SeaO2

What SeaO2 does

SeaO2 is a Netherlands-based Direct Ocean Capture (DOC) startup founded in 2021 as a spin-off of TU Delft and Wetsus, headquartered at the Matrix Innovation Center on Amsterdam Science Park. The company has developed an electrochemical process — Bipolar Membrane Electrodialysis (BPMED) — that uses only renewable electricity and seawater (no added chemicals, high temperature, or pressure) to extract dissolved CO2 from seawater; the acidified stream releases gaseous CO2 that is captured, while the alkaline stream neutralizes the discharge water before it is returned to the ocean, where it re-absorbs atmospheric CO2. SeaO2's product surface spans three project stages — Project Ripple (1 tCO2/year prototype), Project Swell (25 tCO2/year containerized pilot in commissioning at Scheveningen Harbor) and Project Breaker (250 tCO2/year pilot planned) — with a long-term ambition to reach 1 Mt/year by 2030 and 1 Gt/year by 2045.

Commercially, SeaO2 operates two business lines: (1) Carbon Dioxide Removal (CDR), where captured CO2 is permanently stored (geological sequestration via European storage partners, or mineralization in concrete through Paebbl) and sold as high-quality carbon removal credits verified under Isometric's DOCS protocol; and (2) CO2 Utilisation, where the captured "Blue CO2" and "Green CO2" are sold as feedstock for industrial applications including sustainable aviation fuel (via a partnership with Transavia Ventures and the €1.64M TKI e-SAF consortium with TU Delft, University of Twente and NERA), green methanol, chemicals, food and beverage, and concrete mineralization. Pre-commercial revenue to date is limited to €240K in pre-sales of carbon credits to Klarna and Ledgy ahead of product launch; the company secured over €2M in seed funding in November 2024 and is targeting a €20M Series A by 2026.

Go-to-market is enterprise-led: the Chief Commercial Officer runs direct outreach to corporations with irreducible emissions in hard-to-abate sectors (aviation, shipping, cement, steel, chemicals), supported by MRV-grade data collection (sensor-based seawater chemistry, ocean modeling, lifecycle analysis) and policy advocacy across the mCDR Coalition, DAC/DOC Coalition, CO2 Value Europe, and the Negative Emissions Platform. Customers include Klarna (fintech), Ledgy (SaaS), and Transavia Ventures (aviation), with co-located pilots at Afsluitdijk (with REDstack) and Scheveningen, plus R&D collaboration with Wageningen Marine Research, NIOZ, Deltares, and Waardenburg Ecology through the DOCKER consortium. The team is ~17 people including a CEO, CTO, CCO, CSO, and Head of Oceanography & MRV.

Name

SeaO2

Legal name

SeaO2

Website

https://seao2.com

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

1–10 employees

Short description

SeaO2 is a TU Delft/Wetsus spin-off that uses electrochemical Direct Ocean Capture (BPMED) to extract CO2 from seawater and sell verified carbon removal credits and green CO2 feedstock to enterprises with hard-to-abate emissions, primarily in Europe.

Ownership category

akta.pro rank

Product category

Carbon Dioxide Removal / Carbon Capture Technology

NAICS

Industrial Gas Manufacturing (32512)

SIC

Chemicals & Allied Products (2800)

akta.pro primary industry

Ocean-Based Carbon Removal (Alkalinity Enhancement, Seaweed, Ocean Biomass Sinking) (EUABAFAF)

akta.pro secondary industries

CO₂‑Derived Synthetic Fuels for Aviation & Marine (SAF e‑fuels, e‑ammonia/e‑methanol bunkering pathways) (EUABAIAH), CO₂‑to‑Chemicals (C1/C2+ chemicals: formic acid, CO, syngas, ethylene/propylene pathways) (EUABAIAC)

Keywords

• Ocean carbon removal
• Direct ocean capture
• Carbon removal credits
• Electrochemical CDR
• Green CO2 utilization

Headquarters

HQ city

Amsterdam

HQ country

Netherlands

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Carbon Removal Credits (CDR): Sale of high-quality carbon removal credits to corporations seeking to neutralize irreducible emissions. Credits verified under Isometric's DOCS protocol. €240K in pre-sales secured before commercial product launch.
2. Green CO₂ Sales (Utilization): Sale of captured CO₂ as a feedstock for industrial applications: sustainable aviation fuels, green methanol, concrete mineralization, chemicals, food/beverage, agriculture. Blue CO₂ marketed as a valuable resource.
3. R&D and Grant Funding: Government and institutional funding for technology development. €1.64M TKI Energy and Industry grant for e-SAF development. CIEIF grant of $75,000 for community engagement. Seed funding of €2M+.

