UK Public Sector Contracts & Tenders

The event seeks to procure a programme of works containing 525kV HVDC land and submarine cabling. The Engineer, Procure and Construct (EPC) and maintenance agreement for the programme will include land and submarine HVDC cable systems between Converter stations or DCSS, design and construction interfaces with the Converter station or DCSS works as required. The aforementioned includes civil works associated with installation of the land cable systems and all maintenance services which are Optional and may be excluded at SSENT’s sole discretion.

The event seeks to procure a programme of between 1.8 and 2 GW HVDC Converter Stations. The Engineer, Procure and Construct (EPC) and maintenance agreement for the programme will include: HVDC system design and testing, Procurement and installation of HVDC equipment, Commissioning of HVDC system, Civil requirement specification and Design deliverables to allow civil interface design to be completed, Sequencing of works as required to align with civil Construction, High Voltage Alternating Current (HVAC) Cable system between HVDC Converter and AC Substations including all required design and construction interfaces, Maintenance of the operational system for a period that aligns with the agreed performance guarantee duration or 5 years, whichever is more. The event excludes civil engineering and associated works. The aforementioned includes the installation of the High Voltage equipment and maintenance services which are Optional and may be excluded at SSENT’s sole discretion.

Scottish Hydro Electric Transmission Plc (SHET, the Authority) intends to award framework agreements to contractors who have the necessary capacity, capability, and expertise to deliver compensatory planting schemes as fully detailed in the procurement documents. Significant expansion in renewable generation in the SHET network area has driven a need to undertake a series of network reinforcement and expansion projects to increase capacity and improve network security. This work includes the building and rebuilding of Transmission overhead lines, the development of grid substations, converter stations and underground cable systems. Due to the extent of this project portfolio, forestry is inevitably affected, and woodland removal is required in project areas to facilitate the construction and reinforcement of Transmission infrastructure. In response to this a significant volume of compensatory planting will be required. Compensatory planting will be required to support projects under RIIO T2, ASTI and RIIO T3. The objective of this tender to engage a sufficient competent pool of contractors to ensure that compensatory planting can be delivered throughout the SHET network area. Full details of the opportunity can be found at https://sse.app.jaggaer.com/ under "Current Opportunities".

Scottish Hydro Electric Transmission Plc. (“SHET”), seeks a market leading supplier of cloud based file storage and collaboration solutions. The solution provided should be able to handle proprietary specialist file types such as Geospatial Information System (GIS), engineering design (e.g. AutoCAD), Building Information Management (BIM) and 3d laser scans, in the near term up to 50GBb individual file size and collections >30TBb, performantly and without any loss/degradation, sync error or corruption. The solution needs to provide a user interface that separates the users from directly accessing the back end storage. This user interface needs to be intuitive and provide a positive user experience. The solution will provide options to share files with internal and external collaborators which may be via login, link share or other methodologies. The solution will provide out of the box interoperability which will enable files to be surfaced (via connector/bridge/API or other methods) via cloud based SAAS applications such as Autodesk Construction Cloud, IBM Maximo, and ESRI ArcGIS, plus SharePoint and Microsoft O365. It is preferable that any connector/option has been proven in industry with similar clients. The vendor must provide a means of migrating data from legacy sources into the cloud storage. The solution should be hosted in the UK only and highly cyber-secure and resilient, and support all access control requirements. The solution should have a strong business-continuity-and-disaster-recovery offering. The provider should provide timely high quality project delivery services and excellent post implementation customer support options. Note that the SHET has confirmed through proofs of concept that generic file storage (as may be appropriate for office documents) may not be suitable for all such file types and so prospective tenderers are encouraged to carefully validate if their solution can handle such files.

