Battery Energy Storage System (BESS)

Key Service Offering – Battery Energy Storage System (BESS)

RSGx delivers end-to-end electrical solutions across utility-scale Battery Energy Storage Systems (BESS) and hybrid renewable projects. Our integrated model spans design, balance of plant (BOP) delivery, high-voltage installation, commissioning, and operational readiness - providing a single point of accountability from concept through to energisation.

Design and ECI

RSGx partners with developers, OEMs, and EPC contractors during early contractor involvement to drive practical, buildable, and cost-effective electrical designs for BESS and hybrid (solar + storage) projects.

Leveraging experience across transmission, substations, and complex infrastructure, we support:

  • Grid connection and network compliance strategies
  • Optimised plant layout and cable routing
  • Constructability and staging methodologies
  • Integration of BESS, solar, and HV infrastructure

Our focus is on delivering designs that minimise rework, reduce programme risk, and align with real-world construction and commissioning constraints.

BOP (Electrical) – BESS & Solar

RSGx delivers full Balance of Plant (BOP) electrical scopes for utility-scale BESS and co-located solar projects.

Our capability includes:

  • HV & LV reticulation systems
  • Inverter and battery system integration
  • DC, AC, and auxiliary systems
  • Instrumentation and controls.
  • Network and communications systems.
  • Earthing, cabling, and containment
  • Integration of OEM equipment into overall plant architecture

We understand the critical interfaces between OEM-supplied equipment and BOP infrastructure, ensuring seamless integration, efficient installation, and readiness for commissioning.

HV Installation & Commissioning

RSGx provides specialist high-voltage installation and commissioning services, taking full ownership of energisation scopes across BESS projects.

We deliver commissioning from 415V through to 330kV, including:

  • Substations (AIS & GIS) and grid connection works
  • Protection and control systems
  • Power transformers and switchgear
  • SCADA and communication systems
  • Testing, energisation, and grid compliance verification

Our commissioning teams are structured to engage early, ensuring systems are progressively tested, defects are minimised, and energisation is achieved without last-minute programme risk.

PTW, LOTO & Energisation Support

RSGx establishes and manages robust Permit to Work (PTW), Lock Out Tag Out (LOTO), and energisation frameworks across live construction and commissioning environments.

Our approach includes:

  • Development and implementation of project-specific PTW/LOTO systems
  • Dedicated Permit Control Officers and HV operators
  • Structured energisation planning and isolation coordination
  • Oversight of subcontractor compliance during installation, testing, and commissioning

By taking ownership of these critical controls, we reduce interface risk, improve safety outcomes, and maintain alignment with programme milestones during energisation phases.

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Integrated Delivery Advantage

RSGx provides a seamless delivery model across BESS projects, bridging the gap between design, construction, and commissioning.

We understand where projects succeed and where they fail: at the interfaces.

Our strength lies in managing these interfaces end-to-end, ensuring BESS assets are delivered safely, energised efficiently, and fully operational from day one.

Engineering & Advisory

Construction Projects

Commissioning & Completions

Maintenance & Operations

Contact us for more information on a specific service or a copy of our full capability statement.

We deliver for clients across Australia, North America, UK, Africa and the Middle East.

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