Pricing tiers

Go-to-market motion4 records

Distribution channels4 records

Marketing channels8 records

Core offering

SeaO2 performs electrochemical Direct Ocean Capture (DOC) to extract dissolved CO₂ from seawater using renewable electricity and Bipolar Membrane Electrodialysis, with no added chemicals, heat, or pressure. The captured CO₂ is either permanently stored (geological sequestration or concrete mineralization) and issued as high-quality carbon removal credits, or sold as Blue/Green CO₂ feedstock for industrial use in sustainable aviation fuels, green methanol, chemicals, food/beverage, and agriculture. The company operates modular containerized pilot systems (Project Ripple 1 t/yr, Project Swell 25 t/yr, planned Project Breaker 250 t/yr) and scales toward 1 Mt/yr by 2030 and 1 Gt/yr by 2045.

Product overview

SeaO2 operates as a Direct Ocean Capture (DOC) technology company offering two primary services: Carbon Dioxide Removal (CDR) for permanent carbon sequestration with carbon credit sales, and CO2 Utilisation through the sale of captured Blue CO2 and Green CO2. Their DOC technology uses electrochemistry and seawater processing to extract CO2, with the decarbonized water returned to the ocean to absorb additional atmospheric CO2. The captured CO2 can be permanently stored or sold for industrial applications. The company is scaling through three project phases: Project Ripple (prototype, 1 tCO2/year), Project Swell (containerized system, 25 tCO2/year), and Project Breaker (pilot facility, 250 tCO2/year planned).

Differentiator

Problem solved

Functional benefit

Products and services

• Carbon Dioxide Removal (CDR) Credits High-quality, verifiable carbon removal credits generated by extracting CO₂ from seawater via electrochemical Direct Ocean Capture (DOC) and permanently storing it in geological formations or mineralizing it into concrete. Sold to corporations to neutralize irreducible operational emissions and meet net-zero commitments. Verified under Isometric's DOCS protocol by independent Validation and Verification Bodies.
• Blue CO₂ (Utilisation – direct-use applications) Captured CO₂ from SeaO2's DOC process sold as a renewable feedstock for direct-use industrial applications including food, beverages, packaging, agriculture, and greenhouses. Positioned as a sustainable alternative to fossil-derived industrial CO₂.
• Green CO₂ (Utilisation – converted fuels and chemicals) Captured CO₂ from SeaO2's DOC process sold for conversion into alternative fuels (green methanol, sustainable aviation fuels/e-SAF) and chemicals (ethylene, alcohols, formic acid, formate, syngas, urea), supporting decarbonization of hard-to-abate industries such as aviation, shipping, and chemicals.

Quantifiable outcome

• 25 tonnes CO₂/year capacity (Project Swell pilot, operational 2025)
• +6 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

41 partnerships are on record, tiered core and minor.

