The Visayas region’s electrical grid was placed under a "yellow alert" on Monday, September 28, 2026, from 5 p.m. to 7 p.m., as announced by the National Grid Corporation of the Philippines (NGCP). This advisory signaled a critical tightening of energy reserves, marking another instance of the precarious power situation that has afflicted the central Philippines throughout September. The alert underscored the ongoing fragility of the Visayas grid, grappling with simultaneous plant outages and insufficient operating margins.
This latest warning is more than a technical notice; it represents a tangible threat to the daily lives and economic activities of millions across the Visayas. A yellow alert, while not automatically triggering widespread blackouts, indicates that power reserves are critically low, leaving little buffer should another major generation unit fail or demand unexpectedly surge. This precarious balance often necessitates demand-side management measures and can precede a "red alert," which typically leads to rotational power interruptions to prevent a system-wide collapse, a scenario the Visayas grid has repeatedly faced this year.
On Monday, the grid’s available capacity stood at 2,572 megawatts (MW) against a peak demand of 2,374 MW. This narrow margin was deemed insufficient to meet the transmission grid's crucial contingency requirements, which demand a certain level of reserve capacity to ensure stability. The deficiency was primarily driven by the unexpected unavailability of several large coal-fired power plants that ceased operations early that morning.
Among the key culprits for the reduced supply were Panay Energy Development Corporation (PEDC) Unit 3, KEPCO SPC Power Corporation (KSPC) Unit 2, and Therma Visayas Inc. (TVI) Unit 1. These sudden shutdowns, combined with numerous other plants either on forced outage or operating at reduced capacities, collectively removed a substantial 928.3 MW from the grid's potential supply, directly contributing to the declared alert.
The September 28 alert is not an isolated incident but rather the latest in a succession of power advisories. The Visayas grid has experienced repeated yellow and red alerts throughout September, a pattern the Department of Energy (DOE) acknowledged has persisted since as far back as May 2026. This highlights a systemic vulnerability stemming from multiple factors, including an aging power infrastructure and a heavy reliance on a few large baseload plants.
The situation is further complicated by the inherent challenges of maintaining a complex interconnected grid across multiple islands and the limited capacity of interconnections to Luzon and Mindanao. These limitations restrict the ability of the Visayas to consistently draw significant power imports from neighboring grids, even when those regions might have a surplus, leaving the central islands more vulnerable to internal generation shortfalls.
Experts and advocates have begun to articulate the long-term implications of these persistent power woes. The Cebu Energy Rights Advocates (CERA), for instance, has urgently called upon local governments in Negros and Bohol to re-evaluate existing bans on coal-fired power plants. Nathaniel Chua, convenor of CERA, emphasized that the increasing power requirements of Negros and Bohol are predominantly being met by generation from Cebu, Panay, and Leyte, which themselves are experiencing rapid economic growth and escalating electricity demand.
"Demand for power is shared by one Visayas grid; therefore, the responsibility for the burden of baseload supply must also be shared," Chua stated, outlining the interconnected nature of the regional power supply. He warned that continued dependence on imported baseload power without sufficient 24-hour local generation risks placing additional strain on transmission infrastructure and escalating the risk of another region-wide power crisis.
The call from CERA resonates with immediate realities on the ground regarding supply and demand disparities. Panay, for example, is projected to reach a peak demand of approximately 600 MW by late 2026, even as its dependable in-island supply hovers around 500 MW. Cebu faces an even larger disparity, with peak demand exceeding 1,000 MW against roughly 700 MW of in-island generation capacity.
While Leyte and Samar currently maintain a generation surplus, largely from geothermal sources, their interconnections to the rest of the Visayas grid face capacity constraints. This limits their ability to fully alleviate the shortages experienced in other parts of the region, creating a bottleneck for potential relief.
In response to these burgeoning concerns, the Department of Energy has taken steps aimed at bolstering the grid's resilience. The DOE has reportedly ordered the NGCP to install over 250 megawatts of battery energy storage systems, a move aimed at providing quick-response reserves to stabilize the grid during fluctuations. Additionally, the department is exploring the feasibility of tapping into liquid fuel facilities, a potentially more expensive but readily deployable option to augment power supply during critical periods. These measures, however, represent stop-gap solutions in the face of a deeper structural challenge that requires long-term planning and investment.
NGCP officials, including Engr. Amado Otarra III, senior supervisor of NGCP Network Operations Visayas System Operations, have confirmed the ongoing volatility of the grid. While acknowledging a recent improvement in power supply due to some large generating units returning to service, Otarra cautioned that this relief is temporary. He warned that rotational brownouts could easily return should another major baseload plant suffer a forced outage, especially if the Visayas cannot adequately draw power from Luzon or Mindanao.
The long-offline PEDC Unit 3, a significant 150-MW plant, is not expected to resume operations until November 9, following a major system upgrade. Similarly, the 103-MW KSPC plant in Naga, Cebu, is anticipated to return to service sooner, though its exact date remains subject to technical readiness. The ongoing unavailability of such crucial plants continues to cast a long shadow over the region's energy security, perpetuating the cycle of alerts.
The recurring power alerts in the Visayas, culminating in the September 28 declaration, serve as a stark reminder of the urgent need for comprehensive and sustainable solutions. The underlying issues extend beyond immediate generator outages, pointing to a systemic vulnerability rooted in an aging infrastructure, a reliance on a few large generating assets, and the complexities of managing an island-based interconnected grid. The limitations of inter-island transmission also prevent the efficient distribution of power surpluses, exacerbating regional deficits.
Addressing these challenges requires a concerted effort involving significant investment in diverse and reliable generation capacities, including a balanced energy mix that accounts for baseload stability and renewable integration. Equally critical is the robust development of transmission infrastructure to enhance the grid's resilience and allow for more flexible power transfer between islands and from other major grids. Without these fundamental changes, the Visayas will continue to operate on a razor's edge, vulnerable to frequent disruptions that impede economic growth and disrupt daily life.
The specter of power shortages and the economic disruptions they entail will continue to loom large over the Visayas, necessitating a proactive and integrated energy policy that transcends immediate fixes to build a truly stable and resilient power supply for the Philippines' central islands.