The National Grid Corp. of the Philippines (NGCP) on Thursday declared a yellow alert status for the Visayas grid from 5 p.m. to 6 p.m., citing thin reserves caused by a limited power supply from Mindanao.
The system operator issues a yellow alert when the operating margin is insufficient to meet the transmission grid’s contingency requirement.
NGCP said in its advisory that peak demand during the period reached 2,535 megawatts (MW), compared to an available capacity of 2,578 MW.
Several factors contributed to the alert status. The NGCP cited a 36-MW increase in Visayas demand, the outage of KSPC Unit 2 (103 MW), the derating of Agus 6 at 66.5 MW and the limiting of the export to Visayas to 207 MW by the Mindanao Visayas Interconnection Project (MVIP) due to a 49-MW increase in Mindanao demand.
Overall, a total of 482.41 MW was unavailable to the grid. This was due to 10 plants being on forced outage (with plants out since 2024, 2023, and 2021) and 16 running on derated capacities.
NGCP confirmed that the Luzon and Mindanao grids were operating under normal condition.