• PaebblcoreStrategic or Co-development PartnerConcrete mineralization partnership. Captured CO₂ transformed into sustainable concrete through Paebbl for permanent sequestration. Contributed to successful prototype demonstration.
• FLIE (Fieldlab Industrial Electrification)coreStrategic or Co-development PartnerPartnership to integrate DOC technology into Power-to-X initiatives for maritime sector decarbonization, contributing to green fuels production.
• Svašek HydraulicscoreTechnology or IntegrationDeveloped high-resolution 3D modeling for dilution patterns of decarbonized seawater. Nested models into large-scale tidal model to study mixing zones and ocean acidification impacts. Based in Rotterdam.
• Platform ZerocoreStrategic or Co-development PartnerCDR acceleration partnership in South Holland. Organized CDR session with Skytree, TNO, and Provincie Zuid-Holland to design Fieldlab ecosystem. Focus on combining CCU with CCS.
• TU DelftcoreStrategic or Co-development PartnerCo-founding academic institution. SeaO2 spin-off from TU Delft. Joint €1.64M TKI project for e-SAF development. R&D collaboration on electrochemical DOC technology.
• University of TwentecoreStrategic or Co-development PartnerPartner in €1.64M TKI e-SAF project. Expertise in electrochemical conversion and catalysis. Joint study on public perceptions of marine carbon removal.
• NERAcoreStrategic or Co-development PartnerPartner in €1.64M TKI e-SAF project. Contributes to decentralized e-SAFs development.
• Wageningen Marine ResearchcoreStrategic or Co-development PartnerPart of DOCKER consortium under TKI Deltatechnologie. Conducts marine ecological studies and will study ecological effects of seawater processing.
• DeltarescoreStrategic or Co-development PartnerPart of DOCKER consortium. Provides advanced ocean modeling to simulate decarbonized water dispersion and CO₂ re-equilibration. Expertise in water and coastal systems.
• Waardenburg EcologycoreStrategic or Co-development PartnerPart of DOCKER consortium. Specialist in ecology, biodiversity, and environmental design for responsible mCDR scaling.
• NIOZ (Royal Netherlands Institute for Sea Research)coreStrategic or Co-development PartnerSupports DOCKER consortium with laboratory analyses. National oceanographic institute providing marine systems, climate, and biodiversity expertise.
• University of Exeter (SeaCURE)coreStrategic or Co-development PartnerAdvisory role in DOCKER consortium. SeaCURE project expertise in marine mCDR science. Global leader in sustainability and marine science.
• WetsuscoreStrategic or Co-development PartnerSeaO2 spin-off institution alongside TU Delft. Academic research center for water technology where DOC technology was originally developed.
• REDstackcoreStrategic or Co-development PartnerCo-location partner at Afsluitdijk facility. Existing seawater pumping infrastructure shared with SeaO2, enabling focus on core technology validation.
• IsometriccoreStrategic or Co-development PartnerCarbon credit certification partnership. SeaO2 among first companies to issue credits under DOCS protocol. MRV framework co-developed with input from SeaO2's MRV team.
• CO₂ Value EuropecoreChannel Partner/ Reseller/ DistributorIndustry association membership. Access to CCU network, policy advocacy, funding opportunities, and visibility among EU policymakers. SeaO2 showcased technology at CO₂ Value Europe Days.
• Negative Emissions PlatformcoreChannel Partner/ Reseller/ DistributorIndustry association member. Participated in 'Invest in Carbon Removals' roadshow events in Amsterdam and Paris. CDR ecosystem building with investors and buyers.
• Carbon Business CouncilcoreChannel Partner/ Reseller/ DistributorNon-profit trade association member. Co-chair of mCDR Coalition alongside World Ocean Council. Policy advocacy and CDR community building.
• CEEZERminorChannel Partner/ Reseller/ DistributorSelected for CEEZER's Carbon Coalition 2nd cohort. Partnership to accelerate carbon removal market growth and customer onboarding.
• Ocean VisionscoreChannel Partner/ Reseller/ DistributorSelected for Ocean Visions Launchpad Cohort #2. Daan Reijnders participated in 'Lessons from the Launchpad' session at Biennial Summit in Vancouver. Accelerator program support.
• BlueInvest (EU)coreGTM or Marketing PartnerSupported by EU BlueInvest initiative. Coaching, strategic guidance, investor readiness refinement, commercial strategy development. Featured by European Commission article.
• World Ocean CouncilcoreStrategic or Co-development PartnerCo-chair of mCDR Coalition alongside Carbon Business Council. Part of SEAO2-CDR project for international awareness and engagement in mCDR sector.
• CapturaminorStrategic or Co-development PartnerDOC peer company. Collaborated on shaping Isometric's DOCS protocol development. Part of mCDR Coalition.
• CarbonBlueminorStrategic or Co-development PartnerDOC peer company. Contributed to Isometric's DOCS protocol development alongside SeaO2 and Captura.
• CarbyonminorStrategic or Co-development PartnerDAC startup partner in DAC/DOC Coalition. Joint policy advocacy with European Commission and EU policymakers.
• SkytreeminorStrategic or Co-development PartnerDAC startup partner in DAC/DOC Coalition. Partner in Platform Zero CDR session in South Holland.
• Matrix Innovation CenterminorStrategic or Co-development PartnerAmsterdam Science Park location. Hub for science, innovation, and entrepreneurship. Home to SeaO2's headquarters from April 2025.
• Campus@sea (Scheveningen)minorStrategic or Co-development PartnerHost organization at Scheveningen harbor. Director Jan-Hendrik Schretlen supports SeaO2 as valuable new user and innovation ecosystem partner.
• Municipality of The HagueminorOthersMunicipality committed to water-based innovation and blue economy growth. Philip Mulder endorsed SeaO2 as fitting Port Vision 2025-2050.
• Utrecht UniversityminorStrategic or Co-development PartnerJoint study on public perceptions of marine carbon removal. Zamin Syed shared findings at mCDR symposium. Part of responsible mCDR pathway development.
• TNOminorStrategic or Co-development PartnerDutch research organization. Partner in Platform Zero CDR session. Co-host of 9th CO₂ Value Europe Days. R&D collaboration in CCU.
• Gemeente RotterdamminorOthersMunicipal government participant in Platform Zero CDR session in South Holland.
• Port of RotterdamminorStrategic or Co-development PartnerPort authority participant in Platform Zero CDR session. Key stakeholder in CCU/CCS ecosystem.
• InnovationQuarterminorStrategic or Co-development PartnerRegional economic development agency for South Holland. Participant in Platform Zero CDR session.
• Netherlands Enterprise Agency (RVO)minorOthersGovernment agency participant in Platform Zero CDR session. Presenter on IPKV Innovation Programme Carbon Removal.
• FMEminorStrategic or Co-development PartnerDutch industry association participant in Platform Zero CDR session.
• EBN B.V.minorStrategic or Co-development PartnerEnergy transition company participant in Platform Zero CDR session in South Holland.
• Division QminorStrategic or Co-development PartnerPartner participant in Platform Zero CDR session in South Holland.
• Zero Emission FuelsminorStrategic or Co-development PartnerZero-emission fuels company participant in Platform Zero CDR session in South Holland.
• everoxminorStrategic or Co-development PartnerCDR company participant in Platform Zero CDR session in South Holland.
• PaebblminorStrategic or Co-development PartnerCarbon utilization company participant in Platform Zero CDR session.

