The National Grid Corporation of the Philippines (NGCP) today declared a yellow alert for the Visayas grid, effective Monday, May 18, from 4 p.m. to 8 p.m., as widespread power plant outages and derated capacities strain the region's energy supply. This advisory signals a critical tightening of power reserves, leaving the central Philippine islands vulnerable during peak consumption hours.
The declaration marks another episode in a series of precarious power situations confronting the Visayas, highlighting systemic vulnerabilities in its energy infrastructure. For millions of residents and a rapidly developing economy across the islands, a yellow alert signifies an elevated risk of power interruptions, directly impacting daily life, businesses, and the broader economic stability of the region.
A yellow alert indicates that the grid’s operational reserves have fallen below the contingency levels deemed essential for stable, uninterrupted service. While it does not immediately trigger rotating blackouts, it warns of a slender margin between available supply and anticipated demand, making the grid highly susceptible to disruptions should any additional generating units fail or electricity usage exceed projections. This delicate balance becomes particularly tenuous in the late afternoon and early evening, when residential and commercial demand typically surges.
According to advisories released by both the NGCP and the Department of Energy (DOE) today, the Visayas grid is operating with an available capacity of 2,676 megawatts (MW) against a projected peak demand of 2,513 MW. This narrow surplus, however, conceals a deeper fragility: a substantial 852.9 MW of potential generating capacity remains offline. This significant shortfall is primarily due to a troubling number of power plants currently on forced outage or operating at reduced capacities.
Thirteen power plants across the Visayas have been on forced outage since the beginning of May alone, with some units having been offline for significantly longer periods, dating back to 2021, 2023, 2024, and 2025. Compounding this issue, eleven other plants are running below their full operational potential. Among the large coal-fired power plants cited as unavailable are TVI Unit 1, TVI Unit 2, and PEDC Unit 3, whose combined absence substantially diminishes the region's overall generating capability.
This latest yellow alert is not an isolated event but rather a continuation of a troubling pattern that has persisted in the Visayas grid over recent days and weeks. Just two days prior, on Saturday, May 16, the grid was placed under a similar yellow alert from 5 p.m. to 8 p.m., driven by a familiar combination of increased demand and forced outages, specifically impacting TVI Units 1 and 2, and PEDC Unit 3.
That weekend, available capacity stood at 2,658 MW against a peak demand of 2,492 MW, leaving a slender 166 MW reserve. The NGCP managed to lift the alert by 9:50 p.m. on May 16, attributing the improved supply conditions to lower weekend demand. However, the respite proved fleeting, as today’s renewed alert underscores the grid’s persistent precariousness. Earlier data from Saturday had shown available capacity at 2,768 MW against 2,339 MW demand, partly augmented by power exports from the Luzon grid.
The fragility of the Visayas power system extends even further back, with a yellow alert declared on Friday, May 15, from 3 p.m. to 10 p.m. This followed widespread power interruptions that affected millions across the Philippines. During that period, fifteen plants in Visayas were on forced outage since May, with one unit offline since March. Available capacity was approximately 2,379 MW against an expected peak demand of 2,574 MW, creating a clear deficit.
Energy Secretary Sharon Garin, responding to the broader crisis that included massive transmission line trippings affecting Luzon and exacerbating Visayas' precarious conditions, had initiated a full investigation. She called for "full technical disclosure, clear accountability, and immediate corrective action," emphasizing the severity of the situation and the urgent need for robust solutions. The incident starkly illustrated the interconnectedness of the national grids, where disruptions in Luzon directly hindered the ability to transfer crucial electricity to the Visayas.
The underlying problem of persistent plant outages, some stretching back for months or even years, points to deeper structural issues within the country's power generation sector. The NGCP has previously acknowledged that a significant portion of unavailable power, exceeding 4,000 MW system-wide, is attributable to these long-standing forced outages and derated plants. The current heat wave gripping the Philippines further exacerbates the problem, driving up electricity demand for cooling across residential, commercial, and industrial sectors, thus creating a perfect storm for power instability.
The implications of these recurring yellow alerts are far-reaching, extending beyond mere inconvenience. For ordinary citizens, the constant threat of brownouts translates into anxiety, disrupting daily routines, impacting productivity, and potentially posing health risks during periods of extreme heat. Businesses, particularly those heavily reliant on consistent power, face operational challenges, financial losses from spoiled goods or idle machinery, and diminished competitiveness in a global market. The pervasive uncertainty undermines confidence in the grid's reliability, a factor that could deter future investment and impede economic growth in a region striving for robust development. The Department of Energy’s proactive monitoring, while essential for situational awareness, also serves as a stark reminder of the inherent risks that continue to cast a shadow over the Visayas’ energy landscape.
Addressing this chronic power instability necessitates a comprehensive, multifaceted approach. Beyond the immediate imperative of repairing and maintaining existing generating units, there is a critical and urgent need for new, reliable generating capacity to meet the region's steadily increasing demand. This includes strategic investments in diversifying energy sources, modernizing the grid's infrastructure, and enhancing the resilience of the transmission network to withstand both technical failures and external shocks. Furthermore, the establishment of clearer accountability mechanisms and more stringent oversight of power plant operators are crucial to ensure timely repairs, preventative maintenance, and adherence to operational standards, thereby reducing the frequency and duration of forced outages that consistently compromise the grid's stability.
The current situation in the Visayas stands as a potent reminder that while yellow alerts may signify a "manageable" supply margin, the underlying vulnerabilities demand urgent and sustained strategic attention from policymakers and energy stakeholders alike. Failure to implement fundamental structural changes risks escalating these "yellow" warnings into far more severe and widespread power crises in the not-so-distant future, imperiling the very fabric of life and economic progress across the central Philippines.