New connector aims to reduce downtime and enhance safety in floating offshore wind farms

Floating offshore wind is advancing quickly, but one of its practical challenges remains the safe and efficient connection of dynamic power cables in open sea conditions. A new approval milestone for Apollo’s PALM Quick Connection System brings the technology closer to commercial deployment, with the system now progressing toward technical qualification and Type Approval.

The system has received Approval in Principle Level 2 from Bureau Veritas following a 12-month full-scale front-end engineering and design study funded by the Offshore Wind Growth Partnership and Wave Energy Scotland. The assessment means the connector has been independently reviewed against relevant industry standards and can now move to the next stage of qualification for wider use in floating offshore wind projects.

Dynamic cable connection is a critical operation for floating wind turbines. Unlike fixed-bottom offshore wind, floating turbines move with waves, currents and wind, meaning their electrical connections must accommodate continuous motion. Conventional connection and disconnection operations can require specialist vessels, divers, personnel transfer and long weather windows. These factors increase cost, risk and downtime.

The PALM Quick Connection System is designed to simplify this process. It allows dynamic cables to be connected and disconnected without divers or personnel transfer, reducing exposure to hazardous offshore conditions. During offshore field trials, the system reportedly completed 50 successful connection and disconnection operations.

According to Apollo, the system can reconnect dynamic cables in around 5.5 hours, compared with conventional marine operations that can take several days. For a gigawatt-scale floating wind farm, the company estimates potential through-life savings of about $161 million.

The technology was originally developed through a Wave Energy Scotland programme and later adapted for floating offshore wind applications. Earlier trials in Orkney tested the system in real sea conditions, including challenging weather. The connector uses a mechanical locking and guiding system that can complete the connection through the winching action of a conventional vessel, avoiding more complex offshore intervention methods.

The concept can also integrate electrical wet-mate connectors, allowing mechanical and electrical systems to be brought together through a controlled connection process. This is particularly important for floating offshore wind, where efficient maintenance and rapid reconnection can directly affect energy availability and project economics.

Additional subsea electrical trials are planned for 2027 as part of a European research programme led by the European Marine Energy Centre. These trials are expected to provide further data on the system’s performance under operational conditions.

The progress of the PALM QCS highlights a wider shift in offshore renewable engineering. As floating wind moves from pilot projects to commercial arrays, the industry needs technologies that reduce installation risk, shorten maintenance windows and improve offshore safety. Quick connection systems could become an enabling technology for large-scale floating wind farms, especially in deeper waters where conventional offshore methods can become increasingly expensive and weather-sensitive.