Stillstrom

What Stillstrom does

Stillstrom, a wholly-owned business venture of A.P. Moller - Maersk founded in 2019 and incorporated as an independent company in 2022, designs and supplies offshore power and charging infrastructure that enables hybrid and electric vessels to connect to low-emissions electricity while at sea or at anchor. The company is headquartered in Copenhagen with a dedicated UK entity in Aberdeen and employs more than 30 people. Its product portfolio is split into two solution lines: Offshore Wind Infield Charging (comprising the Hang Off System for wind turbine generators, the Hang Off System for offshore substations, the Hang Off System for monopile structures, and a floating Offshore Charging Buoy connected via dynamic subsea cable) and Offshore Power Zones (designated anchorage areas with centralized charging hubs for idling vessels near ports and canals). Stillstrom's technology integrates directly with existing wind farm infrastructure and is engineered for harsh offshore conditions, including 100-year storm return specifications.

The company is driving the development of IEC/IEEE 80005-5, the first international standard for High Voltage Offshore Connections, and has secured approval of its carbon-credit methodologies from both Gold Standard and Verra, embedding its technology into voluntary carbon markets. The company monetizes through three revenue streams: hardware sales of offshore charging infrastructure deployed at wind farms and anchorages, technology licensing and integration services for wind farm structures and vessel systems, and professional services including feasibility assessments, system design, and operational simulations. Pricing is undisclosed and the go-to-market is enterprise field sales targeting offshore wind developers, vessel owners/operators, and port operators across Northern Europe.

Key commercial indicators include MoUs and co-development partnerships with Ørsted, ScottishPower Renewables, North Star, Bibby Marine, Port of Aberdeen, Port of Skagen, Port of Roenne, and the Panama Canal Authority; technology and engineering partners Semco Maritime, MacArtney, Prysmian, and Maersk Training; a €5M EU Horizon Europe grant for the three-year SPARK pilot in Skagen, Denmark; a Q4 2026 first demonstration trial with Faber Group and Prysmian in Esbjerg; and a 2026 Scottish Green Energy Supply Chain Awards Technology and Business Innovation Award. The company is not yet at commercial revenue scale, with activity in 2026 centered on pilot deployment, standards finalization, and ecosystem buildout.

Name

Stillstrom

Legal name

A.P. Moller - Maersk (operating as Stillstrom)

Website

https://stillstrom.com

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

11–50 employees

Short description

Stillstrom, a Maersk-owned Danish company, designs offshore power and charging infrastructure (Hang Off Systems and Charging Buoys for wind farms, plus Offshore Power Zones at anchorages) that enables hybrid and electric vessels to connect to low-emissions electricity while at sea. It serves offshore wind developers, vessel operators, and ports primarily across Northern Europe.

Ownership category

akta.pro rank

Product category

Offshore Marine Charging Infrastructure

akta.pro primary industry

Shore Power & Electrification Systems (Cold Ironing, Charging Interfaces) (IMAJAJAM)

akta.pro secondary industry

Offshore Wind Substructures & Marine Engineering (Monopiles, Jackets, Floating) (EUAMACAE)

Keywords

• Offshore vessel charging
• Maritime electrification
• Offshore wind charging
• Shore power solutions
• Marine decarbonization

Headquarters

HQ city

Copenhagen

HQ country

Denmark

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D, Supply Chain, Personnel, Marketing or Sales, Operations

Revenue model

1. Offshore Charging Infrastructure: Providing offshore power and charging solutions to wind farm developers, vessel owners, and port operators. Revenue derived from system deployment, integration, and ongoing support services.
2. Technology Licensing and Integration Services: Licensing of proprietary offshore charging technology and integration services for wind farm structures and vessel systems.
3. Professional Services: Consultancy services including technical feasibility assessments, system design, and operational simulations for customers considering offshore electrification.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Stillstrom develops and deploys offshore power and charging solutions that enable hybrid and electric vessels to connect to low-emissions electricity while at sea, at anchor, or while supporting offshore wind farm operations. Its product portfolio includes proprietary Hang Off Systems integrated with wind turbines, offshore substations, and monopile structures, a floating Offshore Charging Buoy connected via dynamic subsea cables, and Offshore Power Zones — designated anchorage areas equipped with charging stations that allow idling vessels to plug into onshore grid or renewable power instead of burning fuel.

