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The state estimator must be highly available and must also be able to provide a reasonable, accurate, and robust solution that meets the purposes for which it is intended. Practitioners report that the average time during which state estimator solutions are unavailable is 15 minutes or less per outage for almost all users. In addition, unavailability of the state estimator for up to 30 minutes is considered as having no significant impact on system operations.

Having state estimator failures less than 30 minutes apart is perceived as having a “significant” impact on system operations. This however varies according to internal policies and market considerations.