Do Solar Flares Have An Impact On Solar Power Generation?

The energy from fast rotating body normally generates explosive bursts called Solar Flares from the surface of the Sun. These types of bursts happen around Sunspot's and release tremendous amounts of radiation as a result of the quick release of stored magnetic energy. Solar Flares also produce Coronal Mass Ejections (CMEs), wherein vast amounts of charged particles are expelled into space by solar bursts.

If Earth is directly affected by either or both, then geomagnetic storms happen on Earth, which disrupts radio and satellite transmissions and may potentially affect the electric grid.

All Solar Flares are given designations of X-Class, to determine strength, so when the last two X1.2 Solar Flares occurred there were many shortwave radio blackouts throughout SE Asia and Australia. In 2026, one M5.7 Solar Flare was responsible for disrupting HF radio transmission/effects and produced a CME directed at Earth. Scientific observation suggests that the Sun may be "overdue" for an S-Class Superflare (magnitude > X10). The first chances of occurrence are projected to be Mid 2025 through Mid 2026.

Contrary to a common misconception, solar flares do not give solar panels an extra "boost" of energy. In fact, the radiation from a powerful flare can interfere with photovoltaic cells, creating an imbalance in charge that decreases cell efficiency and reduces power production.

However, the direct threat to ground-based solar panels is relatively limited. Solar panels themselves contain minimal electronics, which puts them at low risk of damage from electromagnetic pulses or direct flare radiation. The real vulnerability lies elsewhere.

For space-based solar arrays - on satellites and spacecraft - the story is different. High-energy protons from solar flares can cause sudden, step-function drops in array output. Research has shown that solar proton flares can have an almost immediate effect on solar array efficiency. In 2003, a large solar storm led to an average 3% drop in power for all of EUMETSAT's geostationary spacecraft. The degradation from solar flare protons takes the form of sudden drops of 3% or more, while electron-induced degradation is steady and gradual. NASA research has also demonstrated that radiation damage caused by solar-flare protons can be partially "annealed out" - a thermal process that repairs some of the damage - potentially avoiding billions in lost power sales revenue over satellite lifetimes.

Although the solar panels themselves will not be affected too much due to the solar storm, the components that help deliver the electricity from those panels to consumers will suffer extreme impacts from the solar storm. Geomagnetically induced currents (GIC) can potentially flow through long power transmission lines with the possibility of damaging transformers, causing reactive power losses, possibly causing power to collapse catastrophically and resulting in large-scale blackouts.

For example, the 1989 Quebec Power Outage was one of the most well-known geomagnetic storm-related outages and was as far south as New Jersey at a transformers were damaged. The risk of a Carrington-like event today, like the solar storm of 1859, could cause global disruptions for satellites, GPS, and power grids (solar farms included). These disruptions to power will actually have the adverse effect of causing solar generation from solar farms to cease due to electrical damage occurring to the electronics controlling solar power from being delivered onto the grid.

In terms of potential hazards, the solar panels installed in photovoltaic systems produce electricity, while the inverters and transformers can turn that energy into an electrical output compatible with the electrical grid's alternating current (AC). Ageing components of a solar farm, such as the inverters and transformers, can be subjected to potential electrical failure due to age or mechanical failure. When a geomagnetic storm strikes, it can create a volatile electrical environment that could damage existing faulty (aged) components of a solar farm. Such events can greatly increase the risk of total failure among these components.

Beyond hardware damage, solar flares affect solar power generation in more subtle ways. Flares can disrupt the GPS and satellite communications that many solar monitoring and grid management systems rely on. When high-frequency radio communications are blacked out - as happened during the May 2026 M5.7 flare - remote monitoring and control of distributed solar assets can be compromised.

Grid operators are increasingly incorporating space weather alerts into their planning. In Texas, ERCOT recently canceled a market notice tied to a geomagnetic warning from federal space weather forecasters, demonstrating that the threat is real even for southern grids. Utilities track space weather alerts and can modify operations when needed, but the challenge is that predicting solar flares and geomagnetic storms remains extremely difficult.

For those concerned about whether solar flares reduce the actual sunlight reaching their panels, the news is reassuring. While the 11-year solar cycle does cause fluctuations in extraterrestrial irradiance - the sunlight reaching Earth's upper atmosphere - the effect is remarkably small. The peak of the solar cycle increases extraterrestrial irradiance by only about 1 watt per square metre, roughly one-tenth of one percent when averaged over a year. This variation is dwarfed by the predictable 3.5% seasonal fluctuation caused by Earth's elliptical orbit. "There is very little value in attempting to even include the effect in solar irradiance modelling calculations," according to solar resource experts.

Preparing for the Storm

As Solar Cycle 25 continues to intensify, the solar industry is taking the threat seriously. Manufacturers are designing more radiation-hardened electronics for inverters and monitoring systems. Grid operators are developing mitigation strategies, including the ability to isolate vulnerable transformers during geomagnetic storms. And researchers continue to study the physics of solar activity to improve forecasting.

For homeowners with rooftop solar, the practical advice is straightforward: the panels themselves are hardy and unlikely to be damaged by all but the most extreme events. The bigger concern is grid stability. Keeping phones charged, having emergency kits ready, and staying informed about space weather alerts are prudent steps.