A 1,985 ton steel monopile opened the foundation campaign off the Suffolk coast, and the 94 that followed it ranged down to barely two thirds of that weight

A steel cylinder 275 feet long hangs over open water off the Suffolk coast, held by a crane on a vessel standing on legs planted in the seabed.

It weighs 1,985 tons. Nothing about it is floating.

That was April 2025. The last of the 95 was reported in place on 17 August 2026.

A fixed platform has a fixed limit, and reaching that limit took a custom mission equipment spread that was designed, fabricated and installed in under two years.

The one that went first sat at the top of the weight range.

The 94 behind it were not copies.

From 220 feet to 279, position by position

A steel monopile is not a catalogue part. It is sized for the hole it goes into.

Water depth sets how much of it stands in the sea. The soil layers set how far it has to go down before the ground holds it. The rotor above sets the bending load it resists for decades. Wall thickness moves with all three.

Across a site this wide none of those three stay constant. Sand gives way to clay, the water deepens, and the steel changes with it.

So the 95 run from 220 to 279 feet long, at up to 35 feet across, weighing anywhere between 1,323 and 1,985 tons.

Reading them as one repeated part gets the engineering backward. The field varies because the ground underneath it does.

Depth sets the length. Soil sets the rest.

Two years of equipment, before the first lift

A jack up vessel does not float while it works. It drives its legs to the seabed and pushes its own hull clear of the waves.

That stillness is the whole point. A crane on a rolling deck cannot set a 35 foot tube within inches of where it belongs.

The trade is capacity. A fixed platform has a fixed limit, and reaching that limit took a custom mission equipment spread that was designed, fabricated and installed in under two years.

The contractor’s vice president for the region put the moment at two years of preparation, and the record he claimed was carefully worded.

Largest monopile installed from a jack up vessel in Europe. Three qualifiers, each one load bearing.

The one about vessel type is doing the most work, because a floating crane operates to a different set of limits.

Legs take the weight. The hull leaves the water.

Measured to within an inch, not estimated

The first foundation was reported at 275.2 feet tall and 34.8 feet across, a length pinned down to within half an inch.

A figure that precise is a measurement taken after the fact rather than a design target, and that is what separates a record from a forecast.

On top of each pile sits a transition piece, the collar that carries the tower. Each one is 66 feet high, 26 feet across and weighs more than 440 tons.

Fabrication was split between two yards, one building 45 and the other 50, so neither became the bottleneck.

The site area is never published in square miles. The developer gives it as almost 43,000 football pitches, which works out near 118 square miles.

Ninety five piles in the seabed. Ninety five collars on top.

Halfway, sixteen months after the record

Here is the part that gets lost when a foundation field is called a finish line.

When the first pile went down, the published expectation was that all 95 turbines would be standing by early 2026.

By August 2026, with every foundation and every transition piece in place, turbine installation had only just crossed the halfway mark.

Full operation moved to the end of that year. Steel below the waterline generates nothing on its own.

A foundation with no tower on it is a hole in the sea with a tube standing in it.

The vessel that places the machines is its own constraint, as one Virginia project showed with an installation ship.

What gathers around a finished base is a separate question, which 75,000 reef cubes were laid to answer.

Foundations are a milestone. Output is a later date.

Four hundred forty tons sitting on each one

Scale comparisons tend to undersell this. A fully loaded wide body freighter tops out near 500 tons, so one steel monopile of this class weighs roughly four of them.

The turbines above are 95 machines rated at 14.7 megawatts each, which comes to 1,396.5 against a headline figure of 1,400.

Their blades run 377 feet and were built in Hull, and the developer calls them the biggest made and used in the country rather than the biggest anywhere.

This record will not last. Monopiles have been growing for a decade because rotors have, and the next vessel is already being specified somewhere.

The first pile and the record wording are set out by a trade site.

The completed field and the weight range were announced through the developer.

Ninety five holes now hold steel, and what turns that into a power station is the slow work of putting a machine on each.