Product overview

Stillstrom offers offshore power and charging solutions organized into two main product areas: Offshore Wind solutions (Hang Off Systems for WTG, OSS, and Monopile structures plus an Offshore Charging Buoy) enabling vessels supporting wind farm operations to connect and charge; and Offshore Power Zones for vessels idling at anchorages or waiting areas near ports, providing multiple charging points connected through a centralized hub for direct electrification while anchored.

Differentiator

Problem solved

Functional benefit

Products and services

• Hang Off System WTG (Wind Turbine Generator) A charging point fixed on a wind turbine platform that enables Service Operation Vessels (SOVs) to securely connect and receive power for safe and stable power transfer during wind farm operations and maintenance.
• Hang Off System OSS (Offshore Substation Platform) A charging solution fixed on offshore substation platforms providing reliable power supply to connected Service Operation Vessels serving offshore wind farms.
• Hang Off System Monopile A modularized hang off system integrated with monopile structures housing electrical equipment necessary for transformation and conversion of power for vessel charging.
• Offshore Charging Buoy A floating offshore charging structure anchored to the seabed and connected via dynamic subsea cable to offshore substations or wind turbines, enabling clean energy transfer for hybrid and electric vessels at sea with options for mooring and weathervaning, designed for 100-year storm return conditions.
• Offshore Power Zones Designated areas in anchorage locations, near landfall or ports, where vessels can anchor and connect to sustainable power solutions instead of running engines while idle. Equipped with multiple charging points connected through a centralized hub, drawing from onshore grid or renewable sources, reducing emissions and environmental impact from idling vessels.

Quantifiable outcome

• Up to 70% cost reduction when hybrid electric vessels are paired with offshore charging infrastructure vs conventional marine fuel vessels
• +4 more outcomes

Named customers7 records

Segments4 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

15 partnerships are on record, tiered core and major.

• ØrstedcoreStrategic or Co-development Partner · 1 January 2020Leading offshore wind developer and operator. Stillstrom and Ørsted collaborated on offshore charging between 2020 and 2023, working together to advance maritime electrification in offshore wind operations.
• ScottishPower RenewablescoreStrategic or Co-development PartnerBusiness owned by Iberdrola and leader in offshore wind energy sector. Stillstrom is working with ScottishPower to advance offshore charging in the offshore wind industry.
• North StarcoreStrategic or Co-development PartnerLeading SOV provider for offshore renewable industries. Stillstrom offshore charging systems are technically compatible with North Star vessels, enabling their hybrid and electric vessel operations.
• Bibby MarinecoreStrategic or Co-development PartnerPioneer SOV provider building the first eSOV in Europe and UK. Bibby and Stillstrom are collaborating closely; Stillstrom offshore charging systems are technically compatible with Bibby e-SOV vessels.
• MacArtneycoreTechnology or IntegrationLeader in developing underwater technology and cable/connectivity solutions for offshore wind. Key industry partner for Stillstrom in developing offshore charging solutions.
• Semco MaritimemajorTechnology or IntegrationInternational engineering and contracting company with over 40 years in energy and offshore wind sectors. Working closely with Stillstrom on FEED design and integration of charging solutions on offshore installations.
• Port of AberdeenmajorStrategic or Co-development PartnerLeading port for offshore energy to the North Sea region. Port of Aberdeen and Stillstrom are close partners, having conducted an early feasibility study for an Offshore Power Zone outside Aberdeen.
• Port of SkagenmajorStrategic or Co-development PartnerForward-thinking port with the busiest anchorage in the Nordic region. Stillstrom and Port of Skagen signed an MoU for investigating the potential for Offshore Power Zone development in connection with shore power expansion.
• Gold StandardmajorOthersSets the standard for climate and sustainable development interventions to quantify, certify, and maximise impact in voluntary carbon markets. Gold Standard has approved a methodology for offshore charging.
• VerramajorOthersNon-profit organization that develops and manages standards for sustainable development, climate action, and responsible business practices. Verra has approved the methodology for offshore charging as a clean carbon reducing technology.
• International Electrotechnical Commission (IEC)coreStrategic or Co-development PartnerGlobal non-profit membership organization bringing together over 170 countries on electrotechnical standards. Stillstrom is actively supporting and participating in developing standards for shore power transferable to offshore power.
• Baltic Energy IslandcoreStrategic or Co-development PartnerInternational partnership focused on developing solutions for offshore energy hubs using Bornholm Energy Islands as a blueprint. Collaborating with Port of Rønne and Stillstrom on showcasing how Bornholm's offshore wind farms can directly support maritime electrification.
• Port of RoennecoreStrategic or Co-development PartnerLargest commercial port on Bornholm island and central maritime hub in the Baltic Sea. Partnered with Stillstrom and Baltic Energy Island on the Bornholm Energy Island whitepaper, studying how offshore wind can power maritime electrification.
• Faber GroupmajorStrategic or Co-development PartnerPartner in offshore charging pilot project for service operation vessels in the offshore wind sector. First demonstration trial scheduled for Q4 2026 in Esbjerg, Denmark.
• PrysmianmajorTechnology or IntegrationPartner in offshore charging pilot project developing charging solution for service operation vessels. Providing cable and connectivity solutions for the demonstration trial in Esbjerg.

