Climate tech firm to launch scaled-up plant sucking CO2 from air

  • The new “Mammoth” plant will contain around 80 large blocks of fans and filters that suck in air and extract its CO2.

Construction is due to begin on Wednesday on what could become the world’s biggest plant to capture carbon dioxide from the air and deposit it underground, the company behind the nascent green technology said.

Swiss start-up Climeworks AG said its second large-scale direct air capture (DAC) plant will be built in Iceland in 18-24 months, and have capacity to suck 36,000 tonnes of CO2 per year from the air.

That is a sliver of the 36 billion tonnes of energy-related CO2 emissions produced worldwide last year. But it is a 10-fold increase from Climeworks’ existing DAC plant, currently the world’s largest, and a leap in scale for a technology that scientists this year said is “unavoidable” if the world is to meet climate change goals. 

The new “Mammoth” plant will contain around 80 large blocks of fans and filters that suck in air and extract its CO2, which Icelandic carbon storage firm Carbfix then mixes with water and injects underground where a chemical reaction turns it to rock. The process will be powered by a nearby geothermal energy plant.

Co-CEO Christoph Gebald said once this plant launches, Climeworks intends to build a far bigger facility capturing roughly half a million tonnes of CO2 per year — and then replicate multiple plants of that size, backed by project financing, towards the end of the decade.

Mammoth was part-financed by a 600 million Swiss Franc ($627 million) financing round Climeworks announced in April. The firm also sells among the world’s most expensive carbon removal credit — costing up to 1,000 euros per tonne — to buyers including Microsoft, Audi and Boston Consulting Group.

“It’s the cost of scaling up,” Gebald told Reuters. “This is, so to say, the investment we have to do as a company to move forward.”

The world currently has 18 direct air capture facilities, according to the International Energy Agency. U.S. oil firm Occidental also plans to launch a large-scale DAC facility, in late-2024, to collect 1 million tonnes per year of CO2.

The U.N.’s Intergovernmental Panel on Climate Change has said energy-intensive and costly technologies like DAC will be needed to remove CO2 on a large scale in the coming decades, to limit global warming to 1.5C and avoid increasingly severe climate impacts.

Heleen De Coninck, an IPCC author and professor at Eindhoven University of Technology, said DAC must be powered by CO2-free energy to be useful, and should not replace urgent reductions in greenhouse gas emissions.

“It can backfire if it leads to avoiding doing what’s necessary right now,” she said.

Climeworks AG is a Swiss company specializing in carbon dioxide air capture technology. The company filters the CO₂ directly from the ambient air through an adsorption-desorption process.
Climeworks AG is a Swiss company specializing in carbon dioxide air capture technology. The company filters the CO₂ directly from the ambient air through an adsorption-desorption process.

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