Near Amsterdam, glare off 78,000 solar panels grounded landings for two hours a day, so a Dutch court ordered a third of the farm torn out by autumn
Just before 10 a.m. on a clear morning in March, air traffic controllers closed a runway.
Not for snow or fog, but for sunshine.
The glare came from the ground.
The airport wanted all 230,000 panels gone, but the judge found the other two fields had not been proven to be the main source of the glare, and left them standing.
Below the approach path sat a field of glass the size of hundreds of soccer pitches.
Pilots lining up to land said the reflected light was blinding them at the worst possible moment.
So what in that field actually bent sunlight into a cockpit?
Why did a solar farm blind pilots from the ground up?
The physics is simple enough to explain in a sentence: a flat sheet of glass angled toward a low sun behaves like a mirror, and when that mirror sits directly beneath a landing flight path, the reflected beam travels straight into a cockpit. Ordinary solar glass is built to be lightly textured, which maximizes how much light the cells absorb for power.
But that same smoothness throws a sharp, concentrated reflection rather than scattering it harmlessly across the sky. So the problem was never the presence of panels near a runway. It was the specific glass coating chosen for this one.
A Dutch court found that cost considerations had taken precedence over safety when lightly textured glass panels were installed instead of the deeply textured type recommended for sites near flight paths, concluding the developer bore responsibility for that choice. Deeply textured glass scatters sunlight in many directions instead of bouncing it in one beam, the same reason frosted glass does not throw a reflection the way a clean window does.
A field of glass under a landing corridor
The farm sits beside the A9 motorway near the village of Zwanenburg, built across roughly 247 acres of former farmland that used to grow crops, not electrons. That places it squarely beneath the final approach to two runways, the Polderbaan and the Zwanenburgbaan.
Spread across that ground are close to 230,000 individual panels, wired to produce a serious amount of power. The installation produces up to 130 gigawatt hours of electricity per year, enough to power around 40,000 homes.
That is not a token community array. It is a utility scale plant that happened to land in the one place on the map where a mirror effect carries real consequences, with no buffer zone to absorb the mistake once the reflection problem surfaced.
The evidence that forced a courtroom reckoning
The airport did not act on a hunch. Pilots had been filing reports since the previous autumn, and the pattern was precise enough to track by the calendar.
At certain times of the year, sunlight reflecting off the panels is so intense that pilots are temporarily unable to see, prompting runway closures at the airport. That pattern escalated months before the lawsuit, and the airport authority and airline KLM took the case to court in a bid to have some of the panels dismantled.
With no fix agreed among the farm’s owner, the municipality and national regulators, the airport operator pressed its case before a judge in Haarlem. As DutchNews reported, the dispute reached court only after warnings about the farm’s glare risk went unresolved.
The court ordered the removal of 78,000 panels, citing a serious safety risk from glare. The operator must remove half by September 1 and the rest by October 15, or face penalties of up to 50 million euros, roughly 54 million dollars. The panels had already forced repeated runway closures, including 13 in March alone.
Where the ruling stopped short
The court did not order the whole farm demolished. The airport wanted all 230,000 panels gone, but the judge found the other two fields had not been proven to be the main source of the glare, and left them standing.
So two of the farm’s four fields kept generating power while the other two came down panel by panel. The developer warned the financial hit could sink the company entirely, since dismantling even a third of the array strips out revenue already borrowed against to build it.
It is the same tension running through solar project acquisitions everywhere, where land, permits and physical risk rarely line up the way a spreadsheet assumes. Meanwhile the fix chosen for the remaining panels was not removal but disguise, as they will be covered with an anti reflective film and reinstalled, letting the park keep operating.
What a sun angle still decides each year
The case also exposed how temporary any fix tied to the sun’s position really is. The original restriction was withdrawn after a few weeks because the sun’s position no longer caused glare that impeded air traffic, but it was already evident that the sun’s angle later in the year would cause glare again.
A solar farm’s worst flaw can vanish for months and return on schedule as the seasons turn, the same blind spot that makes forecasting solar output across a calendar year so difficult for grid planners. Regulators have since moved to stop the next version of this problem before it reaches a runway, announcing a national glare standard for solar farms near airports built on a prudence criterion stricter than the aviation guidance this farm was originally checked against.
The Netherlands had no glare rules of its own when the farm was approved, only borrowed guidance never built for Dutch sun angles and runway geometry. None of that undoes the months of disrupted landings or the costs still being argued over.
But the fix that emerged, a coating of anti glare film rather than a wrecking ball, suggests that even a mistake this visible from a cockpit window can still be solved without losing the clean power the panels were built to deliver.
Hugo is an engineer with strong technical expertise. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.
