Sri Lanka, Oct. 31 -- A report submitted to the Public Utilities Commission by the National System Operator regarding the sudden power outage on 17 October is unclear, according to electrical trade unions.

They pointed out that the public should be clarified on whether the relevant generators shut down due to low-quality coal.

The report states that around 11:43 in the morning on 17 October, 187 megawatts of power supplied from the first generator unit of the Norochcholai Lakvijaya Power Plant was lost from the power grid within 450 milliseconds.

With that, the frequency of the power system rapidly dropped to 48.75 Hertz, and the report states that the total power grid collapsed within 4.1 seconds of the start of the event.

The Nation...