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The static state of an electric power system is defined as the vector of the voltage magnitudes and angles at all network buses. The static-state estimator is a data processing algorithm far converting redundant meter readings and other available information into an estimate of the static-state vector. Discussions center on the general nature of the problem, mathematical modeling, an interative technique for calculating the state estimate, and concepts underlying the detection and identification of modeling errors. Problems of interconnected systems are considered. Results of some initial computer simulation tests are discussed.