**Note; for suppliers to be registered for Jaggaer system (if not already registered on SSE Jaggaer) they should contact the representative listed on this notice** ================================ Scottish Hydro Electric Transmission (SHET) seek a skilled provider of network and security consulting and project delivery services to design and deliver a major IT + OT network and authentication re-structure. The objective of the project is to further separate SHET network zones from other SSE BU networking, enabling SHET to apply networking changes in a more agile way with less inter-group dependency. The projects span both IT and OT (operational technology). The current network design is complex with a disparate combination of separate and shared services with other SSE businesses. It is important that the design for the "To-Be" solution minimises the risk to the business during the transformation from the current network architecture to the future model. Suppliers should appreciate transition will be undertaken in the context of a live operating environment. This project will help ensure SHET continue to meet the NIS Directive CAF (Cyber Assessment Framework) B2 principle and contributing outcomes in the RIIO-T3 Ofgem regulatory period. • In 2025 the project will define a costed strategy, architecture secure design, support model and execution plan for SHET to meet its desired network and security outcomes. • In 2026 execution of the approved design will follow as part of the RIIO-T3 regulatory period. On-site execution will take place across the territory of Scotland. It is desirable that the supplier have the capability to provide IT managed services and project delivery services (for example but not limited to networking, infrastructure, cybersecurity specialisms) and professional services as this may be a future requirement. Due to the nature of the work involved, it is anticipated that the supplier and any sub-contractor personnel will be UK based and where necessary their employees assigned to the programme or with access to SHET data may be required to hold appropriate security clearance for their role. To successfully deliver the project, the design and execution phases must address and deliver solutions that: 1. Improved Transmission OT systems and network, with increased cyber security prevention and avoidance of risk. 2. Maintenance of SHET compliance with the CAF Principle B2 and preparation to meet the Enhanced CAF Profile once released. 3. Enable SHET to: a. Drive towards network independence whilst retaining benefits of sharing wider corporate network where beneficial to do so , b. Enable initiative-taking risk avoidance and management, and increased ability to accommodate future cyber and functional changes. 4. Strengthens SHET overall network security posture while also making it easier to monitor and track traffic throughout SHET network. 5. Solution will need to be scalable to support anticipated future business growth.

The Eastern Green Link programme ("EGL") is being delivered as a Joint Venture ("JV") between Scottish Hydro Electric Transmission ("SHET") and National Grid Electricity Transmission ("NGET"). In order to support this capital programme SHET is going to market on behalf of itself and the JV partners for a new software application to support the workforce management of the staff delivering the EGL projects. In addition to the EGL projects, the workforce management software may separately be used for internal projects by the JV partners, including SHET and its SSENT Offshore business area. This capability encompasses all aspects of people planning, scheduling and allocation to ensure the timely and successful execution of the projects. The delivery team's capability focuses on resource management and forecasting or varying lengths (e.g. Monthly, Annual, 5years, 10years), recruitment tracking, and operational efficiency. It includes aspects of analytics, planning, and capacity management to ensure the project resource is optimised. The capability supports the creation of detailed people plans, alignment of team skills with project requirements. Furthermore, it integrates with project delivery tooling to provide a comprehensive view of people-related metrics, facilitating informed decision-making and quick response to any project changes or challenges. This capability is crucial for managing a large, geographically dispersed team and ensuring that each phase of the construction adheres to scheduled timelines and quality standards. At present, the Workforce Planning teams use manual processes which are updated on Excel and Visio. The updates require the resource manager to send multiple forms monthly, where managers are expected to input the relevant information regarding staff changes, new starters, leavers etc. which they then send back to the resource manager who then manually updates the organisation chart and forecasted staff plan. We anticipate the purchase of a Commercial Off The Shelf, Software As A Service, solution, from a skilled and experienced provider in this field. Current anticipated volumes of users (subject to change) is 135 managers and 3500 colleagues/resources to manage.

Scottish Hydro Electric Transmission Plc. (the "SHET"), seeks a market leading supplier(s) of overhead line LiDAR scanning. The solution will be delivered in PLS-CADD design file and ArcGIS file formats. SHET has identified 4887km of overhead lines in scope for this project, the detail of which will be supplied as shape files readable by GIS software packages. The solution is expected to be a framework for this project and potential future purchases. The solution must provide LiDAR scanning of sufficient resolution to capture the overhead line including sag between transmission structures, the condition of transmission structures, the terrain and surrounding objects to a total width not less than 150m, centred on the overhead lines. Digital stills will be taken of transmission structures and incorporated into the solution such that they can be called from GIS for a particular location. Reference points must be used to accurately position the scanned overhead lines and transmission structures relative to the British National Grid. Post processing must be completed to apply defined feature codes to classify objects and structures captured during scanning. The provider(s) should provide timely high quality project delivery services and excellent post implementation customer support options. The provider should be able to obtain all licenses/certificates required to carry out the work and meet short delivery schedules. To participate in the procedure the supplier should submit a pre-qualification questionnaire on the SHET's source-to-contract system Jaggaer.

