NGCP Article

Underbuilt line causes June 18 outage, NGCP calls on DU for line removal

Published on June 20, 2022 12:00 AM

Following the grid disturbance on 18 June 2022, NGCP assures the public that necessary measures were put in place beforehand to prevent such instances from compromising the security of the entire grid.

NGCP identified the cause of the outage as “underbuilt” lines owned by the Peninsula Electric Cooperative, Inc. (PENELCO). These underbuilt distribution lines are constructed underneath NGCP’s transmission lines and are within the grid operator’s right-of-way. The underbuilt lines breached the safety clearance along NGCP’s Hermosa-BCCPP 230kV line, causing the transmission outage. NGCP already wrote to distribution utilities requesting the removal of underbuilt lines.

When the system recorded the disturbance at 1:53PM on 18 June, NGCP’s protection system was automatically activated to isolate the affected Hermosa-BCCPP 230kV lines 1 and 2. The said lines were restored at 2:35PM and 2:44PM, respectively.

NGCP placed the Luzon grid on yellow and red alert during the incident, as it caused multiple plant outages. The red alert status was lifted at 5:30PM, while the yellow alert status lasted until 10:19PM to allow affected generating plants to ramp back up. As of writing, 596MW from the 1,997MW actual loading of plants which tripped remain unavailable, but the company expects 316MW to return to the grid within the day, depending on the status of the generating plant.

The company will continue to monitor the grid situation for any possibility of red or yellow alert status. “NGCP measures are in place to respond to these incidents to avoid prolonged inconvenience to the public. We are also doing the necessary coordination with PENELCO to remove the underbuilt lines within the transmission corridor. We appeal to other electric cooperatives to check their facilities and take the needed action to prevent similar incidents,” the company said.

NGCP is a Filipino-led, privately owned company in charge of operating, maintaining, and developing the country’s power grid, led by majority shareholders and Vice Chairman of the Board Henry Sy, Jr. and Co-Vice Chairman Robert Coyiuto, Jr. It is the sole operating asset of Synergy Grid and Development Philippines, Inc. ##