View original ↗on alt-carbon.com
deal · 15 November 2025
Mitsui O.S.K. Lines ↔ Alt Carbon
Mitsui O.S.K. Lines: a firm purchase of 10,000 t of enhanced rock weathering (agricultural) removal from Alt Carbon.
BuyerMitsui O.S.K. Lines
SupplierAlt Carbon
Tonnes10,000 t
Capture pathwayEnhanced rock weathering (agricultural)
Storage mediumocean-dissolved
Commitment typefirm
Deal structureofftake
Source pathway descriptionEnhanced Rock Weathering (ERW), which involves sourcing waste basalt rock and spreading it across agricultural farmlands. The basalt reacts with carbon dioxide dissolved in rainwater; permanently storing the carbon dioxide as stable bicarbonate ions. Over time, these ions travel through river networks to the ocean, where they eventually reside as calcium carbonate (CaCO₃), in the form of corals &
Storage descriptionPermanent storage as stable bicarbonate ions traveling through river networks to the ocean, residing as calcium carbonate (CaCO₃) in the form of corals and seashells for over 10,000 years.
Delivery windowMulti-year agreement; first tranche delivered within 8 months of signing offtake agreement
Project locationDarjeeling, India
VerificationIsometric (Enhanced Weathering Protocol)
NotesAlt Carbon's Darjeeling Revival Project. First tranche of CDR credits issued from flagship project. Multi-year offtake agreement signed; first verified CDR credit issuance announced 15 November 2025, delivered within 8 months of signing. Project involves 60,000 acres onboarded in six months with lab capacity to issue 100,000 carbon credits from 2026. Early buyers include Frontier (Stripe-led AMC),
Durability defaultedtrue
Previous durabilitydurable-1000y
Previous durability basispathway-default
Durability notePathway default removed; duration requires source evidence
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