The National Grid Corporation of the Philippines (NGCP) is placing the Visayas grid under recurring red and yellow alert statuses on multiple dates, warning of possible rotating brownouts and outages. Red alerts are generally scheduled during evening peak hours for several hours, while yellow alerts cover shorter periods before and after peak demand.

Across advisories, the primary cause is insufficient power supply linked to the unavailability or outages of major coal-fired power plants. NGCP also cites limited electricity imports from the Mindanao grid, which is itself under tight conditions at times due to high demand. Some reports note extensions or adjustments to alert timings as forecast demand changes.

Outlets consistently explain that a red alert indicates power supply cannot meet consumer demand and the transmission grid’s regulating requirement, while a yellow alert indicates thinning reserves relative to contingency requirements. The specific alert windows and the frequency of red alerts vary by date, reflecting changing plant availability and demand forecasts, including notices into late August and September.