graphical representations to predict future network conditions.