'MAYBE' TECH

US outlines vision for cheap, large-scale carbon capture technology
By Nick Lavars
November 07, 2021

Capturing carbon dioxide from the air is currently expensive, but a new venture from the US Department of Energy aims to change that

Preventing global warming from reaching dangerous levels will require dramatic steps to reduce the amount of carbon dioxide pouring into the atmosphere, but many see removing and safely storing what is already there as another critical part of the solution. A new initiative from the US Department of Energy (DOE) makes these technologies a key pillar in its plan to tackle climate change, outlining ambitions to significantly drive down the cost and foster innovations that allow for storage on a mass scale by mid-century.

Though the idea has been around for decades, the idea of extracting carbon dioxide from the air has gathered momentum in the past few years, largely on the back of startups making some key inroads in the space. A notable example is Swiss startup Climeworks, whose Direct Air Capture (DAC) systems collect CO2 from the ambient air and turn it into solid minerals that can be stored underground.

This technology was brought to life in the world's first negative emission power plant in 2017, and earlier this year the company opened the world's largest DAC plant in Iceland. Called Orca, the plant has the capacity to harvest around 4,000 tons of CO2 from the air each year. For context, humans pump out more than 30 billion tons, or 30 gigatons, into the air on a yearly basis.

So while the technology has been successfully demonstrated on a small scale, the world would need many Orcas to properly put a dent in the problem. And then comes the cost. Climeworks was able capture a ton of CO2 for around US$600 when it first opened its negative emissions plant in 2017, but by using a modular design for its DAC systems, expects this cost to come down toward $100 per ton as it scales up operations.

And this price point is a commonly held target among carbon capture startups. Canadian company Carbon Engineering is currently working on a large-scale DAC plant capable of capturing up to one million tons of CO2, and hopes to do so for a cost of $94 to $232 per ton. Australian startup Southern Green Gas plans to tap into the country's abundant sunlight to fuel solar-powered DAC plants that collect tons of carbon for as little as $72 a piece.

The US Department of Energy has been making moves to help things along, last year investing $22 million into research efforts that advance carbon capture technology, followed by a further $24 million this year. Its latest venture in this space is called the “Carbon Negative Shot" and is described as the US government's first major effort in carbon dioxide removal, and key to its plans of achieving net zero emissions by 2050.

The initiative centers on the ambition of deploying carbon capture technologies on a gigaton scale by 2050. According to the DOE, a gigaton of CO2 is around the amount generated by 250 million vehicles, or the US's entire light-duty fleet, each year. Getting the technology to this point would require some significant developments both in the technology itself and the capacity to deploy it on a massive, unprecedented scale.

The DOE hopes that through its Carbon Negative Shot program, it can give this burgeoning industry the shot in the arm it needs. Part of its efforts to accelerate innovation in the area will involve working with individual communities that might benefit from or be willing to take part in carbon capture programs. Ultimately, the venture aims to reduce the cost of carbon removal and storage to less than $100 per ton.

“By slashing the costs and accelerating the deployment of carbon dioxide removal – a crucial clean energy technology – we can take massive amounts of carbon pollution directly from the air and combat the climate crisis,” says Secretary of Energy Jennifer M. Granholm. “With our Carbon Negative Shot, we can help remove the greenhouse gases already warming our planet and affecting our health – positioning America as a net-zero leader and creating good-paying jobs for a transitioning clean energy workforce. The combination of the Carbon Negative Shot with our massive investments in hydrogen, battery storage, renewables and decarbonized fossil energy, can make net-zero emissions a reality here and abroad.”

Source: US Department of Energy