Heirloom Carbon Secures $150M to Scale Revolutionary CO2 Removal Tech
The Urgent Need for Carbon Capture Solutions
With global temperatures surpassing 1.5°C above pre-industrial levels this year - breaching the Paris Agreement’s critical threshold - the race is on to develop effective carbon removal technologies. The consequences of unchecked warming include:
- More frequent and severe droughts, floods, and wildfires
- Intensified hurricane activity
- Accelerated spread of infectious diseases
- Dramatic declines in biodiversity
Among the startups tackling this challenge, Heirloom Carbon has emerged as a leader, announcing a $150 million Series B funding round to scale its innovative approach.
Heirloom’s Breakthrough Technology
Unlike most direct air capture (DAC) companies that use liquid solvents, Heirloom employs a mineral-based solution:
- Process: Uses crushed lime derived from limestone
- Innovation: Proprietary treatment accelerates CO2 absorption
- Cycle: Absorbed gas converts lime back to limestone, which is then heated to release pure CO2 for storage
The Economics of Carbon Removal
Current costs remain high but show promising downward trends:
| Metric | Current Cost | Projected Cost (Early 2030s) | Target Cost |
|---|---|---|---|
| Price per metric ton | \(600-\)1,000 | \(200-\)300 | $100 |
“Heirloom has line of sight to profitability at those prices,” said company spokesperson Scott Coriell, noting the company is on track to eventually reach the $100/ton industry sweet spot.
Strategic Partnerships and Investors
The funding round attracted major climate tech investors and corporate partners:
Lead Investors:
- Future Positive
- Lowercarbon Capital
Notable Participants:
- Microsoft (existing customer)
- Frontier (Stripe’s climate initiative)
- Japan Airlines (signaling aviation industry interest)
Japan Airlines’ involvement is particularly significant, as DAC may offer airlines a more practical decarbonization path than expensive e-fuels.
The Road Ahead
Heirloom’s Louisiana plant, scheduled to open in 2026, represents a major scaling opportunity. While carbon removal technologies currently face cost barriers, climate scientists increasingly agree they’ll be essential for meeting global climate targets as fossil fuel use continues.
This funding round positions Heirloom as a key player in the emerging carbon removal industry, with its mineral-based approach offering distinct advantages in scalability and cost reduction potential.
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