Public procurement notice: Modification Of A Contract/Concession During Its Term
Published: 2020-06-26
Buyer: TenneT TSO B.V.
Country: NL
Contract type: Works
CPV classification: 31321300 | 31321500 | 45314300 | 76521000

Technical requirements: In the ‘Energieakkoord’ (September 2013), the Dutch government has stated its intention to develop 3.5 GW of wind energy production capacity offshore in the Netherlands by 2023. The ‘Offshore wind energy Act’ (Wet Windenergie op Zee) of 5 July 2015, introduces a new approach for the development of wind energy in the Dutch North Sea via a structured approach coordinated by the government.
In order to develop the offshore grid according to the time frame of the Energieakkoord, the ‘Offshore wind energy Act’ allows TenneT TSO B.V. (hereafter TenneT) to start preparatory tasks in anticipation of formal designation. The formal designation of TenneT as offshore grid operator in the Dutch Economic Exclusive Zone will be arranged via a revision of the existing electricity act, expected in 2016. In this role TenneT will be responsible for the grid connection of new offshore wind farms via a standardized grid connection system to the existing system onshore, including the design, fabrication, installation, operations and maintenance of the offshore substations and HVAC cable systems.
TenneT's intention is to build five platforms, which will connect two wind farms of 350 MW each. The platforms will be standardized, meaning that the five platforms will be based on the same concept, in order to reduce costs. The platforms will be located approximately 25 km west off the Dutch coast.
The offshore substations are to carry high-voltage switching and transformation equipment as well as auxiliary facilities. Intake power from the wind farms will be 66 kV, export power will be 220 kV.
Each offshore substation is connected to the onshore grid by two three core 220 kV AC Sea Cable circuits and two times three single core 220 kV AC Land Cable.
This tender concerns the designing, engineering, production, delivery and installation of the Sea Cables for the Borssele Alpha project with an option on the Borssele Beta project.
However in case the cable route on any location leads to a limited volume of Land Cable, this Land Cable part may optionally be added to the Sea Cable scope.
In the Energieakkoord (september 2013), the Dutch government has stated its intention to develop 3.5 GW of wind energy production capacity offshore in the Netherlands by 2023. The ‘Offshore wind energy Act’ (Wet Windenergie op Zee) of 5 July 2015, introduces a new approach for the development of wind energy in the Dutch North Sea via a structured approach coordinated by the government.
In order to develop the offshore grid according to the time frame of the Energieakkoord, the ‘Offshore wind energy Act’ allows TenneT TSO B.V. (hereafter TenneT) to start preparatory tasks in anticipation of formal designation. The formal designation of TenneT as offshore grid operator in the Dutch Economic Exclusive Zone will be arranged via a revision of the existing electricity act, expected in 2016. In this role TenneT will be responsible for the grid connection of new offshore wind farms via a standardized grid connection system to the existing system onshore, including the design, fabrication, installation, operations and maintenance of the offshore substations and HVAC cable systems.
TenneT's intention is to build five platforms, which will connect two wind farms of 350 MW each. The platforms will be standardized, meaning that the five platforms will be based on the same concept, in order to reduce costs. The platforms will be located approximately 25 km west off the Dutch coast.
The offshore substations are to carry high-voltage switching and transformation equipment as well as auxiliary facilities. Intake power from the wind farms will be 66 kV, export power will be 220 kV.
Each offshore substation is connected to the onshore grid by two three core 220 kV AC Sea Cable circuits and two times three single core 220 kV AC Land Cable.
This tender concerns the designing, engineering, production, delivery and installation of the sea cables for the Borssele Alpha project with an option on the Borssele Beta project.
However in case the cable route on any location leads to a limited volume of Land Cable, this Land Cable part may optionally be added to the Sea Cable scope.
The VBNK consortium has discovered during the course of the execution of the Borssele Alpha Cable works that a specific part/area of the route (the Northern slope of the Honte) consists of unstable soil, which event has been accepted by TenneT as an Unforeseeable Physical Condition in accordance with Sub-Clause 4.12 of the Conditions of Contract. TenneT has instructed the execution of the direct drilling (DD) under the Contract of Borssele Beta (contract No 2206).


Winner: VBMS B.V.