Battery Energy Storage Systems (BESS) are transforming the way electricity is managed, stored, and delivered. As renewable generation increases, large-scale battery installations are becoming essential to balance the grid, stabilise voltage, and relieve network congestion.
At Reynard, we help developers, EPCs, and cable manufacturers connect these systems safely – from design to commissioning.
Across Europe, grid operators like TenneT recognise that large BESS projects are key to maintaining system stability. They enable:
Balancing services to compensate for fluctuations in wind and solar production
Voltage support and black start capabilities for grid reliability
Congestion management by storing energy where the grid is constrained
However, batteries must not worsen congestion or destabilise the system. That’s where precise engineering and reliable cable terminations make all the difference.
Reynard brings decades of experience from offshore wind to onshore battery integration.
We deliver high-voltage engineering, termination, and testing that ensure every connection performs flawlessly under all conditions.
Our services include:
Each system we work on is tested for reliability, predictability, and full compliance with grid operator standards.
Every project we support starts with one question: What could go wrong if this connection fails?
That mindset — called System Readiness Thinking — prevents costly omissions such as missing point-on-wave switching, improper bonding, or underestimated inrush currents.
By anticipating these issues early, Reynard helps partners deliver projects that pass testing the first time and remain stable for decades.
The Invisible Friction: Avoiding BESS Project Delays in the Balance of Plant A large-scale Battery Energy Storage System (BESS) project doesn’t start slowly. However, BESS project delays often derail momentum
A fully sustainable energy system is no longer a distant dream. With the technology we have today, it is within reach. But to make it work at scale, three elements
Battery Energy Storage Systems (BESS) are rapidly becoming a cornerstone of the global energy transition. By storing electricity and releasing it when needed, BESS facilities support grid stability, balance renewable
Reynard High Voltage Solutions connects the energy transition, one tested connection at a time.
Choosing Reynard means choosing excellence. I’m not just connecting turbines to cables. I’m connecting the future – homes, cars, all to renewable energy. Let’s make it happen, together.
A Battery Energy Storage System is a large-scale installation that stores electrical energy in batteries and releases it when needed. BESS facilities help balance the grid by compensating for fluctuations in renewable energy production, providing voltage support, and managing network congestion. These systems are essential for integrating wind and solar power into modern electricity grids.
Reynard delivers complete high-voltage engineering solutions for battery storage systems, including detailed engineering for HV, MV, and LV cabling, termination and jointing of 33–66 kV connections, resonance and VLF testing up to 66 kV, commissioning and certification to IEC standards, and integration of auxiliary systems and grounding networks.
Reliable cable terminations ensure that battery storage systems connect safely to the grid without causing congestion or instability. Poor connections can lead to system failures, voltage fluctuations, or project delays. Reynard’s offshore-grade engineering ensures every connection performs flawlessly under all operating conditions.
Reynard specializes in medium to high voltage connections, typically ranging from 33 kV to 66 kV for grid integration, along with MV and LV cabling systems and 400 V auxiliary networks. We also provide independent resonance testing equipment rated up to 66 kV for field validation.
System Readiness Thinking is Reynard’s proactive approach that starts every project by asking: “What could go wrong if this connection fails?” This methodology prevents costly issues like missing point-on-wave switching, improper bonding, or underestimated inrush currents, helping projects pass testing the first time and remain stable for decades.
All BESS installations are commissioned and certified according to IEC 60840 and IEC 62067 standards. We perform comprehensive resonance and VLF testing to verify insulation integrity and ensure full compliance with grid operator specifications before energization.
Yes. Reynard provides integrated Balance of Plant (BoP) execution, covering engineering, installation, testing, and commissioning under one roof. This end-to-end approach ensures seamless project delivery and eliminates coordination issues between multiple contractors.
We work with renewable energy developers, EPC contractors, cable manufacturers, and grid operators across Europe who require reliable high-voltage connections for large-scale battery storage installations.
Contact Reynard High Voltage Solutions to discuss your battery storage project requirements. Our team will assess your technical specifications, grid connection needs, and project timeline to develop a tailored engineering and testing solution.
