Kelson Marine

What Kelson Marine does

Kelson Marine is an ocean engineering services firm headquartered at 2 Portland Fish Pier in Portland, Maine, that specializes in designing and de-risking floating ocean structures for blue-economy industries. The firm's primary customer segments are aquaculture operators (finfish, shellfish, and macroalgae/seaweed farms) and ocean renewable energy developers (wave, tidal, floating offshore wind, and floating solar), with secondary practices in autonomous vessel design, heavy lift and marine operations, marine infrastructure, oceanographic sensing mooring design, and feasibility studies for ocean carbon dioxide removal.

The firm's technical foundation rests on model-based engineering, physics-based numerical simulation, and digital twin modeling using FAST, OpenFAST, and Orcaflex, supplemented by ten full-scale in-ocean validation datasets accumulated across multiple exposure conditions. Differentiated methods include an Exposure Index Calculator for site assessment, extreme-value probability contour analysis that quantifies actual survival load-case probabilities, and seasonal load analysis that can reduce anchor sizing by roughly half versus conservative assumptions. The firm has evaluated 11,200+ design and load cases and operates across four hemispheres. Named commercial customers include Umaro Foods, Ocean Rainforest, Riverine Tech, and Trophic, alongside research partnerships with the University of Maine, University of New England, ICES Working Group on Open Ocean Aquaculture, and government agencies including DOE Water Power Technologies Office and ARPA-E.

Kelson Marine operates a sales-led, project-based professional services model with custom quote-based pricing and no public pricing tiers. Revenue streams consist of engineering design and analysis services plus third-party certification and technical advising for impact investors, insurance providers, and portfolio managers. Go-to-market channels include industry conferences (Seagriculture EU, IPF Offshore Wind), peer-reviewed publications (Frontiers in Aquaculture, Journal of Algal Research), LinkedIn, and direct enterprise engagement. The company is privately held with no disclosed venture or private-equity funding; Toby Dewhurst serves as CEO.

Name

Kelson Marine

Legal name

Kelson Marine, Inc.

Website

https://kelsonmarine.com

Company type

Private

Operating status

Operating

Headcount range

1–10 employees

Short description

Kelson Marine is a Portland, Maine-based ocean engineering services firm that designs, validates, and certifies floating ocean structures for blue-economy clients including aquaculture operators, ocean renewable energy developers, and impact investors.

Ownership category

akta.pro rank

Product category

Ocean Engineering Services

NAICS

Support Activities for Water Transportation (4883)

SIC

Ship & Boat Building & Repairing (3730)

akta.pro primary industry

Project Management & Owner’s Engineering / Technical Consultancy (Spec Writing, Bid Support, Site Support) (IMAJAGAO)

akta.pro secondary industries

Stability, Weight & Load Analysis (Intact/Damage Stability, Weight Control) (IMAJAGAI), Safety, Risk & Compliance Engineering (SOLAS, Class Rules, HAZID/HAZOP, FMEA) (IMAJAGAJ), Aquaculture & Fish-Farm Service Vessels (Feed, Wellboats, Harvest Support) (IMAJADAF)

Keywords

• Ocean engineering services
• Marine structural design
• Aquaculture engineering
• Mooring system analysis
• Offshore wind engineering

Headquarters

HQ city

Portland

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Design and Analysis Services: Engineering services including structure design, engineering analysis, mooring analysis and design, optimization for maximum performance and minimum CapEx and OpEx, and aquaculture design. Services are provided to aquaculture farms, ocean renewable energy developers, research institutions, and impact investors.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Kelson Marine provides ocean engineering design and risk-mitigation services for floating ocean structures serving blue-economy industries. The firm delivers model-based engineering, structural design, mooring analysis, digital twin modeling, and full-scale in-ocean validation for aquaculture systems, marine renewable energy devices, floating solar arrays, and marine infrastructure. Services also include third-party certification, technical advising, and due diligence analysis for impact investors and insurance providers.

Product overview

Kelson Marine is an ocean engineering firm offering a portfolio of engineering services for blue-economy industries. The core offering consists of design and risk-mitigation engineering services for floating ocean structures, complemented by third-party certification and technical advising for impact investors. Key service areas include aquaculture engineering (finfish, shellfish, macroalgae), marine renewable energy (wave, tidal, floating offshore wind, floating solar), autonomous vessel design, heavy lift and marine operations, marine infrastructure, oceanography and sensing, and ocean carbon dioxide removal. The company also provides an Exposure Index Calculator tool for site assessment. Services leverage model-based engineering principles, digital twin modeling, field-validated simulation tools, and numerical modeling approaches. The company serves clients from feasibility studies through detailed design and certification.

Differentiator

Problem solved

Functional benefit

Products and services

• Engineering Design and Analysis Services Model-based engineering, structural design, mooring analysis, and optimization services for floating ocean structures including aquaculture systems, marine renewable energy devices, and marine infrastructure.
• Third-Party Certification and Technical Advising Independent verification, third-party review, and certification of ocean structures for insurance providers and portfolio managers, including Licensed Professional Engineer reviews and due diligence analysis for investors and startups.
• Risk Management Services Application and development of international standards and guidance for design and evaluation of aquaculture, marine renewable energy, and marine operations systems, including calculation of extreme loading and identification of high-risk components.
• Aquaculture Engineering Specialized engineering services for finfish, shellfish, and macroalgae/seaweed cultivation structures, including due diligence analysis, marine mammal risk assessment, catastrophic failure prevention, entanglement prevention, and performance and cost optimization.
• Marine Renewable Energy Services Engineering services for wave energy converters, tidal energy, floating offshore wind, and floating solar including metocean analysis, Annual Average Energy Production projections, wave tank testing, system integration, prototype testing, and digital twin modeling using FAST, OpenFAST, and Orcaflex.