Scottish Hydro Electric Transmission Plc. (the “SHET”), seeks a market leading supplier of project intelligence solutions. The solution provided should analyse proposed project programmes and be capable of: Assessment of project programme for schedule integrity and likelihood of successful delivery within proposed timelines Identifying activities, dependencies, critical path, milestones and risks Test mitigation plans and time savings that could be realised Monitoring progress vs plan and highlight risks to the schedule Account for scheduling changes and project revised milestone/completion dates, and reassess risks Provide a reporting suite for visibility and to inform decision making Support supply chain partners, in addition SHET employees to optimise projects Perform analysis and provide intelligent metrics at project and portfolio levels The proposed solution should meet the following: Commercial Off The Shelf (COTS) Easy to use interface for primary users Data storage (both production and recovery systems) geofenced to the UK/EU The supplier should provide timely high quality project delivery services and excellent post implementation customer support options Be capable of delivery to NEC4 standards

Scottish Hydro Electric Transmission Plc (SHET) trading as SSEN Transmission has identified a requirement to establish an OT specific Framework of suppliers to maintain a dedicated pool of suppliers to support the successful delivery of our T3 programme. Details of the programme can be found at Our RIIO-T3 Business Plan - SSEN Transmission

Scottish Hydro Electric Transmission Plc (SHET) trading as SSEN Transmission has identified a requirement to establish an OT specific Framework of suppliers to maintain a dedicated pool of suppliers to support the successful delivery of our T3 programme. Details of the programme can be found at https://www.ssen-transmission.co.uk/globalassets/documents/riio-t3-documents/ssent-riio-t3-business-plan.pdf *** Original notice published is Notice identifier: 2025/S 000-020450. This notice is to reflect change to dates, including change of deadline for PQQ responses from 09.06.25 @12:0 to 16.06.25 @12:0 ***

Scottish Hydro Electric Transmission Plc (SHET) trading as SSEN Transmission has identified a requirement to establish an OT specific Framework of suppliers to maintain a dedicated pool of suppliers to support the successful delivery of our T3 programme. Details of the programme can be found at https://www.ssen-transmission.co.uk/globalassets/documents/riio-t3-documents/ssent-riio-t3-business-plan.pdf NB. Original notice published is Notice identifier: 2025/S 000-020450 & updated on notice identifier 2025/S 000-031698. This notice is to reflect change to dates, including change of deadline for PQQ responses from 16.06.25 @12:0 to 20.06.25 at 12:0

Scottish Hydro Electric Transmission Plc. (the “SHET”), seeks a market leading supplier of project intelligence solutions. The solution provided should analyse proposed project programmes and be capable of: Assessment of project programme for schedule integrity and likelihood of successful delivery within proposed timelines Identifying activities, dependencies, critical path, milestones and risks Test mitigation plans and time savings that could be realised Monitoring progress vs plan and highlight risks to the schedule Account for scheduling changes and project revised milestone/completion dates, and reassess risks Provide a reporting suite for visibility and to inform decision making Support supply chain partners, in addition SHET employees to optimise projects Perform analysis and provide intelligent metrics at project and portfolio levels The proposed solution should meet the following: Commercial Off The Shelf (COTS) Easy to use interface for primary users Data storage (both production and recovery systems) geofenced to the UK/EU The supplier should provide timely high quality project delivery services and excellent post implementation customer support options Be capable of delivery to NEC4 standards

Scottish Hydro Electric Transmission Plc (SHET) trading as SSEN Transmission has identified a requirement to establish an IT Digital Services Framework of suppliers to maintain a dedicated pool of suppliers to support the successful delivery of our T3 programme. Details of the programme can be found at https://www.ssen-transmission.co.uk/globalassets/documents/riio-t3-documents/ssent-riio-t3-business-plan.pdf

SSENT is responsible for delivering complex technology and network solutions for electricity system transmission infrastructure, both offshore and onshore. This includes HVDC, FACTs, AC networks, cable systems, and offshore installations This Prior Information Notice is seeking expressions of interest from suppliers who can provide a range of Specialist Engineering services. SSENT is currently developing a formal tender for the provision of Specialist Engineering services, which it is aiming to launch within the next 2 months. The Specialist Engineering Services will be contracted under a non-committal framework(s) and will run for an initial 3-year period, with options for a further 2 x 1-year extensions (subject to agreement by SSENT) SSENT requires suppliers who have the necessary resources and technical capabilities to provide the services which are anticipated, but not limited, to include the following: Civil & Building: Expertise in civil, building, and construction works related to HVDC and FACTS devices. HVDC & FACTS: Expertise in all aspects of HVDC and FACTS devices. Cable Systems: Expertise in HV Cable Systems, covering both AC and DC technology for land and submarine applications. AC Networks: Expertise in all aspects of AC Networks. Offshore and Subsea Services: Expertise in preparing requirements and specification documents to provide technical direction and governance for the design, delivery, operation, maintenance, and decommissioning of offshore substation installations. It is anticipated these Services will be Lotted Minimum Criteria to be invited to take part in a Tender: Suppliers must return their Expression of Interest by the deadline date to be invited to take part in a pre-qualification (PQQ) process. Only suppliers that pass the PQQ criteria will be invited to take part in the Invitation to Tender (ITT). Subsequent PQQ and ITT activity will be managed via the Jaggaer Sourcing Portal. Please email your Expression of Interest to Janis Hepburn - Senior Category Manager at: janis.hepburn@sse.com If you have any further questions, please email them to the address above. The deadline for submission of your Expression of Interest is 12:0 hours 8th August 2025

