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Concrete Towers for Wind Turbines at Nees

Photo: COWI

​The Nees project comprises 3 nos. 90 m tall concrete towers supporting 3.6 MW Siemens Wind Power turbines with 120 m dia. rotors.

​The Nees project is situated about 15 km inshore the west coast of Jutland (Denmark) 20 km south of Lemvig. It comprises 3 nos. 90 m tall concrete towers supporting 3.6 MW Siemens Wind Power turbines with 120 m dia. rotors.

The Nees towers are constructed by slip forming which allow for varying wall thickness as well as varying tower diameter. Strict requirements to the eigenfrequency of the tower and high oscillating forces are the governing design parameters. The design has been verified by the COWI in-house FE modelling software IBDAS, and all calculations have been certified by a third party certifying body.

Concrete towers have been built in Denmark since the 1940’s but have
been displaced by more cost efficient steel towers since. Increasing demands for taller inland wind turbines now require alternative solutions to steel towers which diameter is limited by the available clearance under bridges which have to be passed when transporting tower parts to the site. The Nees project is designed to reveal the technical performance of concrete towers with 90 m hub heights.

LAST UPDATED: 16.01.2017