Energinet.dk has invited potential contractors to prequalify for an unexploded ordnance (UXO) survey to be carried out in 2015 at the Horns Rev 3 offshore wind farm site.
The Danish transmission system operator (TSO) Energinet.dk is preparing the installation of a 33 km export cable from the planned offshore wind farm Horns Rev 3. The cable extends from the planned transformer station to the west coast of Jutland, Denmark.
The cable route traverses areas with varying risk of encountering UXO and it has thus been decided that a multi-purpose UXO survey shall be performed to meticulously investigate the installation corridor and quantify the UXO risk.
With respect to survey methodologies, the installation corridor can be divided into the following zones:
1. Offshore section with a sporadic risk of encountering British air-delivered sea mines, jettisoned aerial bombs, anchored sea mines that have lost the anchor and sunk, UXO from a target practice area.
2. Offshore section with the same risk as above plus the risk of encountering German aluminum ground mines presumed to be laid in a mine field crossed by the installation corridor.
3. Near shore section extending across a zone extending 1 nm from the coast where there is an elevated risk of encountering anti-invasion mines.
Offshore WIND Staff; Image: Energinet.dk