ScottishPower Renewables and Masdar's £4bn East Anglia THREE project has begun turbine installation off the Suffolk coast, setting a UK record with 115‑metre blades—each longer than a Premier League football pitch—on its first machine.

All 285 blades for the site's 95 Siemens Gamesa 14MW turbines are being manufactured in the UK at the company's factory in Hull. The turbines stand about 262 metres tall—higher than the Shard's observation deck—and feature a 236‑metre rotor diameter.

Just one full rotation from a single turbine will generate enough electricity to power a UK home for more than four days, charge around 1,700 mobile phones or brew nearly a thousand cups of tea. Once fully operational, the 1.4 GW windfarm will supply clean, homegrown power equivalent to the needs of more than 1.3 million British homes and will rank among the world's largest offshore wind projects.

Charlie Jordan, ScottishPower Renewables CEO said: "This is a defining moment – and a UK industry first – for ScottishPower, Iberdrola and Masdar as we celebrate and accelerate the deployment of homegrown renewable energy at scale.

"East Anglia THREE will be the biggest and most powerful offshore windfarm in our portfolio. That means billions of pounds invested in UK and global supply chains; thousands of jobs supported during construction; more than a hundred long-term roles created in the East of England; and greater energy security, with more clean power coming on to the grid than ever before.

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"This achievement is testament to successful collaboration with our strategic investment partner, Masdar, and the dedication and excellence of our own teams and supply chain partners. East Anglia THREE will play a crucial role in the UK's clean energy future and it's fantastic to see our vision come to life."

Husain Al Meer, Director of Global Offshore Wind at Masdar said: "This is a milestone moment for the UK's offshore wind sector, with the completion of the first turbine for East Anglia THREE representing a truly monumental achievement. We are proud to work alongside ScottishPower and Iberdrola to bring this project to fruition and to be playing our part in securing the UK's clean energy future, while helping to create jobs and drive sustainable growth. We see tremendous potential for offshore wind, not just in the UK but across the wider European market, where offshore wind can provide critical energy security, power economic progress and help nations achieve their clean energy objectives."

The blades are seven metres longer than the previous UK record of 108 metres—also made by Siemens Gamesa—underscoring the step up in scale at East Anglia THREE.

Darren Davidson, UK Head of Siemens Energy and Siemens Gamesa, said: "These are the biggest blades ever built for a project in UK waters – a real landmark for offshore wind. We're proud that these record-breaking blades have been manufactured at our factory in Hull, where we now employ more than 1,400 people, and where we're also investing in the future by training our next generation of workers through a well-established and successful apprenticeship scheme."

Turbine installation began using Cadeler's O‑class Wind Osprey jack‑up vessel. Later this month, the next‑generation P‑class Wind Pace will join the campaign on its first assignment in European waters to keep installation momentum high.

Mikkel Gleerup, Cadeler CEO said: "We are proud to support ScottishPower Renewables and Masdar on East Anglia THREE – our first project together and a strong starting point for future collaboration.

"By deploying two of our vessels in parallel, we can maintain a consistent and efficient installation pace throughout the campaign. This also marks Wind Pace's first project in European waters since her delivery last year. Built to install the next generation of turbines, she brings increased capacity and operational flexibility, enhancing installation efficiency and supporting a more streamlined programme. Together, this strengthens our ability to deliver safely, reliably and at scale"