Inch Cape enters the turbine phase: what the start of V236-15.0 MW installation says about the UK's largest-to-date offshore build

The arrival of Cadeler's jack-up Wind Mover at the Inch Cape site on 30 October marks the point at which the 1,080 MW Scottish project moves from foundations to machines. As milestones go it is unremarkable in itself — turbine installation begins on schedule, roughly at the point the project owner had signalled ("November"). What is more instructive is how Inch Cape is being built: a hybrid foundation design, a pre-assembly pipeline running out of Dundee, and a commissioning campaign that stretches to September 2027, implying first power will be a trickle before it becomes a flow.

Status check: what is actually done

A note of caution on the foundations. Trade reporting describes jacket installation as "underway"; the project's own construction page, as of the material reviewed, still frames the jackets as preparing to leave Leith, with pin-pile installation the active offshore task. The reconciliation is straightforward — the jacket positions are being prepared and jackets are beginning to sail — but readers should not infer that 18 jackets are in the seabed. That is an open item.

The hybrid foundation design is the interesting engineering

Most UK projects of this vintage are all-monopile. Inch Cape's 54 monopile / 18 jacket split is unusual and reflects ground conditions across the site rather than supply chain convenience: jackets on pin piles suit locations where driven monopiles are less suitable, or where metocean and geotechnical conditions favour a four-legged, piled structure.

The practical consequences for the build are real:

• Two foundation campaigns, two vessel spreads. Seaway7 has carried both the monopile TPs and the jackets, plus the pin piles — an integrated scope that reduces handover risk but concentrates schedule exposure in one contractor.
• A second steel supply chain. Jackets come from COOEC Fluor Heavy Industries; monopiles and TPs from CWHI and Dajin. That diversification is a hedge, but it also means two fabrication quality regimes and two logistics streams converging on Leith and Cromarty Firth.
• Turbine installation must respect both. Wind Mover can only install where a foundation is complete. With jackets still being worked, the early turbine campaign will almost certainly run on the monopile positions first, with jacket-mounted machines later in the sequence. That is an inference, not a published schedule.

Dundee and the batch-of-four model

Inch Cape is the first UK project to deploy the V236-15.0 MW — the largest turbine installed in UK waters to date. The logistics are correspondingly heavy: 288 tower sections, 216 blades and 72 nacelles, 576 components in total, pre-assembled at Forth Ports' Dundee yard (170,000 m², over 130 personnel) and shipped offshore in batches of four. The tallest assembled tower section is 127.4 m.

For the steel and fabrication supply chain, the relevant point is that turbine scale drives tower steel mass and monopile/TP dimensions simultaneously. The V236's rotor and hub loads push transition-piece and foundation specifications upward; the ~700 t, 8.3 m diameter TPs at Inch Cape are a tangible expression of that. As the UK pipeline moves toward even larger machines in the Celtic Sea and beyond, the fabrication bottleneck will be less about tonnage than about yard capability for these diameters and handling weights.

Commissioning to September 2027: the schedule tells a story

The single most informative number in the announcement is the end date: installation and commissioning run until September 2027. First power is targeted for late 2026, full commercial operation in 2027.

That gap — first power in late 2026, commissioning complete nine months later — is normal for a project of this size but worth reading carefully. A 72-turbine array cannot be energised in one step; the export system, array cables and offshore substation must be proven, and turbines are progressively released to the grid as they are commissioned. The commercial operations date will follow the last machine, not the first.

The commissioning spread is also notable: an SOV (Acta Hercules) plus two CTVs for a 72-turbine array implies sustained technician presence over many months, not a short sharp campaign. Acta Marine's involvement is consistent with a Vestas-led commissioning scope; the specific vessel assignments come from trade reporting and are not corroborated in the owner's own releases reviewed here.

What to watch

• Jacket completion. Until the 18 jackets are confirmed installed, the turbine sequence and the COD are exposed to a single remaining foundation variable.
• Weather windows in the North Sea through winter. Turbine installation into a Scottish winter is slow work; the batch-of-four model is designed for it, but the September 2027 end date already embeds contingency.
• First power timing. A late-2026 first-power target with installation only now beginning is tight. Slippage of a few weeks would not change the COD but would change the narrative.
• Supply chain read-across. Inch Cape is an early reference for the V236 at scale in UK waters; its installation productivity will inform assumptions for larger UK and European pipelines.

Inch Cape's significance is less that turbines have started going in than that the project is now testing, in real conditions, the combination of a 15 MW turbine, a split foundation design and a port-based pre-assembly model. How that combination performs over the next eleven months is the signal worth tracking.