Delivering a complex integrated EPC project while supporting long-term client outcomes
Clarke Energy delivered and commissioned a 50MW / 100MWh (2-hour) Battery Energy Storage System (BESS) for EDF power solutions, located in Stockport. Acting as Engineering, Procurement and Construction (EPC) Contractor and Principal Contractor, Clarke Energy provided a fully integrated solution for the design, integration, and delivery of the Balance of Plant (BoP) infrastructure, ensuring single-point accountability across all civil, electrical, and grid interface works.
This transmission-connected scheme required a high level of technical coordination, engineering assurance, and stakeholder management. The battery systems were free-issued by the client, with Wärtsilä appointed as BESS supplier. Clarke Energy’s scope focused on the full delivery of the BOP works, including coordination of all interfaces to ensure safe and compliant integration with the National Grid Electricity Transmission network.
Scope of Works:
- Full design and installation of BOP systems
- Delivery of civil and electrical infrastructure
- Integration with a transmission-level grid connection
- Offloading, installation, and integration of client-supplied BESS equipment
- Site-wide testing & commissioning responsibility
- Coordination with the client, OEM, and transmission network operator
- A 10-year maintenance agreement was also secured for the BOP equipment.
Key Challenges and Solutions:
Ground Conditions
Challenging geotechnical conditions required a robust engineering solution to support heavy infrastructure. Clarke Energy implemented a screw piling solution and constructed a reinforced foundation platform, ensuring long-term structural integrity and eliminating settlement risk.
Noise Constraints
Due to the proximity of residential receptors, strict noise limits applied. Clarke Energy implemented a targeted acoustic mitigation strategy, including a 4-meter-high acoustic barrier along the northern and eastern boundaries and a non-conventional layout solution. This ensured operational noise levels remained within required thresholds and achieved full compliance with planning requirements.
Grid Connection
The project required connection via a tertiary interface to a Super Grid Transformer within the National Grid Electricity Transmission network. Clarke Energy delivered detailed protection studies, managed complex technical interfaces, including 33kV cable installation between the BESS site and grid-compound, and coordinated closely with the transmission operator to achieve successful energisation.
Project Outcome
The project was delivered safely and commissioned in August 2024. It demonstrates Clarke Energy’s capability to deliver complex, transmission-connected BESS projects under an EPC model, effectively managing technical, environmental, and stakeholder challenges while supporting long-term client outcomes through integrated maintenance services.
For more information about Clarke Energy’s battery storage solutions please contact Clarke Energy at 0151-546-4446 or email uk@clarke-energy.com.
