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ocds-h6vhtk-06acd7 · tender

Civils, Buildings, OHL and UGC Framework – Multi Site

Estimated Value

Up to £7,400,000,000

Deadline

16 July 2026

35 days remaining

Published

3 June 2026

Type

works

GBselectiveCPV: 45232210

Overview

This procurement establishes a multi-lot framework for civils, buildings, overhead line and underground cable works across Scottish Hydro Electric Transmission’s large capital delivery portfolio in Scotland. The framework covers six lots: -civils works up to £10m -civils works over £10m -buildings and infrastructure -overhead line pole construction -overhead line tower construction -underground cable construction It is intended to appoint long-term strategic partners with the capability and capacity to deliver design, management, construction, testing and completion works, supporting network investment, renewal, customer connections and the transition to net zero.

The framework has a potential total value of up to £7.4 billion, with lot specific framework appointed for a period up to eight years. Multi disciplinary, interfacing or staged works. 2.

Higher construction, environmental or third party risk. 3. Complex temporary works, geotechnical, hydraulic or structural solutions. 4.

Key points

  • Storage buildings, training school facilities, accommodation and welfare facilities
  • Office buildings
  • Upgrades, refurbishments, and extensions to existing.
  • Internal fit out works to new and existing buildings, including partitions, raised access floors, finishes, cable management systems, containment, and earthing and bonding.
  • Mechanical and electrical fit out of building services within new and existing buildings.
  • Replacement of RAAC roof structures were identified Design Management and Development
  • Establish and manage a suitably qualified design team covering all design and construction aspects of the project.
  • Undertake surveys necessary to complete the project.
  • Carry out gap analysis and value engineering, as appropriate.
  • Develop, complete, and manage design, including managing responses to planning conditions.
  • Prepare interim and final RIBA Stage 4 drawings and reports.
  • Complete room data sheets and room layouts.
  • Prepare and maintain the BIM model for design and construction, including updating any RIBA Stage 3 information produced by others. Planning, Programming and Coordination
  • Develop the Construction Phase Plan and detailed programme.
  • Attend and lead a project kick off meeting to agree deliverable stages and key milestones.
  • Assist with coordination alongside the Project Manager, Project Sponsors, and stakeholder engagement activities.
  • Support utility investigations and statutory enquiries.
  • Prepare planning application deliverables, including DAS, DIAs, visualisations’, noise studies, CTMPs, designs Enabling and Construction Works
  • Undertake any enabling works identified, including service diversion works.
  • Prepare design and specifications, coordinating SSEN T fit out, IT, and OT designs and incorporating these into the Works Information. Health, Safety, Environment and Sustainability
  • Fulfil all duties required of the Main Contractor under CDM Regulations, supporting other duty holders as required.
  • Complete SSEN T Gate process documentation, including but not limited to:
  • Design Risk Management Index (DRMI)
  • Hazard Identification Workshops (Design HAZID, Construction HAZCON, Operational HAZOP)
  • Project safety reviews and reports
  • Develop carbon and sustainability assessments
  • Prepare Environmental Management Plans, Environmental and Biodiversity Net Gain reports. Training School Specific Infrastructure
  • Delivery of offline electrical substation works including substation, associated control, AIS and GIS buildings and OHL works

Key points

  • Detailed design of pole foundations, assemblies and interfaces.
  • Temporary works design associated with pole installation.
  • Design development to support constructability, safety and environmental compliance. Pre construction and enabling works
  • Surveys, setting out and ground investigations.
  • Access provision, compounds, crane pads and working areas.
  • Coordination with land access, wayleaves and stakeholder requirements. Construction
  • Installation of wood, steel or composite poles.
  • Construction of pole foundations, including reinforced concrete, embedded or piled solutions where required.
  • Pole erection, alignment and stability works.
  • Installation of crossarms, insulators, fittings and associated hardware.
  • Conductor stringing, tensioning, sagging and clipping.
  • Installation of earth wires, fibre or auxiliary equipment where specified.
  • Removal, replacement or modification of existing pole structures where required.
  • Tie ins to existing overhead lines and interfaces with substations or transition structures. Testing, commissioning and completion
  • Inspection and testing required to demonstrate compliance with the Works Information.
  • Support to commissioning activities defined in the PSWI.
  • As built records, data capture and handover documentation.

