Can Solar Panels Still Work During a Super El Niño?

PAGASA has been warning since mid-2026 that a very strong El Niño is likely to build from around October 2026 to early 2027, and could last into the first half of 2027. You'll see it called a "Super El Niño" in the news. That isn't an official term, but it's used for El Niño events where Pacific temperatures run more than about 2°C above normal.

For the Philippines, that usually means below-normal rainfall, longer dry spells and hotter days, especially once the habagat season ends. Check PAGASA's latest advisories for your area, since forecasts get updated every month.

Both. Solar panels run on sunlight, not heat, and El Niño tends to bring clearer skies and fewer rainy days, so the panels get more light to work with. In a normal year, the cloudy, rainy months are when output dips, and during a strong El Niño there are fewer of those days. But El Niño also brings more heat, and heat works against panels, as the next section explains.

For your bill, timing matters too. Solar peaks around midday, which covers a good part of daytime aircon use. Aircon demand often stays high into the late afternoon and evening, though, when solar is fading, and that part still comes from the grid or a battery.

More than most people expect. Solar panels work best when it's bright but cool. They're rated at 25°C, and they're most efficient at roughly 15 to 35°C. Above that, efficiency drops: most panels lose about 0.3 to 0.5 percent of their output for every degree Celsius the panel itself heats up past 25°C.

On a hot roof, panels can reach 60 to 65°C at midday. During a heatwave, that can cut efficiency by around 10 to 25 percent compared with the rating on the label. This happens on every hot Philippine afternoon, not only during El Niño, and a good installer already accounts for it when sizing a system. What El Niño changes is that you get more of those hot, clear days: more light, but more heat with it.

In a hot country like ours, the panel itself matters too. Every panel's datasheet lists a temperature coefficient, which tells you how much output it loses per degree of heat. The smaller the number, the better it handles hot roofs. Most quality panels today sit between about -0.24% and -0.35% per °C. For example, Jinko's Tiger Neo N-type, one of the brands we install, is rated at -0.29% per °C. When you compare quotes, it's worth asking for this number.

Probably, yes. Rain normally rinses dust off the panels for free. With weeks of dry weather, dust, pollen, ash and bird droppings build up and block some of the sunlight. Panels near roads, construction or farmland get dirty faster.

• Check your panels or your inverter app every few weeks during the dry season. If output drops on clear days, it's probably time to clean.
• Clean early in the morning or late in the afternoon, when the panels are cool. Cold water on hot glass isn't a good idea.
• Use plain water and a soft brush or sponge. No pressure washers, no harsh detergents.
• If the panels aren't easy and safe to reach, don't climb up. Ask your installer to do it.

This is the bigger concern. During long dry spells, hydropower plants have less water to work with, and the heat pushes power demand up. When supply gets tight, the grid goes on yellow or red alert, and rotating brownouts become more likely.

Here's the part people don't expect: a grid-tie system switches off during a brownout, even with the sun out. To keep the power on, you need a hybrid system with a battery. More in what happens to solar during a brownout.

• Already have solar? Book a cleaning and system check before the hottest months.
• Have grid-tie and worried about brownouts? Ask whether your inverter is battery-ready, so you can add backup.
• Thinking of going solar? The dry season is a good time to install, since there are fewer rain delays.

Request a free solar assessment, or contact us to book a cleaning and check-up.