Wind Farm Facts

Strong Figures


Wind Turbines






Million kWh/year



Southern German Bight, north of 54º latitude

Distance from the coast

45 km off the island of Borkum

Water depth

25–35 m

Number of wind turbines


Installed power

200 MW

Power generation per year

800 GWh

Full utilisation hours

3,500––4,000 per year

Required space

56 km2

Operation time limit

25 years

Start of construction

Summer 2011 (building decision on 15-12-2010)

Beginning of continuous operation

Autumn 2015




Park Overview

Park Overview

Technical Data

Type of wind turbine (WTG)

Adwen AD5-116 (formerly Areva Wind M5000)

Net power

5 MW

Total height from waterline

148 m

Total height from sea bottom

178 m

Hub height

90 m

Rotor diameter

116 m

Total weight

> 1000 t

Rotor weight

110 t

Nacelle mass

200 t

Foundation structure


Tripod height

45 m

Piles length (Tripod)

35-45 m

Operational Data

Rated power

5 MW

Switch-on wind speed

3.5 m/s (wind force 3)

Nominal wind speed

12.5 m/s (wind force 6)

Shutdown wind speed

25 m/s (wind force 10)


5.9–14.8 rpm

Blade tip speed

90 m/s (324 km/h)

The firm anchorage on the seabed


The tripods anchor the wind turbines firmly to the seabed. The steel structures, which weigh up to 900 t and are up to 50 m high, were “nailed” to the seabed using 30–40 m long steel pipes with a diameter of around 3 m, known as piles. In a process called prepiling, the steel pipes weighing up to 100 t were first placed exactly at the appropriate points on the seabed using a pile-driving template, and each pile was driven into place with up to 3,000 hammer blows. The tripods were then placed on the steel nails with millimetre precision. A total of around 48,000 t of steel were used for the wind farm’s foundation, consisting of 40 tripods and 120 steel nails.

Trianel Wind Farm Borkum

40 Wind Turbines

Trianel Wind Farm Borkum consists of 40 Areva M5000 wind turbines with a total capacity of 200 MW. Each wind turbine has an output of 5,000 kW. The wind turbines with a total height of 148 m from the waterline to the blade tip consist of a nacelle, the rotor star and the tower. Calculated from the seabed, the turbine is just under 178 m high and thus taller than Cologne Cathedral (157 m).

At a height of 90 m above sea level, the nacelle, which weighs around 200 t and covers an area of about 88 sqm, houses the main technical equipment for energy conversion: the gearbox, the rotor bearing and the generator.

The rotor star has a total diameter of 116 m and thus covers an area of about one and a half soccer fields. As the rotor star rotates, the energy of the wind is first converted into mechanical energy and then into electrical energy in the generator. The wind turbines are designed for wind speeds of up to 25 m/s, which corresponds to wind force 10. At full power, the rotors rotate around their own axis around 15 times a minute at a blade tip speed of around 320 km/h.

The "socket" of the wind farm

The Trianel

The wind farm’s internal substation is its “socket”. The substation, which is located 20 m above sea level on two decks, houses two large transformers. These convert the electricity produced from the 33 kV voltage level to the 155 kV voltage required for transmission to the grid. Trianel Wind Farm Borkum shares the substation with its sister wind farm Trianel Wind Farm Borkum II.

The Transport

Grid Connection (TENNET)

The DolWin alpha converter platform with a capacity of 800 MW is the heart of the grid operator TenneT’s offshore grid connection DolWin 1. With a height of 42 m and a footprint of around 2,600 sqm, it has an impressive size. Here, the three-phase current produced at the Trianel Wind Farm Borkum is converted into direct current and then transported onshore via a 75 km long submarine cable. The wind power reaches the Dörpen West converter station via a further 90 km long land route.

The conversion

Converter Station
Dörpen West

At the Dörpen West converter station in Emsland, the direct current from the grid connection in the North Sea is converted back into three-phase current and finally fed into the transmission grid. In this way, the climate-friendly produced electricity reaches the consumers.