The incident curves for the US and Europe are very similar to each other, but different from the international curve. This increase appears to be real, and probably reflects two factors increasing load on the grid, and the increased cable miles with higher interconnectedness of the grid. a total downtime of at least 1,000,000 customer hours.affects at least 1000 customers (in this study the number is 30,000 minimum) for.an unplanned event (down for maintenance or rotating blackouts don’t count) that.The definition of a major grid failure is: Table I – A Summary of Major Grid Failures Years These failures are typically known by date, weather conditions, grid conditions, cause or causes, locations of failures, extent of failures in population, and duration of the power outage. The items in the following tables show only the major power outages in the US & Canada, Europe, and the rest of the world (International). Because this is a time dependent table, one can determine if the power reliability is improving or declining over the years.īecause the evolution of the power grid is dynamic, one must be careful when drawing conclusions. Table I presents a summary of major power outages over the last 45 years. Maintenance practices, the incidence of extreme weather events, and the loss of transmission lines or power substations may then dominate the causes of power outages in this complex, dynamic system. Until a smart grid is developed, which would separate and isolate sections of the grid, the whole grid could come crashing down.
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