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The dry season has long been the Philippines’ most critical period for electricity demand. As temperatures rise from April to June, households and businesses sharply increase cooling usage, pushing the grid toward peak load conditions. Air-conditioning demand alone drives significant spikes in electricity consumption during these months, placing sustained pressure on generation and transmission systems.
This seasonal surge has repeatedly exposed underlying vulnerabilities in the country’s power sector. Grid alerts, which are warnings of thinning reserves, have become a recurring feature of the summer months, sometimes escalating into service interruptions. The key question for 2026 is not simply whether there is enough electricity, but whether the system can endure the strain of peak demand without disruption.
(Also read: How the PH is Battling Sky-High Energy Prices)
A Fragile Outlook
According to the Philippine Power Outlook 2026 by the Institute for Climate and Sustainable Cities (ICSC), the country is expected to maintain an adequate electricity supply through the dry season, but only under relatively stable conditions.
The report characterizes the outlook as “manageable,” but emphasizes that reserve margins stay tight. “During peak weeks, supply margins remain highly sensitive to changes in demand, delays in project completion, unplanned outages of major plants, or disruptions in the high-voltage direct current lines that connect the three main island grids,” the report notes. “Should more baseload power plants go on outages beyond the conservative estimates, grid alerts may be raised.
Concerns over the Philippines’ power supply have persisted for years. Over the past four years, the ICSC has repeatedly warned of likely grid alerts during the April to June period, underscoring a recurring strain on the energy system.
Electricity demand in the Philippines is projected to rise steadily, with peak load expected to grow annually by 5.4% in Luzon, 6.6% in Visayas, and 6.9% in Mindanao, according to the Department of Energy (DOE). This sustained growth leaves the grid increasingly vulnerable to disruptions, where even minor supply interruptions can heighten the risk of system stress. A yellow alert signals critically low reserves, with just enough capacity to meet demand. A red alert, by contrast, reflects a supply shortfall that can trigger rotating blackouts.
Focus on Visayas: The Most Vulnerable Grid
The Visayas grid remains the most exposed to supply constraints during the dry season. An early signal of this vulnerability emerged in January 2026, when a yellow alert was already raised in the region, well ahead of peak demand months.
“Despite occurring during a period of relatively low demand (cool season, before summer peak), the alert demonstrates how the combination of forced outages and planned maintenance can quickly erode reserve margins,” states the report.
Unlike Luzon and Mindanao, the Visayas grid is made up of several major island systems connected by transmission lines of varying capacity. This fragmented setup creates constraints, particularly when inter-island links cannot meet demand.
The Visayas grid is projected to run a deficit throughout Q2 2026, with meeting demand and maintaining reserves heavily reliant on high-voltage direct current (HVDC) imports from Mindanao and Luzon. This growing dependence highlights a deeper structural gap: the region is not generating enough power to keep pace with rising demand. While interconnections with Luzon and Mindanao provide crucial short-term relief, they also expose the grid to external risks beyond its control.
Energy officials have already warned of a looming imbalance. “There’s a potential critical supply situation in the Visayas. That’s based on the initial simulation of demand-supply,” said DOE Undersecretary Mylene Capongcol as early as December 2025.
Nowhere is this challenge more evident than in Cebu, the region’s economic hub. Demand in the province has been rising rapidly, by around 150 megawatts (MW) annually, outpacing the development of new local generation.
“Cebu has been relying more on imported electricity transmitted through submarine cables, a setup that is risky and unsustainable,” warned Cebu Electricity Rights Advocates (CERA) convenor Nathaniel Chua.
In the Visayas, transmission constraints remain a key systemic risk, alongside expanding embedded generation within the islands to improve local resilience and reduce dependence on long inter-island power flows.
The DOE has identified the Visayas as a potential area of concern for power supply stability, citing its reliance on electricity imports from other grids. The DOE also noted that the region’s outlook has been further affected by the termination of several renewable energy (RE) contracts, which may tighten the supply situation and add pressure to system adequacy in the coming years.
Wennie Sancho, president of the Alliance of Concerned Consumers in Electricity and Social Services (ACCESS), also raised concerns about the high probability that the Visayas grid may experience repeated yellow alerts this year. He stressed that failing to address the issue could trigger a power crisis, drive up supply costs, and adversely affect the economy, jobs, and consumers’ daily lives.
“The need for a clear energy roadmap is urgent. This is not just about Cebu—it’s about the entire Visayas region facing a power crisis,” declared Sancho.
