Apollo's PALM Charger - Offshore Charging of Marine Electric Vessels
Proven technology enabling electric vessel charging at sea
Page last modified
November 5 2025
The PALM Charger uses the same proven technology as the PALM QCS to provide safe, offshore charging for marine electric vessels. Mounted on a platform or turbine, it allows vessels to connect quickly and reliably at sea, extending range and reducing emissions. Tested successfully in Orkney with over 30 connect and disconnect operations, the PALM Charger is a step toward a cleaner, more flexible marine future.
In October 2024, Apollo successfully completed trials of the PALM Charger in Orkney, in partnership with local collaborators Leask Marine and the European Marine Energy Centre (EMEC).
The trials focused on proving the technology in real offshore conditions, examining the electrical aspects of power transfer, and refining the marine design. The PALM Charger performed exceptionally, achieving multiple successful connect, power, and disconnect operations under varied sea conditions, with 100% reliability in both mechanical and electrical connections. These results provided valuable insights into marine handling operations, which will inform further development and support final design enhancements.
A commercial prototype will be designed in readiness for a pilot deployment. Offshore Wind will be the first use case, with INTOG, ScotWind and Celtic Sea developments in sight. More generally the system is applicable to any fleet of marine electric vehicles, including those in the fisheries, aquaculture, ferries and leisure sectors.
Pros & Limitations
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Extends operational range. Enables marine electric vessels to recharge offshore, removing the need to return to port.
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Proven offshore performance. Successfully trialled in Orkney with EMEC and Leask Marine, achieving 100% mechanical and electrical reliability.
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Simple and safe to use. Mechanically actuated from the vessel - no divers, ROVs or specialist handling required.
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Minimises vessel modifications. Only a standard winch and cable reel are needed to connect and charge.
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Supports net zero operations. Developed with UK Government funding, helping decarbonise the marine sector and enable fully electric fleets.
Specification
| Title | Description |
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| Core Tech | Energy Storage/Battery |
| Industry | Maritime/Ports |
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Mechanical system
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Passive, vessel-actuated connection requiring only a standard winch and cable reel. No powered subsea components.
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Electrical capacity
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Designed for medium-voltage transfer suitable for charging marine electric vessels; verified in offshore trials for stable power delivery.
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Deployment configuration
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Receptacle mounted on offshore structures (e.g. wind turbines or platforms) with plug housed onboard vessel for repeatable connect/disconnect operations.
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Technology Readiness Level
The Technology Readiness Level (TRL) indicates the maturity level of novel technologies. Learn more about the TRL scale used by us.
[6/9]
Development
Technology demonstration
Mature / Proven
Apollo is a leading engineering and energy consultancy working across the decarbonisation, marine energies, and oil and gas sectors. We provide the industry with transformational advisory, consulting and engineering projects, Technical Placements, and Digital Solutions. We employ over 180 engineers and have offices in Aberdeen, Bristol, Edinburgh, Anglesey, Pembroke and Nottingham.
Country of Headquarters
United Kingdom
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