Key points

  • Detailed design of tower foundations and structural interfaces.
  • Temporary works design for excavation support, lifts and erection activities.
  • Design risk management and constructability reviews. Pre construction and enabling works
  • Surveys, ground investigation and setting out.
  • Access tracks, temporary works areas, crane pads and compounds.
  • Environmental mitigation and land management measures. Construction
  • Construction of tower foundations, including piled, reinforced concrete and specialist foundations.
  • Tower steelwork delivery, assembly and erection.
  • Installation of insulators, fittings and tower accessories.
  • Conductor stringing, tensioning and clipping.
  • Removal, replacement or modification of existing towers.
  • Overhead line realignments, deviations and rebuilds.
  • Interfaces with live assets, outages and system constraints where defined in the PSWI. Testing, commissioning and completion
  • Structural inspection, verification and testing.
  • Support to system testing and commissioning activities.
  • Production of as built documentation and asset data.

Key points

  • Detailed design of cable routes, trenching, ducts, joint bays and interfaces.
  • Temporary works and traffic management design.
  • Coordination with consents, planning conditions and third party interfaces. Pre construction and enabling works
  • Surveys, trial holes and utilities investigations.
  • Access, compounds, traffic management and enabling civils.
  • Environmental protection and mitigation measures. Construction
  • Trenching and excavation.
  • Duct installation, bedding and backfill.
  • Construction of joint bays and termination compounds.
  • Cable pulling, installation and protection.
  • Installation of joints and terminations where within Contractor capability and scope.
  • Interface works with substations and overhead line transitions.
  • Surface reinstatement, agricultural reinstatement and environmental restoration. Testing, commissioning and completion
  • Cable testing, verification and commissioning support.
  • Production of as built drawings, GIS data and handover records.

Key points

  • Typically, standalone or enabling works.
  • Limited third party interfaces and temporary works.
  • Defined, well scoped packages with repeatable delivery characteristics. Indicative scope may include:
  • Substation site clearance and earthworks.
  • Foundations for plant (excluding specialist or high risk structures).
  • Internal substation roads, hardstanding and drainage.
  • Access track construction, strengthening and minor realignments.
  • Public road improvements of limited complexity (e.g. passing places, junction tie ins).
  • Standard ducting, cabling, troughing and fencing.
  • Peatland restoration and environmental mitigation work using established methods. This lot is also split into 5 regions across Scotland which bidders can apply for one or more of.

Lots (1)

  • Lot 2Over £10m Civils Characteristics: 1

Additional details

Integration with live substations or critical transmission assets. Indicative Scope Includes: • Complex substation platforms and reinforced foundations. • Complex/lengthy access track construction, strengthening and realignments. • Bridges, retaining walls, culverts and major public road realignments. • Flood defence schemes involving sheet piling, flood walls, pumping stations and storage. • Watercourse diversions, culvert upgrades and return period capacity improvements. • High risk peatland restoration and slope stability works. • Resilient substation adaptations including elevation of existing plant and equipment. • Works requiring significant statutory interfaces, stakeholder coordination or technical approvals.

