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This paper presents the operational and power quality monitoring results of three years operating experience of a superconducting magnetic energy storage (SMES) device used to mitigate power quality disturbances at Brookhaven National Laboratory in New York. Brookhaven's SMES unit provides sag and momentary interruption ride-through for the Department of Energy's National Synchrotron Light Source Ring. The unit has successfully performed 380 carry-overs without failure. The recorded power disturbance data corroborates previously published power quality data indicating that the majority of power quality disturbances were less than two seconds in duration.