Office of Utilities Regulation's Enquiry Report into JPS Shutdown of July 3, 2007 - December 2007

At approximately 5:11 a.m. on Tuesday, July 3, 2007, electricity customers Island-wide experienced a power outage caused from a complete shutdown of the Jamaica Public Service Company Limited (JPS) electricity grid. This resulted in customers being out of power for periods varying between one to eleven and a half hours. Investigations conducted by JPS immediately following the incident indicated the site of the initiating fault to be in the proximity
of the generator step-up transformer for Unit No. 2 steam generator at Old Harbour power station. Damage was seen on two 138 KV lightning arresters located on the high voltage side of Unit No. 2 generator step-up transformer and burning noted on a dislodged phase conduct or associated with the line-side of an isolating disconnect switch.

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