AI Analysis

Powered by AI — always verify against official documents

Medium Complexity

```json { "overview": "Scottish Hydro Electric Transmission is setting up a long-term framework to find contractors for major electricity network infrastructure work across Scotland. This is a huge multi-lot procurement worth up to £7.4 billion over up to eight years, covering everything from digging trenches for underground cables to building towers for power lines and constructing buildings. The buyer wants strategic partners who can handle design, build, test and handover of complete projects.", "requirements": [ "Capability and capacity to deliver design, management, construction, testing and completion works", "Ability to work on live transmission assets and critical infrastructure", "Understanding of CDM Regulations (Construction Design and Management) and Main Contractor duties", "Competency in RIBA Stage design management (at least Stage 4)", "BIM (Building Information Modelling) capability for design and construction phases", "Knowledge of SSEN T Gate process documentation including Design Risk Management Index and Hazard Identification Workshops", "Health, safety, environment and sustainability compliance and reporting capability", "Experience with planning applications, environmental assessments and biodiversity net gain reporting", "For OHL and UGC lots: experience with high voltage transmission systems (132kV and above)", "For civils lots: geotechnical, hydraulic and structural design/delivery experience where applicable", "For buildings lot: mechanical and electrical services fit-out capability", "Stakeholder coordination and utility investigation management experience" ], "key_tasks": [ "Lot 1 (Civils up to £10m): Substation site clearance, earthworks, foundations for plant, internal substation roads and drainage, access track construction, public road improvements, standard ducting and cabling, peatland restoration (work is split into 5 Scottish regions — bidders can apply for one or more)", "Lot 2 (Civils over £10m): Complex substation platforms and foundations, lengthy access tracks, bridges and retaining walls, flood defence schemes with sheet piling and pumping stations, watercourse diversions, slope stability works, resilient substation adaptations, major public road realignments", "Lot 3 (Buildings & Infrastructure): Design and build storage buildings, training facilities, office buildings, upgrades and extensions; internal fit-out work including partitions and cable management; mechanical and electrical services in buildings; replacement of RAAC (defective concrete) roof structures; establish and manage design teams; prepare RIBA Stage 4 drawings and BIM models; develop construction programmes; undertake enabling works; prepare planning applications with visualisations and noise studies; complete Environmental Management Plans and Biodiversity Net Gain reports; specific delivery of electrical substation buildings and associated control systems for training school infrastructure", "Lot 4 (OHL Pole Construction): Detailed design of pole foundations and temporary works; conduct surveys and ground investigations; install wood, steel or composite poles; construct foundations (reinforced concrete, embedded or piled); erect poles with alignment and stability works; install crossarms, insulators and fittings; string conductors and earth wires; remove/replace existing poles where needed; tie in to existing lines; test and commission to demonstrate compliance; produce as-built records", "Lot 5 (OHL Tower Construction): Detailed design of lattice tower foundations and structural interfaces; temporary works design for excavation and erection; conduct surveys and ground investigation; build tower foundations (piled or reinforced concrete); deliver, assemble and erect steelwork; install insulators and fittings; string conductors; remove/replace/modify existing towers; manage overhead line realignments; manage interfaces with live assets and system outages; structural testing and verification; produce as-built documentation", "Lot 6 (UGC Construction): Detailed design of cable routes, trenches, ducts and joint bays; temporary works and traffic management design; conduct surveys and utilities investigations; excavate and lay ducts; construct joint bays and termination compounds; pull and install cables; install joints and terminations; restore surfaces and reinstate agriculture; cable testing and commissioning support; produce as-built GIS data" ], "how_to_read": [ "This is a 'framework' not a one-off contract — it's a pre-agreed list of approved suppliers that SSEN Transmission will call off work from over up to 8 years. You're not bidding for specific work yet; you're bidding to be on the approved list. Once appointed, you'll compete for individual projects as they arise.", "The 'lots' are separate competitions — Lot 1 covers small civils work (under £10m), Lot 2 covers large complex civils (over £10m), Lot 3 is buildings, Lot 4 is pole towers, Lot 5 is lattice towers, and Lot 6 is underground cables. You can bid for one lot or multiple lots depending on your capability. Lot 1 is also split into 5 regions so you can apply regionally.", "The £7.4 billion figure is the total potential value across ALL lots over the full 8 years — it's not what you'll earn. Real value will depend on which lot(s) you win and what projects get called

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Key Dates

Published

3 June 2026

Submission deadline

16 July 2026

Notice type

tender

Source

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