Executive Summary for Red and Yellow Power Grid Alerts in Visayas and Mindanao
The National Grid Corporation of the Philippines (NGCP) has again placed the Visayas grid under a red alert and both the Visayas and Mindanao grids under yellow alerts on Thursday, 10 September 2026, as power plant outages and limited electricity imports from Mindanao thin the region’s reserves. The Visayas grid will be under red alert from 1400 to 2100 hours local time., with yellow alerts also in effect from 1300 to 1400 hours and from 2100 to 2200 hours. NGCP separately declared a yellow alert over the Mindanao grid, covering the periods 1300 to 1600 hours and 1700 to 1900 hours. A red alert indicates that supply cannot meet demand, raising the risk of rotational brownouts unless consumption is managed carefully, while a yellow alert signals thinning reserves that leave the system vulnerable to any further unplanned outage.
- Date of Event: 10 September 2026
- Location: Visayas and Mindanao power grids, Philippines
- Risk Category: Critical Infrastructure
- Severity: 3/5
- Confidence Score: 75%
What is Risk Analysis in the Context of Critical Infrastructure Events
Critical infrastructure event risk analysis evaluates how thinning generation reserves and plant outages affect the balance between electricity supply and demand across an interconnected grid. When available capacity falls close to, or below, peak demand, grid operators raise alert levels to warn consumers, businesses and local authorities that the system has little or no buffer left to absorb further disruption, and that rotational power interruptions may become necessary to protect overall grid stability.
Known Hotspots and Sensitive Areas
High Impact
- Visayas grid consumers during the red alert window, when available capacity is expected to fall short of peak demand
- Power plants currently on outage that are limiting available capacity, along with the reduced electricity imports from Mindanao that the Visayas grid normally relies on
Medium Impact
- Mindanao grid consumers during the yellow alert periods, when reserves are thin but supply is not yet expected to fall short of demand
- Visayas grid consumers during the surrounding yellow alert periods, as the system transitions in and out of the red alert window
Low Impact
- Luzon grid customers, who are not covered by the alerts issued for Visayas and Mindanao
- Areas outside the NGCP-managed Visayas and Mindanao interconnections, where normal operations are expected to continue
Impact on Transportation and Services
Should the red alert convert into an actual supply shortfall, NGCP may need to implement rotational, manually-controlled load dropping across parts of the Visayas grid to keep the system stable, temporarily cutting power to affected barangays. Traffic signals, water pumping stations, telecommunications infrastructure and commercial establishments without backup generation in the affected areas could experience brief interruptions. Hospitals and other critical facilities that depend on the grid should treat the red alert period as a precaution to activate standby power arrangements. Businesses across Visayas and Mindanao that rely on continuous power for operations should likewise prepare for possible short interruptions during the alert windows.
Recommended Actions
- Reduce non-essential electricity use across Visayas across Mindanao to help ease strain on the grid.
- Businesses and households should prepare backup lighting or power arrangements in case rotational interruptions occur during the red alert window.
- Hospitals, water utilities and other critical facilities should activate standby generators as a precaution during the alert periods.
- Motorists should watch for non-functioning traffic signals in affected areas and exercise added caution at intersections.
- Monitor official NGCP advisories and local distribution utility announcements for updates on the alert status and any changes to the schedule.
Emergency Contacts
- NGCP Main Office (Quezon City): +63 2 8981 2100
- Department of Energy – Visayas Field Office: +63 32 253 2150 / +63 32 253 7222
- Department of Energy – Mindanao Field Office: +63 906 184 4428 (Globe) / +63 909 894 3328 (Smart)
Final Thoughts
The renewed red and yellow alerts over the Visayas and Mindanao grids on 10 September 2026 underline how quickly thin reserves and unplanned plant outages can push a grid operator toward the risk of rotational brownouts. With available Visayas capacity trailing peak demand as of the morning of the alert, consumers, businesses and critical service providers across the two island groups are advised to conserve power during the flagged hours and to stay alert to further NGCP updates. Leveraging MitKat’s Datasurfr enables businesses to receive real-time intelligence, monitor evolving threats and make informed decisions to protect people, assets and operations.