To repower former wind parks, the existing wind turbines (WT) are removed complete with their foundations, and the area is restored to its natural state. Following this, new hybrid towers – fewer in number, but taller – are built on the restored parcel of land.
K-tower repowering from Salzgitter Mannesmann Renewables is an economically and ecologically advanced repowering option developed together with K-Tower Systems. Some of the round foundations in place are retained and modified so they can be used for the K-towers. In this way, their costly demolition and the construction of new foundations for the hybrid towers are avoided, which substantially speeds up the progress of the repowering project and helps reduce its cost. Our investigations have shown that such "old" foundations can stand up to the loads of the new wind turbines and provide dependable service for years to come.
|Number of turbines||14||6|
|Power output per turbine||1.8 MW||3 MW|
|Hub height||90 m||140 m*|
|Total capacity||25.2 MW||27 MW (>25.2 MW, i.e. capacity increase)|
*Assumption: approx. 1 % capacity increase per meter added to hub height
6 large, circular foundations in former construction pits (red),
6 hybrid towers with 6 turbines
|Land restoration:||Backfill 8 former construction pits, restore the site (green shaded)|
|End of service life:||
Demolish 6 hybrid towers with 6 turbines,
and 6 large, circular foundations
|Land restoration:||Backfill 6 construction pits, restore the site|
Besides the general cost benefits of the K-tower, K-tower repowering yields additional significant savings in time and cost: