View original ↗on finance.yahoo.com
deal · 7 May 2025
Microsoft ↔ Carba
Microsoft: a firm purchase of 44,000 t of biochar removal from Carba.
BuyerMicrosoft
SupplierCarba
Tonnes44,000 t
Capture pathwayBiochar
Storage mediumsoil
Commitment typefirm
Deal structureofftake
Source pathway descriptionCarba's novel pyrolysis technology and burial method removes carbon dioxide, storing biochar underground in low-oxygen environments based on a patented, highly efficient pyrolysis reactor. Carba's autothermal technology offers greater energy efficiency, stabilizing carbon from biogenic waste and turning it into economically valuable biochar with high carbon content. The biochar will be used as an
Storage descriptionBiochar buried in local landfill in low-oxygen anoxic environment; 1,000-year durability certification by Isometric
Delivery window5 years; retirements starting in 2025
Project locationOakton, Virginia (Carba headquarters location; project with waste disposal company converting municipal wood waste)
VerificationIsometric
Notes44,000 carbon removal credits over 5-year period. Project previously received $7 million grant from U.S. Department of Energy for Carbon Negative Shot Pilot (FOA 382). Potential environmental co-benefits including odor reduction and pollutant remediation in landfill operations.
Durability defaultedtrue
Previous durabilitydurable-100y
Previous durability basispathway-default
Durability notePathway default removed; duration requires source evidence
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