Visayas tides eyed as major renewable energy source for Philippines

Ateneo study identifies San Bernardino, San Juanico, and Cebu straits as key sites for tidal energy projects amid 170 GW marine power potential.

Some of the strongest tidal currents in the Visayas could one day become a major source of electricity for the country, potentially reducing dependence on imported fossil fuels and strengthening its energy security, researchers from the Ateneo de Manila University said.

The study identified the San Bernardino Strait (between Sorsogon and Northern Samar), the San Juanico Strait (between Samar and Leyte), and the Cebu Strait (between Cebu and Negros) as among the most viable locations for tidal-stream energy systems, which generate power by converting the movement of ocean currents into electricity.

According to the researchers, independent studies estimate that Philippine coastal waters possess a theoretical marine energy potential of up to 170 gigawatts, compared to the country’s current installed power capacity of about 32 gigawatts. They noted that harnessing even a fraction of this resource could make a significant contribution to the country’s national electricity demand.

Unlike solar and wind energy, which depend on weather conditions, tidal currents follow predictable cycles. This makes tidal power a potentially reliable source of renewable energy, particularly for island and coastal communities that remain dependent on diesel-powered generation.

One example already exists near Capul Island (Northern Samar), where a one-megawatt tidal-stream system is being installed to help replace diesel generators that supply electricity to the island.

The findings come as the country continues to struggle with high electricity costs and exposure to global fuel price fluctuations. For decades, much of the country’s power generation has relied on imported coal, oil, and natural gas, leaving consumers vulnerable to international supply disruptions and geopolitical tensions.

While tidal energy remains more expensive than established renewable technologies, the researchers said continued investment and larger-scale deployment could help lower costs over time. They argue that the country’s vast coastline and powerful marine currents represent an often-overlooked resource that could expand its energy supply.

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