The National Grid Corp. of the Philippines (NGCP) issued a yellow alert status for the Visayas grid for the second consecutive day Thursday, as multiple power plants remained on outage or were running at reduced capacity.
The yellow alert was in effect from 5 p.m. to 7 p.m. Thursday. Available capacity stood at 2,500 megawatts (MW) against a peak demand of 2,301 MW. A yellow alert signals that the operating margin is insufficient to meet the transmission grid’s contingency requirement.
NGCP said the unavailability of a 169-MW unit at Therma Visayas Inc.’s power plant contributed to raising the alert.
Overall, 18 power plants were running on derated capacities, making a total of 660.5 MW unavailable to the grid.
Nine plants have been on forced outage since April or later, four since 2024 and two other power plants have been out since 2023.
The Luzon and Mindanao grids, however, remained under normal condition.
NGCP also raised a yellow alert for the Visayas grid for several hours on Wednesday due to insufficient operating supply margin.
