Floating solar expands offshore alongside wind farms to ease grid pressure

Developers are increasingly turning to floating photovoltaic technology as land availability diminishes and electrical networks become congested. The strategy involves deploying panels on moored platforms situated at sea, often in close proximity to existing wind turbines or near coastal industrial assets. This approach distinguishes itself from reservoir-based installations currently being explored for lakes and ponds elsewhere.

Proponents argue that positioning solar arrays between turbine foundations allows operators to transmit greater power volumes through the same export cables while smoothing out the intermittent nature of wind generation. Dr Brigitte Vlaswinkel, head of environmental sustainability at Dutch firm Oceans of Energy, noted that their system was designed to endure the harshest conditions found in the North Sea over a period exceeding four years.

The company successfully deployed an initial 50 kW unit approximately seven and a half miles off Den Haag before expanding it to cover an area comparable to a football pitch. Between 2019 and 2023, this array withstood ten storms featuring waves reaching up to 32 feet and hurricane-force winds. The design mimics natural forms, combining the lightness of a water lily with the structural integrity of a human spine. Rigid floats linked by flexible joints enable the structure to move with wave action, allowing forces to dissipate rather than accumulate.

Keeping panels on the surface reduces costs compared to lifting them clear of the water, focusing instead on capturing maximum area for energy generation. Following initial trials, Oceans of Energy installed a 500 kW pilot within the Hollandse Kust Noord offshore wind farm, a joint venture between Shell and Eneco. The firm also collaborated with oil and gas operators facing end-of-life platforms to power daily operations using floating solar instead of diesel generators.

This technology addresses significant land pressures in coastal nations like the Netherlands, where competing demands for housing, recreation, and nature conservation limit space for utility-scale projects. Approximately 12,000 companies reportedly wait for grid connections onshore. Generating power at sea avoids this congestion, with one large offshore field of 200 MW potentially cheaper than multiple smaller land-based plants once infrastructure costs are accounted for.

For countries such as Italy where deep water precludes bottom-fixed turbines, adding solar improves the business case for floating wind by better utilising export cables and complementing production profiles across seasons. The Mediterranean is identified as a primary target market driven by carbon reduction goals and energy independence efforts. Momentum is also building in Southeast Asia, with China rolling out gigawatt-scale parks near shore.

Environmental studies suggest these structures act as artificial reefs, hosting 47 species on their undersides and potentially sheltering seabed areas from trawling activities. Time-lapse imagery indicates that birds and seals frequently rest upon the installations. From a planning perspective, panels floating flat on the water remain invisible from less than a mile offshore, mitigating objections often raised against wind projects.

Other developers are entering the space with varied designs. SolarDuck installed its Merganser pilot using elevated triangular platforms in 2024 and later signed a deal to develop hybrid wave and solar systems. Norwegian contenders include Ocean Sun, which utilises circular flexible film panels, and Moss Maritime, whose modular XolarSurf concept has progressed through sea trials.

While the wider floating market expands rapidly with most capacity currently on inland waters, challenges remain regarding saltwater corrosion and high structural loads from waves and currents. A 2026 study indicated offshore projects could be around 30% more expensive than land-based equivalents despite higher lifetime electricity production. Nevertheless, experts describe this technology as a strategic solution for nations constrained by limited land resources seeking to expand renewable capacity while adhering to environmental limits.