Evaluating only Ebb Carbon’s profile at its peak — without knowing the outcome — the model ranked Unit economics as the #1 likely cause. Documented cause: Regulation.
Key Events Timeline
FOUNDING
Ebb Carbon founded in Seattle to develop ocean alkalinity enhancement as a scalable, ocean-based carbon dioxide removal method.
FUNDING
Raised $20M Series A from Congruent Ventures, Grantham Foundation and others; launched pilot operations off Washington State coast.
REGULATORY ACTION
EPA and NOAA regulatory review of ocean alkalinity enhancement took 18+ months longer than expected, blocking scale-up.
SHUTDOWN
Ebb Carbon shut down in late 2024, unable to secure premium carbon credit contracts to cover high electrochemical operational costs.
Full Analysis
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Documented cause
Ebb Carbon, a Seattle-based ocean-based carbon removal startup using electrochemical ocean alkalinity enhancement (OAE), raised $20M in Series A from Congruent Ventures and others in 2022. The company shut down in late 2024 after struggling to secure carbon credit buyers willing to pay the premium prices needed to cover its high operational costs. Regulatory approval timelines for ocean-based interventions in US waters proved far longer than projected.
Lesson
“Ocean carbon removal needs regulatory pre-clearance and committed credit buyers before scaling operations.”