Danish firm completes world's first offshore wind repowering

Momentum Group has transformed a 20-year offshore wind farm into a slightly newer model. This was not the original plan, says the CEO, but it works, and repowering can also be carried with onshore farms in countries including Denmark, says the CEO.

Photo: Momentum Gruppen

For almost 20 years, Sweden's first offshore wind farm, Bockstigen, consisted of 550 kW turbines from old Danish turbine manufacturer Wind World. But the farm entered a new chapter Friday when five new wind turbines began spinning on site, launching the world's first repowered offshore wind farm.

The farm's total capacity has increased from 2.75 to 3MW, with additions consisting of a handful of nacelles from Vestas' V47 turbine launched in 1997, which yields 600 kw. The farm's retirement age has been postponed by at least 15 years, while annual production from the turbines, the rotors of which have been extended by 10 meters, is expected to be more than doubled from 5 to 11 GWh.

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