Leilac and Heirloom sign agreement to employ electric kiln technology at future direct air capture facilitie


Heirloom’s Direct Air Capture process powered by Leilac’s renewably powered electric kiln.  

Heirloom, a direct air capture (DAC) company permanently removing carbon dioxide (CO2) from the atmosphere, and Leilac, a decarbonization technology partner, have signed licence and collaboration agreements to deploy renewably-powered electric kilns at future Heirloom DAC facilities.

Heirloom will employ Leilac’s electric kiln technology to heat limestone to produce high purity CO2, which will go for permanent storage, and calcium oxide, which is looped through Heirloom’s process to remove CO2 from the atmosphere.

In welcoming the announcement, Leilac CEO, Daniel Rennie said, “These agreements establish the collaborative foundation for a partnership that combines two complementary technologies and a shared ambitious and purpose-driven culture.

“Our rapid progress is testament to the dedication and ingenuity of both the Leilac and Heirloom teams. Together, we have the potential to deliver a significant impact on removing legacy emissions while also creating an accelerated pathway for the electrification of hard-to-abate industries, such as cement and lime.”

Heirloom CEO, Shashank Samala agreed, “Heirloom is committed to having our DAC facilities run on renewable energy and we’re excited to further a partnership with Leilac to achieve low-cost carbon removal at future facilities on the way to achieving gigaton scale.”

Following the signing of a memorandum of understanding in February 2023, Leilac and Heirloom have progressed the integration of Leilac’s electric calcination and CO2 capture technology into Heirloom’s DAC plants through an extensive research and development campaign. This work is informing the design of new commercial DAC facilities.

Mutual benefits for decarbonization and DAC 

Applying Leilac’s technology to Heirloom’s DAC process enables the DAC industry to leverage many years of technology investment and development from Leilac and its parent company Calix, the European Union and partners across the cement and lime industries.

With double the current combined capture capacity of all DAC facilities globally[1], Leilac’s pilot plant is the largest operating carbon capture facility for cement in the world, outside China. A Leilac demonstration plant, with a designed capture capacity of 100,000 tonnes of CO2 per year, is due for construction in 2024. Cement is responsible for ~8% of global CO2 emissions, with most of these emissions being directly and unavoidably released from the raw material.

Mr Rennie continued, “Leilac is excited to apply our core technology, developed for and with the cement and lime industries, to DAC. In turn, we expect our partnership with Heirloom will accelerate the development of electric calcination, as we work with all our partners in support of a just-transition towards an industrially sustainable low-carbon society. It’s a win-win arrangement that aims to maximise the scale and speed at which we can reduce industrial and atmospheric CO2.”

Prevent, reduce, remove: a shared approach to CO2 mitigation 

Leilac and Heirloom’s partnership is designed to support a range of CO2 mitigation efforts. The electrification of mineral processing, including cement, lime, iron and steel and critical minerals, can enable a transition from carbon-intensive to renewable energy inputs, preventing future emissions and improving air quality for local communities.

Some hard-to-abate industries, such as cement and lime, produce CO2 as an unavoidable by-product of raw material processing. For these industries, effective and low-cost carbon capture and storage is essential to reduce emissions.

But decarbonizing alone will not be enough to achieve global climate goals. The Intergovernmental Panel on Climate Change projects that carbon dioxide removal in the order of 1–10 billion tonnes of CO2 per year could mitigate residual emissions and, in most scenarios, achieve net negative emissions to return global warming to 1.5°C, following a peak.

Leilac and Heirloom’s collaboration seeks to actively develop and support solutions across the three priorities to prevent, reduce and remove carbon dioxide emissions.

Supporting sustainable local industry 

A just transition to net zero requires solutions that balance social, economic and environmental sustainability. Low-cost and scalable CO2 mitigation solutions can help maintain the competitiveness of industry in a low-carbon economy. Scaling decarbonization solutions for essential industries like cement and lime will also help support and maintain sustainable local industrial manufacturing bases.

Ultimately, Leilac and Heirloom’s projects are designed to be delivered through local firms using local resources, supporting local jobs in a just transition to sustainable industry.



Heirloom is developing the fastest path to low-cost, permanent CO2 removal by harnessing limestone. With a cost of approximately US$10-$50/tonne, limestone is inexpensive and easy to source. Combined with highly-modular, easy-to-manufacture facilities, Heirloom’s solution is built to scale quickly to meet the urgency of climate action.

Leilac’s calcination technology efficiently separates and captures carbon dioxide from limestone to produce decarbonized lime. Its unique indirect heating approach requires no additional chemicals or processes and can be directly powered by renewable electricity. By keeping the process CO2 emissions pure, Leilac’s technology removes the need to separate gases from gases, enabling it to target the lowest cost solution for the capture of CO2 from limestone.

Leilac’s technology is proven at pilot scale, including through its pilot plant, Leilac-1, and three smaller electric units. In operation since 2019, Leilac-1 has a capture capacity of 25,000 tonnes of CO2 per year and is currently the largest carbon capture installation for cement in the world, outside China. Leilac-2, a demonstration plant with a capture capacity of 100,000 tonnes of CO2 per year is due to be constructed in 2024. Multiple engineering studies are in progression for full-scale installations of the Leilac technology at cement plants with capture capacities of ~1 million tpa of CO2.

Heirloom and Leilac’s combined DAC approach 

Heirloom’s DAC technology uses lime in a novel carbonation process to directly capture CO2 from the air and form limestone. This process accelerates the natural binding of CO2 and lime from a period of years to just three days.

After binding and removing CO2 from the air, the reformed limestone is fed back into the renewably powered Leilac kiln, where the CO2 is separated and captured, and the cycle begins again.

The CO2 removed from the air will be mineralised, where it is bound to rocks or other materials, or injected underground into existing natural geological structures, where it remains safely and permanently stored.

The integrated Heirloom and Leilac DAC solution will be 100% renewably powered to deliver the maximum net reduction of atmospheric CO2.

About Leilac 

Leilac is the collaborative technology partner accelerating a just transition to net zero by providing the most compelling decarbonization solution for global cement and lime.

Leilac’s technology is being developed to efficiently separate unavoidable carbon emissions ready for use or storage, without additional chemicals or processes. It is designed to be scalable, retrofittable, energy agnostic and electrification ready, providing flexible and economical pathways to carbon free cement and lime.

Operating across Europe, the Americas and Asia Pacific, Leilac has imagined the future for sustainable cement and lime. And we’re creating it. Today.

For more information, visit www.leilac.com

About Heirloom 

Heirloom builds low-cost Direct Air Capture technology that will permanently remove CO2 at a billion-ton scale. Our technology rapidly accelerates the natural ability of minerals to absorb CO2 from the air from a timespan of years to days. Heirloom has the only operating Direct Air Capture facility in North America, and its customers are the world’s biggest buyers of carbon removal including Microsoft, Stripe, Klarna, Shopify and more. Heirloom is funded by Bill Gates’ Breakthrough Energy Ventures, Carbon Direct Capital, Ahren Innovation Capital, Prelude Capital, Lowercarbon Capital and others.

See how Heirloom’s technology works here.

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