Off IJmuiden in the Dutch North Sea, the 52nd and final turbine went up at Ecowende, and the 760 MW wind farm built around fish and birds stands complete
Fifty three kilometers off the Dutch coast, a jack up vessel lowered its spuds into the seabed one last time this week.
A crane lifted a nacelle the size of a school bus onto a steel tower.
By the time the blades locked onto the hub, the 52nd turbine in a single wind farm was standing in open water.
The project’s final construction phase gives researchers a complete operating site to study rather than a partial one scattered with gaps and half built rows.
The job of building it was finished.
But the count of machines was never the real story here.
So what exactly did the builders agree to leave alone before a single foundation went in?
Why this wind farm was built around what lives beneath it
Offshore construction normally runs on a simple logic: get steel into the seabed as fast as the weather allows, because every vessel day costs money. At Ecowende, the installation contract came with unusual operating limits attached, restricting when and how foundations could be driven so that marine mammals and fish spawning grounds were disturbed as little as possible.
So the piling crews worked inside seasonal windows rather than a straight calendar. Some foundations went in using techniques built to cut underwater noise rather than simply minimize days at sea.
That tradeoff defines the project as much as its turbine count does. The developers also left gaps in the turbine layout and oriented rows to account for bird migration corridors crossing that stretch of the North Sea, rather than packing the array for maximum density.
What 52 machines look like once they are all finally standing
The wind farm sits in the Hollandse Kust West zone, a stretch of seabed chosen years earlier for depth and distance from shipping lanes. The 52nd turbine was installed at the Hollandse Kust West VI site on 30 October, according to Van Oord, which installed the first Vestas V236-15.0 MW turbine on 30 May and used its installation vessel Boreas for the work.
Each unit is a V236 model rated at 15 MW, among the largest turbines operating anywhere in commercial service today. The rotor diameter runs near 775 feet, wider than two football fields laid end to end.
That size matters offshore in a way it rarely does onshore. Bigger rotors catch more wind per foundation, which means fewer steel piles driven into a seabed that regulators were already watching closely for noise and sediment disturbance.
How the final numbers compare with what was promised at the start
The installation campaign took just over five months from first steel to last. The first turbine was installed on 30 May of this year, meaning all 52 turbines were installed in less than five months.
Power started flowing well before the final lift. First power was already generated in July 2026, so the wind farm was already feeding Dutch demand for months while cranes kept working further out at sea.
Once every turbine runs at rated output, the arithmetic becomes concrete. The Ecowende wind farm will have an installed capacity of approximately 760 megawatts, enough to supply around 3 percent of current Dutch electricity demand.
Where the environmental bet still has to prove itself
None of those megawatt figures settle whether building slower and quieter actually paid off for the marine life the restrictions were designed to protect. The real test comes from years of monitoring data gathered after the cranes leave, and that data is only beginning to accumulate now that every foundation is in place.
“With the final turbine in place, the offshore wind park is largely complete, but the real learning begins now,” said Tjalling de Bruin, CEO, Ecowende, describing how the project is designed to gain knowledge on how to build and operate a wind park in harmony with nature.
The project’s final construction phase gives researchers a complete operating site to study rather than a partial one scattered with gaps and half built rows. That is closer in spirit to the ecological bookkeeping now being done at Portugal’s floating wind pilot, where species counts inside a no fishing zone are treated as seriously as output curves. It also lands in a stretch of ocean where engineers are still working out physics questions, the kind addressed by recent modeling into wake recovery behavior downstream of moving turbines.
What standing complete actually changes for the grid and the water around it
For the Dutch grid operator, a complete array is simpler to manage than one still being built in stages, since forecasting output becomes a matter of weather models rather than guessing which turbines are live. That operational clarity is its own quiet payoff.
For the crews who spent the better part of a year chasing weather windows, finishing the 52nd turbine marks the end of one job and the start of another. Maintenance teams now take over, with inspection and servicing stretching ahead for the next quarter century, not unlike the upkeep work underway at a repowered wind project half a world away.
The real measure of whether this slower, more careful build was worth the extra time will not arrive in a press release. It will show up gradually, in fish counts and bird survey data gathered over the coming seasons, the same patient evidence that takes years to accumulate anywhere engineers try to build power generation and habitat protection into one structure.
Hugo is an engineer with strong technical expertise. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.
