National Grid
Engineering Critical UK Infrastructure
Discover TES Limited’s extensive portfolio of National Grid projects. From protection system upgrades and SPAR programmes to complex substation engineering, we deliver resilient high-voltage solutions across the UK transmission network.
Detail Projects
Case Studies
Powering the Transmission Network
As a long-standing partner to the National Grid, TES Limited plays a pivotal role in maintaining and upgrading the UK’s high-voltage transmission network. Our engineering teams possess the specialised authorisations and deep technical knowledge required to deliver complex infrastructure projects within strictly regulated environments.
We provide comprehensive engineering support, from protection systems design and type registration to full-scale substation engineering and asset replacement. Our track record demonstrates a commitment to grid reliability, safety, and operational excellence.
Grid Code Compliance:
We ensure every design and installation adheres strictly to National Grid specifications (NGTS) and safety rules.
Authorised Engineers
Our staff hold necessary National Grid Persons and BESC authorisations for independent substation access.
End-to-End Management
From initial interface engineering to final commissioning and handover
Protection & Control Upgrades
Our core expertise lies in the modernisation of critical protection infrastructure. We ensure that aging assets are replaced with state-of-the-art systems that meet modern grid code requirements and enhance network stability.
Key Deliverables:
- NICAP Feeder Protection Replacement: We have successfully delivered comprehensive protection replacements at strategic transmission sites. Notable projects include:
- Thorpe Marsh – West Melton / Eggborough / Drax
- High Marnham – Thurcroft – West Melton (3-ended circuit)
- Pentir – Wylfa & Pentir – Dinorwig
- Blyth – Tynemouth & South Shields
- Mesh Corner Protection: Specialised refurbishment of Mesh Corner and Mesh DAR (Delayed Auto Reclose) protection systems to ensure fault clearance and system resilience.
- Sites: Thorpe Marsh 400kV, Berkswell MC6, Monk Fryston MC2 & 3, and South Shields MC1 & 2.
Selective Protection Asset Replacement (SPAR
TES Limited is a key delivery partner for the National Grid’s SPAR programme, aimed at extending the operational life of critical assets through targeted intervention and replacement.
Supergrid Transformers (SGT) & Mechanically Switched Capacitors (MSC):
We have executed complex replacement works across the country, minimising outage times and ensuring seamless integration with existing schemes.
- SGT SPAR: Works completed at Monk Fryston, North Hyde, Skelton Grange, Chessington, and Tynemouth.
- MSC SPAR: Upgrades at Kirkby, Bradford West, Capenhurst, and West Melton.
- Mesh Corner SPAR: Targeted replacements at Monk Fryston and Chessington.
Substation Control Systems (SCS):
We modernise control interfaces to improve operator visibility and network management, including SCS replacements at Burwell, Bridgwater, and South Shields.
Major Substation Engineering & Infrastructure
Beyond asset replacement, we deliver large-scale infrastructure projects that expand grid capacity and functionality.
Elstree 400/132kV Substation Expansion:
We delivered a significant 8-bay Gas Insulated Switchgear (GIS) extension at Elstree. This comprehensive project included the installation and commissioning of Bus Sections, Bus Couplers, Feeders, and Transformers, significantly bolstering the substation’s capability.
Circuit Breaker & Switchgear Works:
Our teams handle the installation and replacement of primary plant equipment, ensuring safe and reliable switching operations.
- Walham – Pembroke: Feeder Circuit Breaker installation.
- Chickerell – Exeter: Feeder Circuit Breaker installation.
- Wincobank & Manchester South: Complete Circuit Breaker replacements.
Technical Compliance & Type Registration
Navigating National Grid’s rigorous technical standards requires precision and experience. TES Limited supports manufacturers and the Grid by managing the Type Registration process, ensuring new technologies are approved for use on the network.
- Static Synchronous Series Compensation: Equipment protection type registration for various sites.
- SGT LV Connections: Circuit Breaker Control and BUP Protection Type Registration.