ENGIE Solutions and Iemants Sign Hollandse Kust West Alpha Contract

ENGIE Solutions and Iemants Sign Hollandse Kust West Alpha Contract

TenneT and a joint venture of ENGIE Solutions and Iemants have signed a contract to design, engineer, produce, deliver, transport, and install the Hollandse Kust West Alpha offshore transformer substation.


Earlier this year, the consortium had won the contract for the construction and installation of the Hollandse Kust North offshore transformer substation, with options for identical work on the Hollandse Kust West Alpha and Hollandse Kust West Beta offshore substations.

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The transformer substation for Hollandse Kust West Alpha is scheduled to be commissioned in 2024.

The contract includes the engineering, procurement, construction, offshore installation, connection, and testing of the offshore transformer substation.

The topside and the jacket will be built separately on land and installed at sea on site using a crane ship.

The Hollandse Kust North, West Alpha, and West Beta will be located in the North Sea along the Dutch coast.

These three 700 MW platforms will be the fifth, sixth, and seventh large-scale grid connections for offshore wind energy in the Netherlands that will be built and operated by TenneT.

The first high-voltage connections for the wind farms near Borssele will be operational in 2020, followed by the connections for Hollandse Kust Zuid in 2022. TenneT will have realised approximately 9.6 GW of high-voltage connections in the Dutch North Sea by 2030.

“The current collaboration with the ENGIE Solutions/Iemants consortium for the realization of the transformer substation for the Hollandse Kust (north) gives us confidence in the joint work for the next transformer substation; Hollandse Kust (west Alpha). By signing this contract, TenneT continues its strategy for cost-effective, standard offshore transformer substations to drive the Dutch energy transition,” Marco Kuijpers, TenneT’s Offshore Director, said.

The Hollandse Kust West Alpha substation will be built according to TenneT’s standard design.

The substation’s jacket is 49 metres tall and consists of 1,930 tons of steel. This steel structure will be anchored in the seabed with piles at a depth of 28 metres.

On top of this, the topside will have three inner floors and an outer deck. The topside weighs approximately 4,300 tons and is 47 metres long, 35 metres wide and 25 metres tall.