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ScottishPower completes world-record subsea cable drilling for East Anglia TWO wind farm

ScottishPower completes world-record subsea cable drilling for East Anglia TWO wind farm

Built World

Two 1.8km ducts bored beneath the Suffolk coast will carry the 960MW wind farm's export cables to shore

Today: ScottishPower completes world-record HDD landfall

Overview

Updated 1 hour ago

ScottishPower Renewables bored two 1.8-kilometer cable tunnels under the Suffolk coast, a length it says is the world's longest continuous single section of extruded polyethylene pipe ever installed. The ducts will let its 960-megawatt East Anglia TWO wind farm's high-voltage export cables reach shore without disturbing the beach above.

The pipes were drilled using horizontal directional drilling (HDD), which tunnels deep below the ground rather than cutting a trench through dunes, shingle, or coastal habitat. Avoiding open-trenching was a key condition for the site, which sits near the Sizewell B nuclear power station and ecologically sensitive nearshore banks.

Why it matters

Record-length drilling lets offshore wind farms connect to shore without trenching through coastlines — cutting environmental harm and the permitting battles that stall projects.

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Key Indicators

1.8 km
Length of each cable duct
Two 800mm-diameter ducts, each just under 1.8km long, buried beneath the Suffolk coast.
960 MW
Wind farm capacity
East Anglia TWO will supply power for roughly one million UK homes.
£4 billion
Project investment
Iberdrola cites approximately €4.7 billion total investment for the wind farm.
1,793 m
Longest pipe Pipelife has made
Each duct was extruded in one continuous length in Norway, eliminating welded joints.
80+
Jobs supported during construction
OCU Group's landfall contract supports more than 80 roles.

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Timeline

1 event Latest: Today
  1. ScottishPower completes world-record HDD landfall

    Today Engineering milestone

    Two 1.8km cable ducts bored beneath the Suffolk coast for the 960MW East Anglia TWO wind farm, the longest continuous PE duct sections ever installed.

Scenarios

1

First export cable installed by fall 2027

Likely Resolves by Q3 2027

Discussed by: ScottishPower Renewables project plans (Ross Ovens)

The company expects the first of the wind farm's high-voltage export cables to be pulled through the new ducts in summer 2027, on the strength of the completed landfall. If the ducts work as designed, the cable pull-in should proceed without further coastal excavation.

2

East Anglia TWO reaches commercial operation by end of 2028

Likely Resolves by End of 2028

Discussed by: ScottishPower Renewables, Iberdrola

The project is targeting commercial operation in late 2028. Hitting that date depends on the remaining offshore construction, turbine installation, and grid connection work proceeding on schedule through 2027 and 2028.

3

Schedule slips — commercial operation pushed into 2029

Possible Resolves by Q2 2029

Discussed by: Offshore wind construction risk analysis

Offshore wind projects routinely face delays from turbine supply chain bottlenecks, offshore installation weather windows, and grid connection timing. If any of these slip, commercial operation could slide past the late-2028 target even with the landfall complete.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

2010s–2020s

Earlier East Anglia HDD landfalls (ScottishPower's first regional wind farms)

ScottishPower Renewables' earlier East Anglia wind farms used the same horizontal directional drilling method at their landfalls, but with ducts roughly one-third the length of the 1.8km sections now installed for East Anglia TWO, according to project officials.

Then

The earlier projects proved HDD could get export cables under the Suffolk coast without disturbing beaches.

Now

They established the landfall template that East Anglia TWO has now scaled up threefold, yielding a world-record single continuous duct length.

Why this matters now

The current record is an escalation of a proven local method, not a brand-new technique — which lowers the technical risk compared with a first-of-kind approach.

Pre-construction

Why HDD replaced trenching at Thorpeness (planning-stage environmental assessment)

ScottishPower's planning documents for the East Anglia TWO landfall detail why HDD was chosen over open trenching: to avoid disturbing the nearshore Sizewell Bank, a Coralline Crag outcrop, and the Thorpeness ness, and to protect the Sizewell B nuclear power station's cooling-water intake from suspended sediment.

Then

The choice of HDD avoided direct physical disruption to coastal features and sediment transport pathways.

Now

The documents show how environmental and infrastructure constraints shaped the engineering — constraints that pushed the project to set length records.

Why this matters now

The record 1.8km duct length is not a stunt; it is the direct result of the site's geology, protected coastal features, and proximity to critical national infrastructure.

Sources

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