Marine Survey Framework

Overview

Lots (9)

• Lot 1 - Geophysical

  Non-intrusive surveys generally for route development along a corridor of seabed, including the collection, processing, reporting and delivery of bathymetric data; seabed classification and detection of objects with dimensions of 0.25m and larger; identification and characterisation of the sub-sea floor to around 25m depth; sub-surface measurements at landfall and detection of larger scale anthropomorphic magnetic anomalies such as pipelines and wrecks. This lot may also be used for maintenance where deemed necessary due to the scale or technical requirements. Collection methods are not limited to but currently utilise Single and Multi-beam Echo Sounders, Side Scan Sonars, Sub-Bottom Profilers, seismic refraction equipment and Magnetometers. ROV work utilising equipment mentioned above, video and pipe trackers may also be required where existing assets are being crossed or where maintenance work requires larger assets to be deployed. Additional information: Non-intrusive surveys generally for route development along a corridor of seabed, including the collection, processing, reporting and delivery of bathymetric data; seabed classification and detection of objects with dimensions of 0.25m and larger; identification and characterisation of the sub-sea floor to around 25m depth; sub-surface measurements at landfall and detection of larger scale anthropomorphic magnetic anomalies such as pipelines and wrecks. This lot may also be used for maintenance where deemed necessary due to the scale or technical requirements. Collection methods are not limited to but currently utilise Single and Multi-beam Echo Sounders, Side Scan Sonars, Sub-Bottom Profilers, seismic refraction equipment and Magnetometers. ROV work utilising equipment mentioned above, video and pipe trackers may also be required where existing assets are being crossed or where maintenance work requires larger assets to be deployed.

  £30,000,000

• Lot 2 - Geotechnical

  Intrusive surveys to resolve the composition of the upper layers (5 to 10m) of seabed sediment along corridors already subject to a geophysical survey. Collection methods are not limited to, but currently utilise Core Penetration Tests and Vibrocorer sampling. This Page 9 to 37 work includes data collection from the landfall area to offshore. Nearshore, Intertidal and land elements may include the requirement for borehole testing to approximately 20m depth. A variety of companies are being sought that can offer coverage of all areas as well as those that may only offer a subset of the geographical scopes. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit Page 10 to 37 of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH e) Elia Asset NV/SA Page 11 to 37 f) Energinet Eltransmission A/S g) Statnett SF h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does not cause them to be subject to those rules in whole or in part.

  £35,000,000

• Lot 3 - Environmental

  Collection of data to establish the benthic ecology along chosen routes. Currently utilises the interpretation of acoustic geophysical data, video and photographic surveys of the benthic environment and benthic grab/core sampling, although other techniques such as eDNA sampling may be considered depending on the agreement of consent agencies. Laboratory testing of samples and subsequent reporting will be included with this work. This work includes data collection from the intertidal area to offshore. A variety of companies are being sought that can offer coverage of all areas as well as those that may only offer a subset of the geographical scopes. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc Page 14 to 37 b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH e) Elia Asset NV/SA f) Energinet Eltransmission A/S g) Statnett SF h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does not cause them to be subject to those rules in whole or in part.

  £20,000,000

• Lot 4 - Intertidal/Landing

  Non-intrusive survey of the intertidal and topographic elements of the cable landing site utilising bathymetric/topographic lidar and imagery techniques to provide a continuous elevation model and classification of the seabed/land. It is expected that this will be from approximately from the 5m LAT depth contour to at least 250m inland but may extend further in both directions depending on project requirements. While it is expected that manned platforms will be required for some of this work, UAV operations for smaller area requirements may also be suitable. This work may include regular operation and maintenance surveys to assess the physical security of the cable in this zone. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited Page 17 to 37 j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH e) Elia Asset NV/SA f) Energinet Eltransmission A/S g) Statnett SF h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does not cause them to be subject to those rules in whole or in part.

  £15,000,000

• Lot 5 UXO Route Survey

  Collection of both land and marine detailed hi-resolution geophysical data to allow the provision of potential UXO targets to be identified. This will include a range of non-intrusive marine techniques including Multi-Beam Echo Sounders, Side Scan Sonars and Magnetometers but optimised for UXO detection and identification along a narrower route corridor. Land surveys will be in line with industry best practice currently utilising magnetometers only. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited Page 20 to 37 g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH e) Elia Asset NV/SA f) Energinet Eltransmission A/S g) Statnett SF h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does not cause them to be subject to those rules in whole or in part.