(Also read: Cebu Pushes Solar, Braces for Soaring Power Costs)
The Case for Energy Independence
The ICSC recommends shifting away from expanding baseload capacity toward a more flexible, diversified power mix. It calls for investments in fast-ramping plants, battery storage, and pumped hydro to meet peak demand, strengthen reserves, and stabilize the grid. The organization states that these resources also support the integration of variable renewable energy, improving reliability while reducing dependence on fossil fuels and addressing challenges such as late-afternoon demand ramps that trigger grid alerts.
However, this recommendation raises important concerns regarding system reliability. Increasing reliance on variable renewable energy can introduce greater intermittency and forecasting uncertainty, complicating real-time balancing. In systems where flexible capacity and storage remain constrained, this can place additional pressure on reserve margins and dispatch operations during peak demand periods and sudden supply fluctuations, underscoring the continued importance of firm, dispatchable generation in maintaining grid stability.
Beyond operational balancing concerns, firm generation plays a structural role in maintaining grid adequacy. Its ability to provide continuous and predictable output ensures system reliability under sustained high demand conditions and during prolonged supply disruptions.
Chua highlighted the crucial role of baseload, noting that temporary measures alone are insufficient. “Solar is first aid, but Cebu urgently needs the ‘surgery’ of new baseload power plants to ensure long-term reliability and price stability,” he said. “Baseload power is the backbone of a stable energy system.” He cautioned that Cebu’s economic momentum could stall this year if the island fails to develop new, reliable power plants.
ICSC has also promoted rooftop solar systems to boost supply and reduce dependence on imported fuels. However, as energy policy experts Eduardo and Dianne Araral pointed out, the shift to renewable energy is not entirely self-sufficient, as these technologies rely heavily on materials and processes that often occur outside the country.
“Three (vulnerabilities) stand out: the concentration of processing and production of critical minerals, the increasing fragmentation of trade and standards, and the vulnerability of existing power grids,” they wrote. “Taken together, these vulnerabilities make it clear that the energy transition is not simply a climate or industrial project. Above all, it is a coordination challenge, and great power rivalries make it difficult to achieve.”
With advanced economies competing for critical minerals, emerging countries like the Philippines face structural challenges in securing supply chains for the energy transition. An aggressive shift to renewable energy can expose these vulnerabilities, especially as grid upgrades lag and battery storage remains limited.
ICSC has emphasized the need to scale up renewable energy alongside stronger grid flexibility, but without sufficient balancing infrastructure, variable renewables can heighten the risk of outages and system instability.
Moreover, too much renewable energy in the mix has its own risks. The April 2025 Iberian blackout in Spain and Portugal has intensified debate about whether very high shares of variable renewables—mainly solar and wind at the time—can stress grid stability if not matched with sufficient system “firming” such as synchronous generation, storage, and voltage control.
At the moment of the event, renewables supplied a majority of electricity, and the system experienced rapid voltage instability and cascading disconnections that led to a full collapse within seconds. Experts highlighted that limited inertia, insufficient reactive power support, and inadequate grid flexibility contributed to the system’s vulnerability during disturbances.
Balancing Growth, Reliability, and Resilience
The Philippines’ power system is entering the dry season under mounting pressure, and as highlighted in recent assessments and stakeholder concerns, the Visayas faces the most immediate risks. These conditions point to a broader national challenge: ensuring that power supply keeps pace with demand while maintaining stability across increasingly interconnected but unevenly developed island grids.
In this context of tightening supply conditions, the ICSC has criticized baseload plants for unexpected outages, but renewable energy still lacks firm baseload equivalents capable of fully replacing fossil fuel-based generation at scale. Until such technologies are widely available and system-ready, maintaining a diversified energy mix remains essential to ensure grid reliability, energy security, and price stability.
Moving forward, the energy transition must balance ambition with practicality. Scaling renewable energy, improving grid infrastructure, and expanding storage are essential steps toward a more sustainable system. At the same time, ensuring dependable, dispatchable capacity remains critical to support reliability, manage demand fluctuations, and sustain economic growth.
Ultimately, a balanced and forward-looking approach is needed—one that aligns energy security with economic resilience and ensures the system can reliably meet the country’s growing power needs.
Sources:
https://www.gmanetwork.com/news/money/economy/981195/ph-power-outlook-april-june-2026/story
https://icsc.ngo/wp-content/uploads/2026/03/ICSC_Power-Outlook-2026.pdf
https://www.philstar.com/business/2025/12/17/2494743/visayas-power-supply-seen-critical-2026
https://www.philstar.com/the-freeman/cebu-news/2026/01/04/2498680/cebu-facing-power-crisis
https://www.sunstar.com.ph/bacolod/visayas-faces-frequent-power-alerts
https://dailyguardian.com.ph/access-backs-call-for-visayas-energy-roadmap-by-2026
https://en.wikipedia.org/wiki/2025_Iberian_Peninsula_blackout