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At GreenEngineering, we've helped reduce global carbon emissions by over 50 million tons through our innovative sustainable solutions.
Learn about our impactAt GreenEngineering, we've helped reduce global carbon emissions by over 50 million tons through our innovative sustainable solutions.
Learn about our impactGreen Engineering Ltd was appointed as the principal consultant for the Thurrock Power 275kV
Green Engineering Ltd was appointed as the principal consultant for the Thurrock Power 275kV, 750MW collocated GAS and Battery Energy Storage System (BESS) Peaker Project. This strategically important development involved complex interfacing with National Grid infrastructure and included major consultancy responsibilities across both the private developer scope and National Grid's regulated network.
Our remit covered a broad range of engineering and compliance services, including route planning for a 275kV cable circuit, horizontal directional drilling (HDD) feasibility, and the coordination of a User Self Build (USB) connection into a live 275kV National Grid substation.
Private Energy Developer (confidential)
Principal consultancy for private developer scope
Interface consultancy for National Grid infrastructure
275kV cable route assessment and HDD feasibility
User Self Build (USB) coordination and compliance support
National Grid procedures and standards assurance
Site surveying and as-built verification
Chairing of design review and compliance meetings
Master drawing review and redlining to as-built stage
Our involvement focused on one of the most technically sensitive areas of the project: a 275kV high-voltage connection incorporating both gas and battery-based generation. The scope required intricate planning of the cable route, including consideration of environmental constraints, underground obstacles, and land access.
A key challenge was the implementation of horizontal directional drilling (HDD)—a specialist trenchless technique—across critical infrastructure zones to facilitate the installation of the high-voltage cable. Our team conducted detailed feasibility analysis and design coordination to ensure HDD could be successfully integrated within the route.
The project included a new 275kV bay within a live National Grid substation under a USB (User Self Build) arrangement. This involved highly controlled coordination with National Grid to ensure all civil, electrical, and interface designs met the exacting standards required for build-out within a live operational environment.
As the principal consultant, we ensured the USB process followed all National Grid governance, including submissions to the appropriate stage gates, participation in joint review sessions, and alignment with National Grid’s STCP and EIS standards.
Following initial construction works, we supported the National Grid team in bringing all key documentation and master drawings up to as-built status. This included site surveying, verification of installed assets, and drawing redline markups—ensuring a complete and accurate record of the final layout was handed over.
This process not only ensured technical accuracy but also fulfilled National Grid’s legal and procedural obligations regarding system diagrams and asset records.
Green Engineering Ltd played a leading role in compliance management and stakeholder coordination throughout the lifecycle of the engagement. Our consultants chaired design review and compliance meetings between the developer and National Grid, ensuring all actions, documentation, and designs aligned with programme requirements and regulatory expectations.
We acted as the critical link between private development interests and regulated network standards—bridging the gap with technical fluency, procedural knowledge, and impartial oversight.
Green Engineering Ltd delivered a technically robust, fully compliant consultancy package that enabled the project to progress through National Grid’s design and assurance processes with clarity and efficiency. Our work laid the foundation for the physical connection of a large-scale GAS and BESS peaking plant into the national transmission network—supporting both system flexibility and secure capacity at a time of increasing grid demand.
Our technical leadership, attention to regulatory detail, and collaborative working with National Grid personnel were instrumental in progressing this major infrastructure connection toward delivery.
Voltage Level: 275kV
Capacity: 750MW
Technologies: Collocated Gas Peaker Plant + Battery Energy Storage System
Interfaces: National Grid USB / Live Substation
Engineering Features: Horizontal Directional Drilling, High-Voltage Cable Routing
Project Stage: Design, compliance, and as-built documentation
