Stillstrom by Maersk has completed construction and factory acceptance testing of what it describes as the world’s first 11 kV vessel-mounted connection unit, a system intended to charge service operation vessels directly from offshore wind farms, MarineLink reported on 3 November 2026.
The unit is designed as a vessel-mounted connection point capable of receiving electrical power at an 11 kV rating so that service operation vessels, commonly known as SOVs, can be energised while alongside a wind farm’s export or array infrastructure.
Service operation vessels perform crew transfer, on-site maintenance and logistical support for offshore wind farms; the capacity to take electrical power directly from a farm while at sea would change how those vessels replenish energy between tasks but the exact operational model for the Stillstrom unit was not detailed in the summary provided.
An 11 kV vessel-mounted connection represents a higher-voltage approach than standard low-voltage shore-power arrangements and is intended to match the distribution levels used in offshore wind export systems; the report identifies the unit by its voltage rating but does not specify further technical parameters or certification status beyond factory acceptance testing.
MarineLink’s item records completion of construction and factory acceptance testing but offers no additional timeline for trials, at-sea integration or commercial deployment in the supplied notes. Further steps customary to marine electrical systems, such as sea trials and site integration, were not described in the material provided for verification.
Factory acceptance testing and what it signifies
Factory acceptance testing confirms that a device meets agreed specifications before it leaves the manufacturer’s facilities; in this instance Stillstrom by Maersk reported that testing had been completed for the 11 kV connection unit, marking a manufacturing milestone ahead of any subsequent field evaluation.
The report does not include test results, safety certificates or statements about independent verification, so the completion of testing should be read strictly as an internal milestone announced by the developer rather than external proof of operational performance at sea.
Potential operational implications
If adopted at scale, vessel-mounted high-voltage connection units could enable SOVs to obtain electrical power without returning to port or relying solely on onboard generation, which would affect scheduling, vessel design and the logistics of crew transfer and maintenance operations; those outcomes are logical possibilities rather than confirmed results from the present announcement.
Direct on-site charging would interact with wind farm infrastructure and operator procedures, requiring compatible interfaces, safe connection practices and clear operational protocols, none of which are described in the summarised report but would be necessary for practical use of an 11 kV vessel-mounted system.
MarineLink’s report, dated 3 November 2026, identifies the scheme under the Stillstrom by Maersk banner and highlights the completion of construction and factory acceptance testing for what the company calls the world’s first 11 kV vessel-mounted connection unit for SOV charging. The supplied notes do not provide further deployment details or technical documentation.