# Heirloom Carbon

a limestone CaO/CaCO3 mineralization loop accelerated by enzymatic humidification; it raised USD 150 million in 2026 and operates the first direct air capture facility in the United States.

Source: https://en.bioecon.ru/companies/heirloom-carbon/
Updated: 2026-06-30

- Country: United States

## Verifiable facts

| Fact | Value | Source |
| --- | --- | --- |
| Funding | $150 million Series B raised in 2024 | https://carbonherald.com/heirloom-secures-150m-to-accelerate-direct-air-capture-scaling/, https://www.canarymedia.com/articles/carbon-removal/heirloom-raises-150m-for-its-limestone-based-carbon-removal-tech |
| Capacity | 1,000 tons of CO2 per year (Tracy, California facility) | https://www.canarymedia.com/articles/carbon-removal/heirloom-raises-150m-for-its-limestone-based-carbon-removal-tech, https://www.heirloomcarbon.com/news/heirloom-unveils-americas-first-commercial-direct-air-capture-facility, https://www.heirloomcarbon.com/projects |
| Capacity | 17,000 tons of CO2 per year (Louisiana, phase 1) | https://www.heirloomcarbon.com/projects, https://www.opportunitylouisiana.gov/news/heirloom-carbon-technologies-announces-475-million-investment-to-establish-north-americas-second-direct-air-capture-facility-in-louisiana |
| Capacity | 100,000 tons of CO2 per year (Louisiana, phase 2) | https://www.heirloomcarbon.com/projects |
| Capacity | 200,000 tons of CO2 per year (Louisiana, phase 3) | https://www.heirloomcarbon.com/projects |
| Production site | Tracy, California | https://www.canarymedia.com/articles/carbon-removal/heirloom-raises-150m-for-its-limestone-based-carbon-removal-tech, https://www.heirloomcarbon.com/news/heirloom-unveils-americas-first-commercial-direct-air-capture-facility, https://www.heirloomcarbon.com/projects |
| Production site | Port of Caddo-Bossier, Louisiana | https://esgnews.com/heirloom-carbon-technologies-secures-475-million-for-north-americas-second-direct-air-capture-facility-in-louisiana/, https://www.heirloomcarbon.com/projects, https://www.opportunitylouisiana.gov/news/heirloom-carbon-technologies-announces-475-million-investment-to-establish-north-americas-second-direct-air-capture-facility-in-louisiana |

Independent sources: canarymedia.com, carbonherald.com, esgnews.com, opportunitylouisiana.gov

## Technologies

- [DAC with biointegration (hybrid bio-DAC)](https://en.bioecon.ru/technology/hybrid-bio-dac/)