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More Wind Turbine Towers Being Made of Eco-Friendly Wood

in POSITIVE NEWS
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More Wind Turbine Towers Being Made of Eco-Friendly Wood
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New methods for joining together lumber is opening the door to a variety of construction projects long since closed off to wood—most recently wind turbines.

A 330-foot (100-meter) prototype wooden wind turbine is being made in the land of wooden innovation, Sweden, to reduce the substantial carbon footprint of manufacturing a wind turbine from steel.

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But how can a structure so battered with wind and gravity be made of a material that can be broken by a human with a machete? The answer is laminated veneer lumber (LVL), a wood construction product that is made by bonding three millimeter sheets of peeled spruce under intense heat and pressure to create flexible timber material stronger than steel, but lighter and less carbon-intensive.

Made by Stora Enso, one of the world’s oldest timber companies, LVL was used in 2020 to build a 130-foot (30-meter) prototype wind turbine tower. Hefty curved slabs of LVL are made and shipped to the build site where they are then glued together to form the tall cylinder onto which the spinning blades will be mounted.

Wood can reduce the CO2 emissions in creating a tower by 90% while also storing carbon dioxide that has been taken up by trees during their growth. Wood selected for transformation into LVL is taken from mature trees that have already absorbed the largest reasonably achievable amount of CO2 they’re able to.

RELATED: Wind And Solar Generated a Record 10% of the World’s Power in 2021 – Victory for Paris Agreement

The wood used for advanced constructions such as wind turbine towers can be reused in new wood-based products which provides further long-term climate benefits by continuing to jail the carbon within their fibers.

Modivon is a Swedish firm that builds towers, and they see three major benefits compared with steel for building turbines.

“Wood has a higher specific strength which enables a lighter construction. High steel towers need extra enforcement to carry their own weight—which wooden towers don’t need. And finally, modular steel towers demand a vast number of bolts that need regular inspections while our modular wooden towers are joined together with glue,” Modivon write.

MORE: Portable Wind Turbine Fits in Your Backpack to Charge All Your Electronics – And Only Adds 3 Lbs

The towers would look about the same as a steel turbine, and not like a giant tree trunk due to an applied waterproof paint layer. At the moment, capturing carbon, done when the trees are turned into LVL, is more important than reducing emissions, since any reduction in emissions today won’t be felt in the global carbon cycle for far longer than any current predictions on warming or temperature changes. It’s only through actively taking emissions out of the cycle that are already there that humanity can change Earth’s climate.

Still, as long as humanity is building wind turbines to reduce emissions from energy use, we might as well reduce them from manufacturing too.

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