TenneT has stated underground drilling to connect wind farm Hollandse Kust (west Beta).
After contractor NRG’s electric drill arrived at the ‘Een Zee van Staal’ sculpture park work site this week, the first underground directional drilling towards the work site at Tata Steel will start today.
Over the next two weeks, contractor NRG will make the first two (of six) boreholes for the connection of the wind farm Hollandse Kust (west Beta) by TenneT.
Both boreholes have a length of 1,200 metres, according to contractor NRG’s project manager Johannes Becker.
He said: “We start with a so-called pilot borehole with a diameter of 35 centimetres from one working area to the other.
“Then we enlarge that borehole with a ‘reamer’ to a diameter of 95 centimetres. For the third and final step, we pull a strand of four plastic casing tubes into the borehole.”
In the four boreholes, which are made behind the dunes near Velsen towards the transformer station in Wijk aan Zee, four casing tubes are drawn per hole.
These will eventually house the electricity cables.
Of the two sea cables that come ashore via the beach, the three cores (or phases) are split at the work site in the Sculpture Park.
Becker added: “Then each sea cable continues on land as three separate electricity cables and a fibre-optic connection.”