March 2016

alpha ventus surpassed the mark of 1,5 terawatt hour of generated power

During the operating years from 2011 to 2015, alpha ventus fed an annual average of some 247.45 million kilowatt hours of power into the grid, equivalent to the annual power consumption of approximately 71,000 average households (3,500 kWh) in Germany. 

If the power generated during the commissioning period is added to the five full operating years, alpha ventus has generated by March 2016 1,5 terawatt-hours of electricity since 2009.


A joint project of the utilities EWE, E.ON and Vattenfall

alpha ventus - the first German offshore wind farm

alpha ventus was commissioned as the first German offshore wind farm in April 2010. The construction phase proper was a brief 12 months, a pioneering feat in a location with a water depth of about 30 metres and a distance from the coast of 60 kilometres.

Reflecting its role as offshore test site, alpha ventus operates two types of wind turbines with two different foundation designs. The rated output of the wind farm is 60 MW. Experience gained in construction and operation is an input into the further development and expansion of the German offshore wind power industry.

The alpha ventus offshore wind farm is a joint project of the utilities EWE, E.ON and Vattenfall. These three energy providers established the “Deutsche Offshore-Testfeld und Infrastructur GmbH & Co. KG” (DOTI) operator consortium specifically for this purpose in June 2006. The shares distribution is: EWE 47.5%; E.ON and Vattenfall each 26.25%. The total investment is Euro 250 million with the BMU (German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety) providing Euro 30 million of funds.

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Key data

Number of units 12
Total capacity 60 MW
Energy yield  2011-2015247,45 gigawatt/hours per annum
(= annual energy consumption of about 71,000 households)
Technical data Senvion 5M (Repower)
Rotor diameter 126 m
Height of hub92 m
Total height above seabed185 m
Rated output5 MW
Speed6.9 - 12.1 rpm
Cut-in wind speed3.5 m/s (= force 3)
Rated wind speed13.0 m/s (= force 6)
Cut-out wind speed30 m/s (= force 11)
Weight of nacelle without rotor and hub290 t
Weight of nacelle with rotor and hub410 t
Jacket foundationWeight of steel: 500 t
tower: 210 t
Technical data Adwen AD 5-116 (AREVA Wind resp. Multibrid M5000)
Rotor diameter 116 m
Height of hub 90 m
Total height above seabed 178 m
Rated output 5 MW
Speed 5.9 – 14.8 rpm
Cut-in wind speed 3.5 m/s (= force 3)
Rated wind speed 12.5 m/s (= force 6)
Cut-out wind speed 25 m/s (= force 10)
Blade tip speed 90 m/s (= 300 km/h)
Weight of nacelle without rotor and hub 200 t
Weight of nacelle with rotor and hub 309 t
Weight of steel in tripod, tower, nacelle 1,000 t
Tripod Weight of steel: 700 t; Height: 45 m; Piles: 35 – 45 m
Technical data transformer station
30 m elevation of helipad
25 melevation of main deck with crane, substation control and protection (I&C) / switchgear plant / neutral earthing transformer, fire extinguishing system, MV and LV systems, emergency generating set, MVAr throttle / 110 kV GIS (gas-insulated switchgear) system (AREVA)
21 mcable deck with workshop, equipment room, lounge, diesel tanks, emergency generating unit, cable bench and oil sump
Cable deck and main deck110/30 kV transformator 75 MVA (AREVA)
Jacket foundationapprox. 750 t
Foundation piles35 m long, 2.7 m diameter, 100 t apiece
Position N 54°00', E 6°37.40'

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Supported by the Federal Ministry of Economics and Energy on the basis of a decision of the German Bundestag

RAVE - Research at alpha ventus (extented version)