Problems blow in for turbines
Wind turbine blades can’t be recycled, so they’re piling up in landfills.
Awind turbine’s blades can be longer than a Boeing 747 wing, so at the end of their lifespan they can’t just be hauled away.
First, you need to saw through the lissome fiberglass using a diamond-encrusted industrial saw to create three pieces small enough to be strapped to a tractor-trailer.
The municipal landfill in Casper, Wyo., is the final resting place of 870 blades whose days making renewable energy have come to end. The severed fragments look like bleached whale bones nestled against one another.
“That’s the end of it for this winter,” said waste technician Michael Bratvold, watching a bulldozer bury them forever in sand. “We’ll get the rest when the weather breaks this spring.”
Tens of thousands of aging blades are coming down from steel towers around the world, and most have nowhere to go but landfills. In the U.S. alone, about 8,000 will be removed in each of the next four years. Europe, which has been dealing with the problem longer, has about 3,800 coming down annually through at least 2022, according to BloombergNEF.
It’s going to get worse: Most were built more than a decade ago, when installations were less than a fifth of what they are now.
Built to withstand hurricaneforce winds, the blades can’t easily be crushed, recycled or repurposed. That’s created an urgent search for alternatives in places that lack wide-open prairies. In the U.S., they go to the handful of landfills that accept them, in Lake Mills, Iowa; Sioux Falls, S.D.; and Casper, where they’ll be interred in stacks that reach 30 feet under.
“The wind turbine blade will be there, ultimately, forever,” said Bob Cappadona, chief operating officer for the North American unit of Paris-based Veolia Environnement SA, which is searching for better ways to deal with the massive waste. “Most landfills are considered a dry tomb.”
“The last thing we want to do is create even more environmental challenges.”
To prevent catastrophic climate change caused by burning fossil fuels, many governments and corporations have pledged to use only clean energy by 2050. Wind energy is one of the cheapest ways to reach that goal.
The first models were expensive and inefficient, spinning fast and low. After 1992, when Congress passed a tax credit, manufacturers invested in taller and more powerful designs. Their steel tubes rose 260 feet and sported swooping fiberglass blades.
A decade later, General Electric Co. made its 1.5 megawatt model — enough to supply 1,200 homes in a stiff breeze — an industry standard.
Wind power is carbon-free and about 85 percent of turbine components, including steel, copper wire, electronics and gearing can be recycled or reused. But the fiberglass blades remain difficult to dispose of.
With some as long as a football field, big rigs can carry only one at a time, making transportation costs prohibitive for long-distance hauls. Scientists are trying to find better ways to separate resins from fibers or to give small chunks new life as pellets or boards.
In the European Union, which strictly regulates material that can go into landfills, some blades are burned in kilns that create cement or in power plants. But their energy content is weak and uneven and the burning fiberglass emits pollutants.
In a pilot project last year, Veolia tried grinding them to dust, looking for chemicals to extract.
“We came up with some crazy ideas,” Cappadona said. “We want to make it a sustainable business. There’s a lot of interest in this.”
One startup, Global Fiberglass Solutions, developed a method to break down blades and press them into pellets and fiber boards to be used for flooring and walls. The company started producing samples at a plant in the Texas community of Sweetwater, near the continent’s largest concentration of wind farms. It plans another operation in Iowa.
“We can process 99.9 percent of a blade and handle about 6,000 to 7,000 blades a year per plant,” Chief Executive Officer Don Lilly said.
The company has accumulated an inventory of about one year’s worth of blades ready to be chopped up and recycled as demand increases, he said.
“When we start to sell to more builders,” he added, “we can take in a lot more of them. We’re just gearing up.”
Until then, municipal and commercial dumps will take most of the waste, which the American Wind Energy Association in Washington says is safest and cheapest.