Lightning Season Isn’t Over. Is Your Gamesa Fleet Ready for What’s Next?

For most of us, the end of summer means squeezing in the last vacation days, getting the kids back to school, and wondering where August went. For wind farm managers, it means something else: the fall maintenance window is here, and it’s the last easy stretch of weather before winter makes everything more complicated.

If you operate legacy Gamesa turbines, now is the time to think about lightning and static protection, before winter arrives and closes that window.

We are past peak, but not past risk

It’s tempting to file lightning risk under “summer problem, solved.” That’s exactly the mistake that catches operators off guard, because the calendar says risk is dropping while the storms haven’t gotten the memo yet.

• United States: an estimated 23.4 million cloud-to-ground lightning flashes strike the contiguous U.S. every year, concentrated in spring, summer, and early autumn (Bulletin of the American Meteorological Society, 2024).
• Canada: more than 2.25 million cloud-to-ground flashes annually, with July the peak month at roughly 900,000 flashes, and August close behind (Environment and Climate Change Canada).
• Mexico: lightning activity peaks during the summer rainy season, particularly July through September (American Meteorological Society, 2024).

None of that has stopped yet. It’s tapering, not over, and it’s tapering right as winter starts stacking a second set of risks on top of it: ice, wind loading, and shrinking maintenance windows. A turbine that goes into that stretch with an unresolved static or lightning issue isn’t catching a break. It’s running out of time to fix it before the weather makes the fix harder and more expensive.

The real cost isn’t the strike, it’s what happens after

A direct strike can cause obvious, visible damage. But static buildup and lesser electrical events are just as costly in practice: nuisance alarms, component degradation, and unplanned downtime that adds up quietly over a season.

According to DNV, the certification body behind the international lightning protection standard for wind turbines (IEC 61400-24), lightning damage is the single largest cause of unplanned downtime in wind turbines, and the most common insurance claim filed by wind farm owners.

The numbers back that up. Oak Ridge National Laboratory (ORNL), a U.S. Department of Energy lab, puts repair costs for lightning-damaged blades at $10,000 to $100,000 onshore, rising to as much as $1 million offshore (ORNL, 2024). Insurer AXIS Capital found lightning claims carry the longest downtime of any cause, averaging 233 days per closed claim.

For Gamesa turbines specifically, lightning-related costs can run to US$70,000 for a single G90 turbine, with blade damage accounting for the majority of breakdown costs on G8X, G9X, and G114 models (AP Renewables, “Lightning Can Strike Twice”).

That’s before you add the technician callout, sourcing and shipping a replacement part, getting a crane on site, and the production lost while all of that happens. Then comes the meeting where someone asks, “How did this happen?”, a meeting most site managers would rather not have.

Why legacy Gamesa turbines carry extra risk

Legacy Gamesa turbines have a specific vulnerability worth flagging: an air gap in the electrical path.

That gap interrupts what should be a continuous path to ground. Instead of dissipating safely, static charge can build up, putting sensitive components at greater risk during storm activity and contributing to weather-related alarms and shutdowns that aren’t triggered by a direct strike at all.

This is why lightning protection isn’t just about surviving a strike. It’s about maintaining a continuous, reliable electrical path so that ordinary storm activity doesn’t turn into downtime.

Fall is your window, and it’s closing

Right now, three things line up in your favor, and all three expire when winter sets in:

1. Workable weather, before winter conditions restrict access and extend every job.
2. Planned maintenance windows, your team is already mobilized for seasonal work, so this isn’t a separate trip.
3. A head start on winter, closing the gap now means one less unknown going into the season with the least forgiving conditions.

AP Renewables’ Static & Lightning Protection System (SLPS) was purpose-built for Gamesa turbines. The retrofit closes the air gap and maintains continuous electrical contact, reducing the risk of static buildup and electrical events turning into unplanned downtime.

You don’t need to wait for the next alarm to tell you there’s a problem, and by the time it does, the easy window to fix it may already be gone.

Talk to our team about scheduling an SLPS retrofit before winter.

Because winter has a way of making every maintenance job a little more interesting. Your turbine probably has enough personality already.