At around 10:50 a.m. on Monday, June 16, 2008, a fault occurred on one of our main overhead 24,000-volt transmission lines between the Garrison Generating Station and Belmont Substation, resulting in an island wide power outage.
This occurred when a palm tree branch fell across the lines near Browne's Beach on Bay St, causing a short circuit Under normal circumstances an electrical fault of this nature is successfully cleared by automatic devices designed to protect against damage to the lines and minimize the disruption of service to customers.
However, on this occasion, the protective device at Belmont Substation failed to operate and the fault continued to affect the electrical system causing the main generators at Spring Garden to shutdown and triggering the island-wide outage. Our System Operators immediately isolated the faulty line and initiated emergency procedures.
As soon as it was safe to do so, they began the process of restarting the generating units and restoring supply. Restoration of supply to customers started at around 12:00 noon and by about 1:30 p.m. electricity service to approximately 90% of our customers had been restored. Supply to the remaining customers was restored by about 3:30 p.m. as additional generators were brought on line.
We apologize for the inconvenience caused to customers as a result of this outage and assure them that we will continue our efforts to deliver a safe and reliable electricity supply.