Power has been restored to more than 11,000 properties in the western parishes that were hit by an outage late Saturday night.

The blackout, caused by a fault in Belco’s underground transmission network, occurred at about 10.50pm.

The Belco website showed that all of Warwick, Southampton and Sandys parishes had lost electricity.

Outages were also reported in parts of Paget, Pembroke and Hamilton Parish, although it is not known if those power cuts were caused by the same transmission fault.

According to a Belco spokesman, the fault was repaired and power was restored by 2am.

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The spokesman said yesterday: “Last night at approximately 10.49pm, Belco experienced a fault on its underground transmission network, resulting in a loss of supply to the western end of the island, affecting approximately 11,400 customers.

“Response personnel were quickly mobilised, and following a review of events, the faulted section was isolated and restoration work commenced within the hour, with approximately 10,500 customers restored by 1am and all customers restored by 1.50am.

“Testing to determine the exact location of the fault in the underground transmission system is in progress to be followed by excavation works and repairs.”

The outage is the second major blackout to hit the island in six months.

In February, the entire island went without power for several hours after a fault within a voltage transformer at the plant.

In a post-mortem examination of that incident, the Regulatory Authority warned that Belco — the island’s only electricity supplier — would likely have to introduce “robust changes” to become more reliable.

• UPDATE: this article has been amended to include fresh information