In 2022, Ireland built a pedestrian bridge from two wind-turbine blades that were too difficult to recycle

On a quiet greenway between Midleton and Youghal in County Cork, Ireland, walkers and cyclists cross a small footbridge without giving it a second look. But this bridge is not made of ordinary steel girders and wooden planks. It is supported by two blades from a decommissioned wind turbine.

According to MaREI, Ireland’s national research center for energy, climate and marine research, the Re-Wind Network installed the bridge on January 26, 2022, using two LM13.4 blades that had been removed from Nordex N29 wind turbines at the end of their operational life.

Why old wind blades are such a headache
Wind power has become an increasingly important source of electricity in the United States. But it has an odd contradiction. A turbine’s steel tower and internal components can be easily recycled. The blades can’t. They're made of fiberglass or carbon fiber composite bonded with a thermoset resin that is meant to be light, strong, and weather-resistant for decades outdoors. That durability is also the problem: the resin can’t be melted down and reformed like steel, nor can it be just reheated and remelted like thermoplastics. Recycling the blade is usually far more expensive than landfilling it because the fibers have to be separated from the cured resin by energy-intensive methods such as grinding, pyrolysis, or chemical breakdown.


According to a peer-reviewed study co-authored by NREL wind energy analyst Aubryn Cooperman, the study's estimates are based on a typical turbine having a 20-year working lifetime, after which the blades are usually retired even though the fiberglass and resin they are made from are still structurally sound.

The same study found that the United States is projected to produce about 2.2 million tons of cumulative blade waste by 2050. Most retired blades are simply cut up and dumped in landfills, and the waste won’t be spread evenly for the time being. The study found it will be concentrated in the wind-heavy states already generating the most turbine power, adding pressure to landfills that were never built to handle thirty-meter composite beams.

The engineering behind the idea
The Cork bridge didn't just appear out of nowhere. It is based on an earlier feasibility study undertaken by the Re-Wind Network, a collaborative research project between the Georgia Institute of Technology, Queen’s University Belfast and University College Cork. According to an engineering paper presented at the International Symposium on Fiber-Reinforced Polymer Reinforcement of Concrete Structures, researchers first tested whether decommissioned blades could work as bridge beams at all, using a hypothetical 8.5-meter design built from a different pair of retired turbine blades than the ones later used in Cork.

Their code-based structural analysis revealed that the design used only around 61 percent of the blades’ maximum strength when subjected to the additional load, with a comfortable safety margin, and that it fulfilled the strength and deflection limits laid down in European structural codes. That early result suggested decommissioned blades could be used as structural material and informed the shorter, five-meter bridge later constructed in Cork using a different blade model.

How two blades became a bridge
That research was easy enough to translate, at least conceptually, into an actual structure. Each blade had a wide root end which sat on a concrete abutment on either side of the crossing, and the narrower tip was anchored into the ground for support. Then a walking deck was built over the top of the two blades, to create the surface that people actually use. The finished bridge has a span of about five meters, the same MaREI report noted. It doesn't look experimental. From afar you might think it was just a regular footbridge, only constructed of something most construction crews would have hauled to the dump on their first day.

The report adds that the bridge was built on a former train-track bed between Midleton and Youghal, where workers removed the old railway bridge and installed the new crossing in its place. It also says the blades were reused as the main girders, with the deck built above them to carry walkers, cyclists and emergency vehicles.

Why this matters for American readers
This is not just an Irish oddity. The US has one of the biggest wind fleets in the world, and a large chunk of that infrastructure is expected to reach retirement age in the next two decades. This problem is already beginning to hit communities in wind-heavy states visibly, with old blades piling up in municipal landfills meant for household trash, not thirty-meter composite beams.

The Cork project shows us another way forward. Separately, Re-Wind Network's own engineering research suggests that a retired blade, instead of being disposed of as waste, can serve as a structural material for small public infrastructure like footbridges, a potential alternative to landfill burial, though the studies don't quantify cost savings.

A small bridge, a bigger message
The Cork bridge alone won’t fix the renewable-energy industry’s waste problem. It’s one footbridge on one greenway. But it is proof that a "waste" material is often simply an unsolved design problem. As more wind farms come online to help meet clean-energy goals, the question of what happens to a blade after its 20-to-25-year lifespan will remain important.

For now, one quiet stretch of an Irish greenway offers a small but working answer: instead of burying the problem, engineers found a way to walk right over it.