Scale indicators12 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Captura: Captura is a California-based Direct Ocean Capture startup using electrochemical processes to extract CO2 from seawater. As a fellow DOC pioneer and Isometric DOCS protocol co-developer alongside SeaO2, Captura is the most direct technical and commercial peer.
• CarbonBlue: CarbonBlue is an Israeli ocean-based carbon removal company developing scalable CO2 extraction from seawater. It collaborated with SeaO2 on Isometric's DOCS protocol and is a direct peer in the mCDR Coalition ecosystem.

Emerging players

• Ebb Carbon: Ebb Carbon is a US-based ocean CDR company using electrochemical ocean alkalinity enhancement. While it uses a different capture mechanism, Ebb is a close mCDR peer competing for the same corporate CDR credit buyers and regulatory frameworks.
• Carbyon: Carbyon is a Dutch DAC startup that, like SeaO2, is a founding member of the DAC/DOC Coalition. While focused on direct air capture rather than ocean capture, it is a regional peer in the EU CDR policy ecosystem and competes for similar Dutch/EU grant funding.
• Skytree: Skytree is a Dutch/EU DAC startup that partners with SeaO2 in the DAC/DOC Coalition and Platform Zero. It is a regional peer working on decentralized CDR with overlapping Dutch and EU policy positioning, though focused on air rather than ocean capture.
• Running Tide: Running Tide is a US-based ocean CDR company that uses kelp sinking and ocean alkalinity enhancement. It is an emerging mCDR peer in the broader marine carbon removal category, though it uses biological rather than electrochemical methods.

Broad incumbents

• Climeworks: Climeworks is the world's most-funded direct air capture company and operates the largest DAC facility (Mammoth in Iceland). It is a broader incumbent in CDR competing for the same corporate offtake market (Microsoft, Shopify, etc.) but uses air rather than seawater.
• Heirloom Carbon: Heirloom is a US-based DAC company using limestone-based capture technology and backed by Microsoft and Frontier. It is a broad CDR competitor targeting similar corporate buyers with a different capture mechanism (DAC vs DOC).
• Carbon Engineering: Carbon Engineering (acquired by Occidental Petroleum / 1PointFive) is a pioneering large-scale DAC company operating the STRATOS facility in Texas. It represents an established incumbent in the broader carbon removal market competing for corporate offtake.

Others

• Paebbl: Paebbl is a carbon utilization startup that partners with SeaO2 on concrete mineralization of captured CO2. It is an adjacent player in the CCU value chain rather than a CDR competitor, providing a downstream sink for SeaO2's captured CO2.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/seao2-io
• Xx.com/SeaO2_io
• Facebookfacebook.com/SeaO2

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Funding overview

Funding rounds3 records

Investors6 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SeaO2