In short: Britain's offshore wind fleet already generates around a third of the country's electricity and is on track to roughly triple in capacity before the end of the decade. Every turbine, every vessel, and every inspection drone in that fleet needs a network to talk to — and the industry has quietly reached the point where sticking with bolted-on satellite links is no longer good enough. Private cellular is starting to become the connective tissue of the North Sea.
Key Takeaways
- The offshore wind fleet is sensor-dense, not just power-dense — a single modern turbine carries hundreds of condition-monitoring points, and a multi-gigawatt array like Dogger Bank or Hornsea runs into the millions
- Inspection is the workload that breaks old networking assumptions — drone-based blade inspection, rope-access video support, and crew-transfer vessel operations all need high-bitrate, low-latency links that satellite alone can't economically deliver
- Private networks at the array and at the onshore substation change the unit economics — running a managed cellular layer across an offshore field and its landfall points is now cheaper over the operating life than the patchwork of satellite, LTE dongles, and radio-bearer workarounds it replaces
In a nutshell
A Different Kind of Energy Asset
When people think of connectivity in the offshore energy sector they still think of rigs — floor after floor of process instrumentation, a huge downlink for seismic data, a hostile environment that needs everything in a Zone 1 enclosure. Offshore wind is not that world. A turbine is not a rig.
A modern 15 MW wind turbine is closer to an enormously elongated electric motor bolted to a mast, with a couple of hundred sensors monitoring bearing temperature, blade pitch, tower sway, strain gauges, oil particulate counts, ambient wind conditions, and grid-side electrical quality. The turbine itself sits on a steel monopile driven tens of metres into the seabed, alone in the middle of a wind field that may extend across a hundred square kilometres. The control cable feeding each turbine is electrical and fibre-optic, terminating at an offshore substation that hands off to a subsea export cable.
Multiply that by the 190-plus turbines in Hornsea 2, the 277 planned in Dogger Bank across phases A, B, and C, or the hundreds more committed across East Anglia One, Seagreen, Neart na Gaoithe, and Moray West. Add the floating turbines at Kincardine and Hywind Scotland, where the hull itself is moving and the connectivity problem gets harder. Britain is not operating a handful of experimental wind farms any more — it is running a continent-scale sensor network on the surface of the North Sea.
The Jobs That Keep Needing More Bandwidth
The thing about this fleet is that the amount of data each turbine wants to send up to the operator keeps rising — not because the turbines are any chattier about their own state, but because the value of every extra byte of inspection, acoustic, vibration, and video data keeps going up.
Blade Inspection By Drone
Every operator of a gigawatt-scale wind farm is moving blade inspection onto drones. The economics are obvious: a rope-access inspection team costs a small fortune per blade and stops the turbine while they work; a drone can image the same blade in minutes, at higher resolution, without dangling a human. The drone records 4K video, thermal imagery, and sometimes LiDAR. On a good day it flies ten blades before lunch.
The data that comes off those drones doesn't just need to be stored — it needs to get from the foundation platform back to shore the same day, so that the ML-based defect classifier can flag leading-edge erosion, lightning damage, or bond-line failures overnight and schedule any follow-up work for the next weather window. Satellite can do the upload, but on a big campaign the cost and the latency quickly stack up.
A private cellular layer covering the array, with backhaul from the offshore substation, handles this workload without flinching. The inspection team dumps the day's imagery to a local edge server on the substation as soon as the CTV docks, and the onshore team sees it by the time they finish their crossword.
Crew Transfer Vessels and Service Operation Vessels
CTVs shuttle technicians out to the turbines every weather-eligible day. The modern SOV fleet is even more connected: these vessels are effectively floating hotels and workshops, with 40–60 technicians, a helideck, spare parts storage, and a motion-compensated gangway. On board, every technician wants Wi-Fi, every job card wants to sync, every safety system wants to report, and the captain wants continuous position and weather telemetry.
