Heirloom Carbon Technologies
Overview
Heirloom Carbon Technologies is a United States-based climate technology company focused on removing carbon dioxide from the atmosphere through direct air capture (DAC). Founded in 2020 and headquartered in Brisbane, California, Heirloom has emerged as one of the leading innovators in the carbon dioxide removal (CDR) space. The company's mission centers on permanently removing legacy carbon emissions from the atmosphere to help combat climate change and limit global warming, aiming to remove one billion tons of CO2 by 2035.
Heirloom's approach distinguishes itself from many other direct air capture companies by leveraging the natural mineralization properties of limestone. Rather than relying solely on energy-intensive mechanical systems, the company accelerates a naturally occurring chemical process, making atmospheric carbon capture faster, more scalable, and more cost-effective.
Continue…Core Technology
At the heart of Heirloom's operations is its enhanced weathering technology using limestone (calcium carbonate). The fundamental science relies on the natural ability of certain minerals to absorb carbon dioxide from the air. Under normal conditions, this natural process of mineral weathering can take years. Heirloom has developed a method to dramatically accelerate this process so that it happens in a matter of days.
The process works as follows:
- Limestone is heated in renewable-energy-powered kilns, which separates the material into calcium oxide and carbon dioxide.
- The captured concentrated carbon dioxide released during this heating stage is stored permanently, often through injection into underground geological formations or embedded into concrete.
- The remaining calcium oxide powder is spread onto large vertical trays and exposed to ambient air.
- Over the course of several days, the calcium oxide naturally binds with atmospheric carbon dioxide, transforming back into limestone.
- The carbon-saturated limestone is then returned to the kiln, and the cycle repeats, allowing the same material to be reused again and again.
This closed-loop system allows the minerals to act as a sponge, repeatedly capturing carbon dioxide directly from the atmosphere. By using renewable energy to power the kilns and optimizing the exposure of the mineral to air, Heirloom maximizes efficiency while minimizing its own carbon footprint.
Products and Services
Carbon Dioxide Removal Credits
Heirloom's primary offering is the sale of high-quality, verifiable carbon removal credits to businesses seeking to address their carbon footprints. Unlike carbon offsets that avoid or reduce future emissions, Heirloom's credits represent the actual, permanent removal of carbon dioxide that already exists in the atmosphere. These credits appeal to companies with net-zero and carbon-negative commitments that require durable, measurable carbon removal solutions.
Permanent Carbon Storage Solutions
The company provides end-to-end carbon removal that includes not just the capture of carbon dioxide but also its permanent storage. Heirloom partners with storage specialists and technology providers to ensure that the captured CO2 is sequestered for the long term, either through geological storage deep underground or through mineralization in building materials such as concrete, where the carbon becomes permanently locked away.
Direct Air Capture Facilities
Heirloom designs, builds, and operates commercial-scale direct air capture facilities. In 2023, the company opened its first commercial DAC facility in Tracy, California, marking a significant milestone as one of the first operational direct air capture plants of its kind in the United States. The company continues to expand its facility footprint to scale up its removal capacity.
Notable Partnerships and Projects
Heirloom has secured a range of high-profile partnerships and commitments that underscore its position in the carbon removal industry:
- The company signed a landmark agreement with Microsoft, which committed to purchasing large volumes of carbon removal from Heirloom as part of Microsoft's carbon-negative goals.
- Heirloom collaborated with Stripe and other members of the Frontier advance market commitment, a coalition dedicated to accelerating the development of carbon removal technologies.
- The company has worked with CarbonCure Technologies to store captured carbon dioxide permanently within concrete.
- Heirloom is a partner in Project Cypress, a Direct Air Capture Hub in Louisiana that received significant funding support from the United States Department of Energy as part of federal efforts to advance carbon removal at scale.
Funding and Investment
Heirloom has attracted substantial investment from prominent venture capital firms and climate-focused funds. The company raised a significant Series A funding round led by investors including Breakthrough Energy Ventures, the climate investment fund founded by Bill Gates. Other backers have included Ahren Innovation Capital, Carbon Direct Capital, Prelude Ventures, and Lowercarbon Capital. This financial backing has enabled Heirloom to scale its technology from laboratory research toward commercial deployment.
Sustainability and Environmental Commitment
A defining characteristic of Heirloom's operations is its dedication to genuine, additional carbon removal. The company emphasizes transparency, third-party verification, and measurability in its carbon accounting. By powering its facilities with renewable energy and using abundant, naturally available limestone, Heirloom seeks to keep its process both environmentally sound and economically viable.
The company is committed to reducing the cost of direct air capture over time, targeting a price point that would make large-scale carbon removal affordable enough to have a meaningful impact on global carbon dioxide concentrations. Heirloom's leadership frequently stresses that carbon removal is not a substitute for reducing emissions but a necessary complement to decarbonization efforts, particularly for addressing historical emissions and hard-to-abate sectors.
Industry Position and Outlook
Heirloom Carbon Technologies occupies a prominent role in the rapidly growing carbon dioxide removal sector. As governments, corporations, and international bodies increasingly recognize the need for large-scale carbon removal to meet climate targets, companies like Heirloom are positioned at the forefront of an emerging industry. Its limestone-based approach offers a potentially lower-cost pathway to scale compared to some competing technologies, and its early commercial deployments have demonstrated the practical viability of its methods.
Looking ahead, Heirloom aims to dramatically expand its capacity, building larger facilities and reducing per-ton costs as it works toward its ambitious billion-ton removal goal. The company continues to be a key player in shaping the future of climate technology and the broader effort to achieve a stable, sustainable global climate.