  £60,000,000

• Lot 6 UXO Target Investigation. Nearshore Diving

  Following the successful acquisition of UXO Survey data as described in Lot 5, target investigation on identified potential targets is required to confirm status. This nearshore scope is for water depths less than circa 10m where diving is the only practical solution to identify targets due to water depth. Visual identification and a target inspection report is required for each target. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited Page 23 to 37 d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH e) Elia Asset NV/SA f) Energinet Eltransmission A/S g) Statnett SF h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does Page 24 to 37 not cause them to be subject to those rules in whole or in part.

  £15,000,000

• Lot 7 UXO Target Investigation: Offshore ROV

  Following the successful acquisition of UXO Survey data as described in Lot 5, target investigation on identified potential targets is required to confirm status. This nearshore scope is for water depths greater than circa 10m where an ROV solution is possible to identify targets due to sufficient water depth. Visual identification and an inspection report is required for each target. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: Page 26 to 37 a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH e) Elia Asset NV/SA f) Energinet Eltransmission A/S g) Statnett SF h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. Page 27 to 37 It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does not cause them to be subject to those rules in whole or in part.

  £20,000,000

• Lot 8 UXO Clearance/Detonation

  Following the confirmed identification of UXO from Lot 5-7, it is requested that a solution is presented to safely neutralise the ordnance using best industry practice to allow a clearance certificate to be produced. Techniques may include detonation, low-order detonation, Page 28 to 37 removal, or other innovative solutions to safely remove the threat of the confirmed ordnance. The use of bubble curtains and other environmental mitigations may be required dependent on location and size of ordnance. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the Page 29 to 37 framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH e) Elia Asset NV/SA f) Energinet Eltransmission A/S g) Statnett SF Page 30 to 37 h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does not cause them to be subject to those rules in whole or in part.

  £20,000,000

• Lot 9 Low Carbon Geophysical / Small Maintenance Projects

  A non-intrusive survey to provide an initial assessment of potential routes and assessment of the continued physical security of in-service subsea assets. It is expected that this will generally utilise Multi-Beam Echo Sounders and backscatter, as well as Side Scan Sonar and magnetometer for some projects. This work includes data collection from the intertidal area to offshore and involves a comparison of data from previous surveys. Autonomous platforms to reduce the carbon footprint of the operations would be considered for this work and other novel approaches aimed at reducing the carbon footprint of the projects are desirable. Additional information: National Grid UK Limited will conduct the procurement and enter into the framework agreement with the successfully appointed suppliers for its own benefit and for the benefit of the entities identified below. National Grid UK Limited or any of the following entities shall be entitled to call off from the framework agreement and enter into contracts resulting from the call off: 1. Any parent undertakings or subsidiary undertakings (each term as defined in section 1162 Companies Act 2006 except that references in that section to "majority" shall be replaced by reference to "25% or more") of National Grid UK Limited and any subsidiary undertakings of any such parent undertakings at the time of the call off including without limitation: a) National Grid Electricity Transmission Plc b) National Grid LionLink Limited c) National Grid Nautilus Limited d) National Grid Continental Limited e) National Grid Interconnector Holdings Limited f) National Grid Interconnectors Limited g) National Grid North Sea Link Limitedh) National Grid Viking Link Limited i) National Grid IFA 2 Limited j) National Grid NSN Link Limited 2. Any entity that is acting as a project partner with any National Grid call off partner (identified in paragraph 1 above) and which calls off jointly with any such National Grid entity including, without limitation,: a) Scottish Hydro Electric Transmission Plc b) TenneT TSO B.V. c) TenneT TSO GmbH d) TenneT Offshore GmbH Page 33 to 37 e) Elia Asset NV/SA f) Energinet Eltransmission A/S g) Statnett SF h) Transmission system operators and other developers and/or operators of HVDC projects; and/or 3. Any special purpose vehicle, incorporated joint venture or contractual joint venture, between any of the parties identified in paragraphs 1 and 2 above. It should be noted that, whilst National Grid Interconnector Holdings Limited and any of its subsidiaries whether current or future, which hold an interconnector licence, and National Grid Interconnectors Limited, are included within the scope of the Marine Survey Framework agreement, and therefore entitled to call off under it, these entities are not subject to the Utilities Contracts Regulations 2016 or any other relevant procurement regime. These entities' participation in this procurement process and/or the framework agreement does not cause them to be subject to those rules in whole or in part.

  £35,000,000

Award outcome

Award date

15 June 2025

Contract period

— → 30 April 2031

Contract ending soon? Skim tracks incumbents and flags recompetes early. Start for Free to set up alerts.

How to win this tender

Skim reads the notice and every document attached to it, scores the fit against your company profile for a clear bid or no-bid call, then drafts each answer from your own evidence and past bids. You review, refine and submit — on time, with every requirement covered.

See exactly how Skim’s agents do this →

Comparing platforms? Skim is set against the alternatives for pre-tender intelligence, tender management software and bid management software.