26 MW Offshore Wind TurbineDongfang Electric—Dongfang Electric's 26 MW offshore wind turbine grid-connected

Dongfang Electric

Offshore wind turbines, 26 MW prototype, China

CNpublicest. 1958dec-ltd.cn (opens dec-ltd.cn)Checked 10 Oct

The brief

Analyst view
  • 26 MW turbine installed August 2025, grid-connected October 2025; world's largest by single-unit capacity and rotor diameter (310m).
  • At 10 m/s mean wind: 100 GWh/year, powering 55,000 homes; avoids 80,000 tonnes CO2 annually.
  • Integrated semi-direct drive, 30,000+ components, dual cooling; withstands 200 km/h winds, salt spray.

Technical approach

As reported
Direct drive

Semi-direct drive gearless system

Fully integrated semi-direct drive combines shaft, gearbox, and generator in one sealed unit. Reduces losses and corrosion.

Cooling

Dual cooling—internal and external

Internal and external cooling systems manage generator and gearbox heat, crucial for hot offshore climates.

Structural

Giant composite blades with 153m length

Each blade: 153m, ~90 tonnes. Advanced composites enable extreme length without excess weight.

Corrosion

Fully sealed against salt spray

Entire turbine sealed to prevent seawater corrosion; critical for 20+ year offshore service life.

Primer