Enhanced Weathering (ERW) | Market Compass | 2026
- May 29
- 3 min read
Updated: Jun 15
Current Landscape
Enhanced Rock Weathering (ERW) has matured from an agronomic-pilot domain into an investable, registry-validated carbon-removal segment. As of March 2026, over $242 million has been committed or deployed across the ERW ecosystem, with 60+ deals tracked and 30+ developers actively progressing toward commercial scale. Activity is geographically distinctive: roughly 91% of validated near-term registry capacity sits in India and Brazil, with secondary footprints in the U.S., Germany, Kenya, and Mexico. The dataset tracks 189 ERW-specific patents across 14 active developers, with filings up nearly 9 times between 2021 and 2025 - signaling that the sector is moving from research orientation toward commercial deployment.
Verified delivery has begun. Through March 2026, two registries (Puro.earth and Isometric) have recorded ~9,735 tCO2 of ERW-specific issuances and ~3,083 t CO2 of retirements. Tropical projects - including Alt Carbon's Darjeeling Revival, Mati's Seoni programme, Terradot's Project Carcara, and InPlanet's Serra da Mantiqueira - are scheduled to scale into multi-thousand-tonne annual delivery between 2026 and 2028. The 60x ratio between contracted (~1.10 Mt) and retired tonnes is the single most consequential operational test the sector faces over this window.
Investments in Enhanced Weathering (ERW)
Capital deployment has shifted from venture-led seed-stage expansion to fewer, larger Series A and B rounds anchored on registry validation, demonstrated MRV, and binding offtake. Annual equity deal count grew from 1 in 2020 to a peak of 13 in 2024 before moderating to 4 in 2025 and 2 announced rounds in Q1 2026. Aggregate equity capital tracks the same arc - peaking at $138.5M in 2024 - while grant capital surged in 2025 with a vintage of $55M grants, anchored by Mati Carbon's $50M XPRIZE Carbon Removal grand-prize win.
Market Demand
Capital concentration remains high. Lithos Carbon, UNDO, Eion, InPlanet, Mati Carbon, Carbonaught, Alt Carbon, Carbonaide and Terradot. This is the highest-capitalised cohort, accounting for ~74% of cumulative funding of the tracked universe. Investor mix is broadening - hyperscaler strategic capital (Microsoft Climate Innovation Fund, Google, Amazon Climate Pledge Fund), institutional growth equity (BlackRock + Temasek via Decarbonization Partners, WestBridge Capital), cement-industry strategics (Holcim MAQER, Kajima Ventures), and philanthropic mission capital (XPRIZE, Carbon Removal Partners, Carbon Drawdown Initiative, Grantham Foundation, ACT) - all show repeat activity.
Demand concentration is acute on the buyer side. Microsoft, Frontier (Stripe-led consortium), and Google together account for ~88% of disclosed contracted volume. Financial services entry is meaningful in absolute terms (UBS, Barclays, BMO, Zurich Kantonalbank, AXA) but small in share. Foundation-led purchases (Climate Cent Foundation, Milkywire, Wild Assets) play a disproportionate early-validator role for emerging-market deployments. Notably absent: compliance buyers, oil-and-gas majors, and large sovereign-grade insurers - the first such ERW offtake would be a structural mainstreaming signal.
Verified delivery remains a fraction of contracted demand. Against ~1.10 Mt of contracted offtake, only ~3,083 t have been verified and retired across the two active registries. The credibility of forward pricing and forward capacity numbers therefore depends on whether the Darjeeling Revival, Seoni, Carcara, and Mantiqueira projects deliver verified tonnes at scale over 2026-2028.
cCarbon Viewpoint
ERW is transitioning from a commitment-led market to a delivery-led one. Capital formation has scaled, the financing mix remains pre-bankable, dominated by equity and grants, with debt still embryonic. With policy frameworks emerging, despite the continued absence of specific incentives for ERW, equal emphasis must now be placed on MRV-effective implementation at project scale and on converting contracted offtake into registry-retired tonnes.
The ERW sector remains highly sensitive to project-execution risk, not just policy design. While headline commitments signal strong buyer and investor support, the timing, reliability, and MRV cycle-time of registry-validated delivery are equally critical. A set of near-term milestones is expected to shape the next 18 months: first commercial-scale tropical ERW retirement at multi-thousand-tonne single-batch cadence; first non-Puro/non-Isometric ERW issuance via Verra; first ICVCM CCP label on an ERW methodology; and the first Article 6 Letter of Authorisation from a tropical ERW host country.
These milestones together will determine whether the sector can convert policy support and capital commitments into operational, registry-verified delivery. This transition from pilot-validated technology to bankable infrastructure will define ERW's trajectory toward asset-class maturity by 2028.
