Wind turbine blades are one of the industry's harder waste problems: each blade can be as long as a Boeing 747's wingspan, built from composite fiberglass that traditional recycling methods cannot break down. Discarding them in landfills has been the default disposal route. A 2021 peer-reviewed NREL study titled "Wind turbine blade material in the United States: Quantities, costs, and end-of-life options," by Aubryn Cooperman, Annika Eberle, and Eric Lantz, published in Resources, Conservation and Recycling, estimated that the US could accumulate about 2.2 million tons of blade waste by 2050. That 2021 estimate is the backdrop for a repowering project carried out the same year at Panther Creek III in West Texas, one of the earlier field examples of an alternative to landfilling, and worth revisiting now that repowering has become more common industry practice.
What actually happened out in West Texas
Panther Creek III is a wind farm located in West Texas that's been in operation since 2009, with 133 of GE's 1.5-megawatt turbines, owned by RWE Renewables. The site was "repowered" in 2021; that is, the blades were replaced with longer ones and the gearboxes upgraded without dismantling the turbine. Under a contract with GE Renewable Energy, Veolia North America removed the blades, lifting the farm's capacity from 199.5 megawatts to 215 megawatts, a roughly 8 percent gain achieved by upgrading the existing 133 towers rather than by adding new turbines. Because a longer blade increases the loads and bending moments a foundation has to carry, repowering projects like this one are engineered around modest blade-length increases the original towers can safely support, rather than a dramatic rotor upsize; that's part of why the capacity gain here is incremental rather than large.