SSEN Cable Installation Projects and Associated Activities will require Marine Warranty Services to be provided by a suitably qualified Marine Warranty Surveyor.

With our growth towards Net Zero, SSEN Transmission are looking to award a multi lot geographically split Minor Maintenance Framework contracts to maintain our sites to high standards. Within the Contracts, we are looking for contractors who will manage – Defect correction and planned maintenance across 180 sites. What we are looking for: Local construction companies with the knowledge and expertise to undertake our works within our safety systems. An example but not exhaustive list of works covered under this framework would be: • General Building Work • Roofing works, flat and pitched • Plumbing & Drainage systems • General Building Work • Fencing • Metal & fabrication works • Painting & Decoration • Joinery & Carpentry • Bricklaying • Cladding • Plastering • Groundworks • Mechanical & electrical in conjunction with general building works • Large Doors Overhaul • Winter maintenance With an expected total Contact value across all lots and suppliers of up to £5.5 million (approx. £30k per site) this gives the opportunity for small new to SSEN contractors to deliver these essential maintenance works on sites all over Scotland. The purpose of this market engagement is to gather information from the market at this stage only. This engagement does not constitute a pre-qualification process, a tender, or a guarantee of any future procurement opportunities. Participation in this process does not imply any commitment by SSEN to enter into agreements, award contracts, or proceed with the delivery of the requirement. The details provided are not final or binding. They serve as a preliminary guide or general indication. Changes may occur based on market conditions and final requirements. Suppliers interested in bidding must register interest via email to Kirsty.Cleland@sse.com by 17:0 29th October 2025.

With our growth towards Net Zero, SSEN Transmission are looking to award a multi lot geographically split Minor Maintenance Framework contracts to maintain our sites to high standards. Within the Contracts, we are looking for contractors who will manage – Defect correction and planned maintenance across 180 sites. What we are looking for: Local construction companies with the knowledge and expertise to undertake our works within our safety systems. An example but not exhaustive list of works covered under this framework would be: • General Building Work • Roofing works, flat and pitched • Plumbing & Drainage systems • General Building Work • Fencing • Metal & fabrication works • Painting & Decoration • Joinery & Carpentry • Bricklaying • Cladding • Plastering • Groundworks • Mechanical & electrical in conjunction with general building works • Large Doors Overhaul • Winter maintenance With an expected total Contact value across all lots and suppliers of up to £5.5 million (approx. £30k per site) this gives the opportunity for small new to SSEN contractors to deliver these essential maintenance works on sites all over Scotland. The purpose of this market engagement is to gather information from the market at this stage only. This engagement does not constitute a pre-qualification process, a tender, or a guarantee of any future procurement opportunities. Participation in this process does not imply any commitment by SSEN to enter into agreements, award contracts, or proceed with the delivery of the requirement. The details provided are not final or binding. They serve as a preliminary guide or general indication. Changes may occur based on market conditions and final requirements. Suppliers interested in bidding must register interest via email to Kirsty.Cleland@sse.com by 17:0 29th October 2025.

SSEN Cable Installation Projects and Associated Activities will require Marine Warranty Services to be provided by a suitably qualified Marine Warranty Surveyor.

This tender process seeks to award framework for the manufacture and delivery of 132kV-400kV AC Land Cable Systems to Scottish Hydro Electric Transmission plc. This opportunity is split into 2 lots: - 132kV Cable Systems - 275/400kV Cable Systems The Objectives of the framework are as follows: - For the Supplier to undertake the manufacture and supply of underground cable systems at 132kV and/or 275kV up to and including 400kV that have been approved for installation and operation on the SSEN Transmission Network. - That the projects will be completed on time and on budget without any Health and Safety infringement or accidents. - That designed cable system offers a 40-year design life and complies with the parameters set out in this goods information package. - The Supplier liaises efficiently and effectively with all other parties.