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Emerging players

• Corvus Energy: Marine battery storage systems provider for hybrid and fully electric vessels, including SOVs and offshore wind support vessels. Comparable to Stillstrom in serving maritime decarbonization, complementary as the battery side rather than the offshore charging infrastructure side.
• Echandia: Supplies heavy-duty lithium-ion battery systems for maritime electrification, including SOVs, hybrid vessels, and offshore service fleets. Operates adjacent to Stillstrom by powering the vessels that Stillstrom's offshore charging infrastructure would serve.
• Shift Clean Energy: Provider of marine energy storage and battery-hybrid systems for offshore wind SOVs and commercial vessels. Complementary/competing to Stillstrom depending on whether the binding constraint is vessel-side energy storage or the offshore charging source.
• Volvo Penta: Marine propulsion and onboard power provider with new marine charging and hybrid/electric drivetrain offerings. Increasingly relevant peer as Volvo Penta extends its portfolio from onboard power and propulsion into vessel charging interfaces that compete with Stillstrom's use cases.
• Leclanché: Manufacturer of marine lithium-ion battery systems for commercial vessels, ferries, and offshore service operations. Adjacent peer that addresses the same fleet electrification pain points as Stillstrom, focused on the vessel-side of the ecosystem.

Broad incumbents

• Wärtsilä: Marine technology major offering vessel electrification solutions including shore power, hybrid marine systems, and integrated ship-to-shore solutions. Overlaps with Stillstrom's marine electrification and shore-power extension value proposition as part of a much broader portfolio.
• ABB Marine: Supplies shore-to-ship power solutions, Onboard DC Grid, and marine electrical systems to vessel operators and ports. Competes with Stillstrom in marine charging infrastructure while also serving adjacent ship electrification needs across a global installed base.

Direct peers

• Stemmann-Technik: Specialist in port power, shore connection systems, and high-voltage cable management for ship-to-shore power (formerly PowerCon). Directly competes with Stillstrom's cold-ironing and high-voltage shore-power extension offerings, particularly in European ports.
• Nidec Industrial Solutions: Power-conversion specialist with shore power and high-voltage electrification systems for ports and vessels. Competes with Stillstrom on the high-voltage power infrastructure component that underlies both offshore hang-off and onshore shore-power offerings.
• Cavotec: Global provider of shore-to-ship power connection systems and ports/marine electrification equipment. Directly competes with Stillstrom's core cold-ironing and shore-power extension technology, serving the same vessel owners and ports worldwide.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/stillstrom

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries1 record

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 Stillstrom