Running all of that over a single satellite link is expensive and rate-limited. Running it over 4G from shore stops working a few miles out. A private cellular network that spans the wind field gives the vessel continuous high-bandwidth coverage from the moment it reaches the array until the moment it leaves. Technicians can pull down technical manuals and manufacturer specs at the transition piece; safety systems can push telemetry continuously; motion-compensated gangway sensors can log their own performance without ever disconnecting.
Turbine Condition Monitoring At Finer Cadence
Condition-monitoring systems on wind turbines have historically been relatively low bandwidth: a hundred channels sampled a few times a second, summarised, and uploaded periodically. That's changing. Higher-rate vibration capture for gearbox and bearing analysis, acoustic emission monitoring, and continuous strain sampling on the tower are all being rolled out by the major OEMs. Each of those individually is still modest — but multiplied across hundreds of turbines, and sampled continuously instead of on a schedule, the aggregate traffic grows by an order of magnitude.
This is a workload that satellite backhaul is bad at and continuous cellular is good at.
Floating Wind Moves The Problem
Everything above is a bit harder on floating wind. A Kincardine-class semi-submersible or a Hywind spar-buoy is not in the same place from one minute to the next. Mooring lines sway, the hull heaves, the electrical umbilical twists. Satellite backhaul on a moving hull is tractable. A fixed microwave link to shore isn't. A cellular network that can cope with a moving client that stays inside the same cell indefinitely is, almost by accident, the right shape for the problem.
The UK's floating wind ambitions — Celtic Sea Round 5, ScotWind's deepwater lots — mean this stops being a niche problem relatively quickly. Connectivity planning for those projects needs to start at the concept stage, not retrofit in commissioning year.
Why This Isn't Just "Put Up An LTE Dongle"
The tempting shortcut is to bolt a commercial 4G router onto the transition piece of every turbine and call it a day. Several operators have tried. It half-works. The range of a public macro cell from shore varies wildly with weather and sea state. Large arrays sit well outside reliable public coverage. The operator of the public network has no interest in how your turbine behaves during a storm. There is no separation between your SCADA traffic and somebody's phone call on the beach. And when a major weather event takes the public network offline, your blade inspection campaign goes with it.
A private cellular network flips each of those assumptions. The operator is you, or a managed partner. The coverage is designed for the array. The backhaul is explicit, not a service-of-service. The service levels are yours to set. And critically, the spectrum is available — Ofcom's Shared Access Licence framework includes bands that work acceptably over saltwater paths, and the UK has specifically flagged the offshore wind sector as a target use case for its spectrum liberalisation.
Where UK Projects Are Heading
The major UK offshore wind operators — SSE Renewables, Ørsted, Equinor, RWE, Vattenfall, ScottishPower — each run internal programmes on digitalisation that end up needing this layer. Dogger Bank's onshore control facility at Trimdon Grange is designed around a high-throughput data pipeline from the array. Hornsea's operations and maintenance base at Grimsby services one of the densest clusters of turbines in the world. The Net Zero Technology Centre in Aberdeen and the Offshore Renewable Energy Catapult in Blyth both run testbed work where advanced wireless connectivity is part of the experiment, not an afterthought.
None of these operators is going to put up a press release about the wireless layer. They will put out press releases about uptime, about capacity factor, and about the cost of energy. Every one of those metrics gets quietly better when the network underneath stops being the bottleneck.
Beyond The Majors
The analog to watch is what is happening to smaller developers of wind-to-hydrogen projects, hybrid floating platforms, and community-scale tidal and wave schemes around the UK coast. These operations have the same connectivity problem as the gigawatt-scale majors but without the bespoke-deployment budget. A managed private cellular network sized for a single jetty, a single substation, and the nearby marine licence area is exactly the sort of thing the Shared Access framework was designed to enable.
The North Sea is going to carry a lot more power in the next ten years than it does today. The wireless layer underneath is the quiet infrastructure that decides whether that power is cheap.
If you're planning the operations side of an offshore wind asset — fixed or floating, gigawatt-scale or pilot — and connectivity is the bit nobody owns, get in touch. Read more on our oil, gas and energy sector page.