Quantifiable outcome

• Kelp farming production costs can be reduced by 85% through redesign of structures and operations (from $2,618 to $383 per tonne)
• +2 more outcomes

Named customers4 records

Segments8 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Eleven partnerships are on record, tiered core and minor.

• University of MainecoreStrategic or Co-development Partner · 13 November 2025NSF-funded partnership on 'Digital Twins for the Blue Economy' project, involving internships in AI and digital twins. Collaboration on techno-economic optimization of large-scale seaweed farming at offshore wind sites for marine CDR.
• Alaska Mariculture ClustercoreStrategic or Co-development Partner · 24 March 20252-year contract titled 'De-Risking Investments in Aquatic Farming through Validated Regional Ocean and Wave Simulations Integrated with Model-Based Engineering and Techno-Economic Analysis' to deliver high-resolution regional wave, current, and environmental datasets across Southern Alaska's mariculture corridor.
• Ocean RainforestcoreStrategic or Co-development PartnerFull-scale validation experiments measuring tensions on farms while simultaneously measuring waves and currents at exposed sites. Collaboration on first truly offshore farm in the US, working with regulators to provide assurance of proper design.
• ICES Working Group on Open Ocean Aquaculture (WGOOA)coreStrategic or Co-development PartnerActive member working group convened to resolve ambiguity in the term 'Offshore Aquaculture.' Kelson contributed to recommendations for two distinct metrics: Distance from Shore and Exposure Index.
• Open Climate SolutionscoreStrategic or Co-development PartnerPartnership to design and de-risk a multi-trophic seaweed and oyster farm for Loch Melfort, Scotland. Engineered for resilience, the system survived Storm Éowyn's 78-knot winds intact and fully operational.
• TrophiccoreStrategic or Co-development PartnerPartner on full-scale farm validation experiments measuring tensions on farms while simultaneously measuring waves and currents at exposed sites.
• University of New EnglandcoreStrategic or Co-development PartnerARPA-E MARINER Project collaboration for studying kelp as an energy source. Kelson Marine assists with load cell measurements to assess drag on seaweed farms.
• GE, Marquette University, Littoral Power Systems (LPS)coreStrategic or Co-development PartnerDevelopment of novel multi-body wave energy converter (WEC) in partnership where model-predictive control is powered by reinforcement learning algorithm.
• U.S. Department of Energy Water Power Technologies OfficecoreStrategic or Co-development PartnerDOE-funded Open-ocean Wave Energy R&D at PacWave, including multi-body wave energy converter development and research on extreme probability contours.
• ARPA-E (Advanced Research Projects Agency - Energy)coreStrategic or Co-development PartnerMARINER Project funding for developing tools and techniques to accurately predict forces on large structures from waves and currents for seaweed farms. ARPA-E funded validation experiments and open-source solver development.
• Struan Coleman (World Wildlife Foundation)minorStrategic or Co-development PartnerDeveloped detailed techno-economic model for large-scale seaweed farming including permitting costs, monitoring, anchor installation, and financing costs.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• COWI: Large engineering consultancy with deep offshore wind and marine infrastructure practices. Comparable to Kelson's offshore wind and floating-structure design work, but with a far broader portfolio and global footprint.
• Bureau Veritas Marine & Offshore: Major classification and marine verification society offering certification and risk services across shipping, offshore, and ocean industries. Comparable to Kelson's independent certification and due-diligence work at much greater scale.
• Mott MacDonald: International engineering consultancy with offshore wind, coastal, and marine infrastructure practices. Comparable to Kelson's marine infrastructure and renewable-energy engineering scope, but with much broader service breadth.
• DNV: Global classification and certification society with major offshore and renewables practices, including aquaculture standards. A broad incumbent whose independent verification role directly overlaps with Kelson's third-party certification offering.
• AtkinsRéalis: Global engineering services firm with nuclear, offshore, and renewables practices. Adjacent to Kelson in providing technical advisory and engineering for ocean infrastructure projects, including certification-adjacent services.

Direct peers

• Wood Thilsted: UK-headquartered specialist engineering consultancy focused on offshore wind foundation and structural design. Directly comparable to Kelson's floating offshore wind and wave-energy engineering practice, including digital-twin and load-analysis capabilities.
• LOC Group: Global marine warranty survey, engineering, and consultancy firm serving offshore, shipping, and energy clients. Comparable to Kelson in third-party review, certification, and engineering advisory roles for ocean structures.
• 4Subsea: Norwegian offshore engineering and digital-twin specialist serving oil & gas, offshore wind, and ocean industries. Overlaps with Kelson on digital-twin modeling, mooring analysis, and structural integrity services for floating structures.
• Glosten: Seattle-based naval architecture and marine engineering consultancy offering structural design, mooring analysis, and hydrodynamics services for ocean structures. Closely comparable to Kelson in scope of ocean-engineering consulting for blue-economy clients.
• Intermoor: Mooring systems engineering and installation firm (part of Acteon) supporting offshore floating units. Directly comparable to Kelson's mooring analysis and design practice for aquaculture and renewable-energy structures.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/kelson-marine
• Xx.com/KelsonMarine

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds

Investors

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 Kelson Marine