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deal · 14 January 2026
Frontier ↔ Pronoe
Frontier: an option to buy of 333 t of ocean alkalinity enhancement removal from Pronoe.
BuyerFrontier
SupplierPronoe
Tonnes333 t
Capture pathwayOcean alkalinity enhancement
Storage mediumocean-dissolved
Commitment typeoption
Deal structureofftake
Source pathway descriptionOcean alkalinity enhancement (OAE). Modular water-treatment units designed to connect to desalination plants and other coastal facilities. Systems work by dissolving crushed limestone into seawater using an electrically driven process, producing an alkaline discharge that increases ocean alkalinity and enhances the ocean's ability to absorb CO2. Design avoids lime calcination and on-site CO2 stora
Storage descriptionOcean alkalinity enhancement; CO2 absorption by seawater
Project locationCoastal facilities (company is French)
NotesPre-purchase agreement. Part of combined $3.05m commitment to Pronoe and Cella. Frontier's first deal with a French carbon removal company. Intended to support company in moving from pilot-stage deployments to commercial scaling by funding equipment buildout and data-collection efforts.
Durability defaultedtrue
Tonnes notetonnes trued to the Frontier portfolio page, 2026-09-01
Previous durabilitydurable-1000y
Previous durability basispathway-default
Durability notePathway default removed; duration requires source evidence
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More: Pronoe · Ocean alkalinity enhancement