Philippines Solar Surge Warps Daily Power Prices

A dramatic rise in renewable energy, particularly solar power, is reshaping the intraday electricity price patterns across the Philippines, according to Green Tiger Markets CEO John Knorring.

“What was once a relatively predictable intraday pricing pattern—mild in the morning, peaking by mid-afternoon, and tapering into the night—has begun to warp under the growing weight of renewable energy,” Knorring wrote in an article.

Solar power, which now contributes more than 2,000 megawatts to the national grid from almost nothing a decade ago, is responsible for a growing midday glut and sharp evening price spikes.

From 11 a.m. to 2 p.m., the market sees such a surplus of solar generation that Wholesale Electricity Spot Market (WESM) prices sometimes fall to near-zero or even negative levels.

In the evening, when demand remains high but solar generation disappears, prices spike again as the grid relies on aging coal and diesel facilities.

The shape of the resulting “intraday price curve” now resembles a dove more than the “duck curve” seen in solar-heavy markets like California, with a sagging midday and a sharp evening “neck,” according to Knorring.

“This dove is unlikely to herald news of a peaceful safe harbour,” he said.

The Philippines’ renewable energy expansion has come with growing pains, particularly in the form of volatility linked to both supply patterns and weather variability.

While hydropower is technically dispatchable, it remains subject to the country’s unpredictable rainfall, and Philippine solar generation is inconsistent due to tropical storms and cloud cover.

Compounding the issue is a lack of flexible power infrastructure.

“There are peakers and baseload plants, but few nimble assets capable of ramping up and down quickly,” Knorring said.

Natural gas, considered an ideal flexible source, is still largely unavailable, with liquefied natural gas imports only beginning to arrive.

Battery storage remains costly and largely limited to pilot programs and remote island systems, leaving the grid vulnerable to sharp and sudden supply-demand imbalances.

The Philippine WESM has seen not only intraday but also intranodal price volatility, where different regions experience varying prices due to congestion and localized generation issues.

This makes forecasting increasingly difficult for traders and distribution utilities, who must now rely as much on weather modeling as on traditional demand planning.

“Filipino consumers are riding a rollercoaster of volatility—daylight discounts followed by twilight penalties,” Knorring said.

Without investments in grid flexibility, large-scale storage, and financial hedging tools, experts warn that the clean energy transition could trigger more economic instability than environmental gain.

Knorring, who founded Green Tiger Markets, the country’s first forward energy marketplace, emphasized the need for smarter energy infrastructure and pricing tools to stabilize this emerging green economy.

“The age of renewables is here,” he said, “but without nimble grid architecture, more sophisticated storage solutions and a broader adoption of financial hedging products, the country risks turning a clean energy revolution into a chaotic price experiment.”