The Visayas grid is back on yellow alert — and it's a warning that brownouts could hit at any moment.
On Wednesday, the National Grid Corp. of the Philippines (NGCP) announced the alert from 3 p.m. to 9 p.m. because three power facilities aren't available. Under a yellow alert, supply still meets demand, but the system has no room for error. If one more plant trips or goes down, the grid loses balance — and that means rotating blackouts.
This isn't the first time this year. The Visayas grid has been under yellow alert multiple times in recent months, and the NGCP has warned that power supply in the region may stay unstable until August.
The three facilities taken offline weren't named in the advisory. But the NGCP said their unavailability reduced the grid's operating margin to dangerous levels.
A yellow alert is the second-lowest warning in the grid's three-tier system. The lowest is white (normal), then yellow, then red — which means actual brownouts are happening or imminent. The Visayas grid has hit red alert before, most recently in April when several plants shut down due to maintenance and fuel issues.
The NGCP operates the country's transmission network. When it issues a yellow alert, it tells power distributors and the public: we're watching this closely. Any sudden drop in generation could force the grid to shed load — industry speak for cutting power to some areas to prevent a total collapse.
For businesses and households in the Visayas, yellow alerts mean uncertainty. Factories that rely on steady power may have to adjust shifts. Hospitals and critical facilities are supposed to be exempt from load shedding, but in practice, even they can get caught when the grid is stretched thin.
The NGCP has pointed to several reasons for the recurring tightness in Visayas supply: scheduled maintenance of power plants, unexpected breakdowns, and the slow entry of new generating capacity. The region depends heavily on coal and geothermal plants, and when several go offline at once, there isn't enough spare capacity to cover the gap.
The Energy Regulatory Commission has been pushing for more transparency from power plant operators, requiring them to report outages promptly. But critics say the bigger problem is that the Philippines hasn't built enough new power plants to keep up with growing demand.
For now, the Visayas yellow alert is a reminder that the region's power supply remains fragile. The NGCP says it'll continue to monitor the situation and update the public if conditions worsen.
In a yellow alert, the power supply can still meet demand, but it serves as a warning: when a plant breaks down, it'll result in brownouts.
The next few hours — and weeks — will tell whether the grid can hold. For residents of Cebu, Iloilo, Bacolod, and other Visayas cities, the advice is the same: charge your devices, keep flashlights handy, and hope the lights stay on.