TNB System Robustness Expedite Restoration Time
TNB wish to inform that electricity supply to certain areas in the northern, central and southern states suffered disruption due to technical faults at Tanjung Bin Power Plant Unit 4 and Manjung Power Plant Unit 2. Loss of these units which happened at 11.08 am almost the same time, resulted in a drop in system frequency that activated the grid security defense scheme designed to automatically shed load at predetermined frequency and quantum to ensure the security and stability of the grid system.
The area affected by the load shedding operation covers some areas in Perak, Selangor, Wilayah Persekutuan, Kedah, Perlis and Johor involving 1,076 MW supply to all categories of customers across the country.
Restoration process was initiated immediately with the first customer restored at 11.15 am and gradually 95% customers supply restored by 11.40 am, the remaining load was finally restored within an hour.
There was ample generating capacity in the system with today's reserve margin at 4,112MW prior to the tripping.
System generating capacity remains at a healthy level to meet customer’s demand.
TNB regrets any inconvenience caused by the load shedding incident.
For more detail: File