Fortescue has brought a large-scale battery energy storage system (BESS) online at North Star Junction to support its Australian mining operations, signaling another step in the company’s push to decarbonize and strengthen the resilience of its electrical systems. The installation uses BYD technology and is designed to smooth demand, store excess energy and improve power quality across critical mine-site loads. This is part of a planned 4-5 GWh rollout of battery storage systems.
The NSJ BESS consists of 48 storage containers. They have a total capacity of 250 MWh and a nominal discharge rating of 50 MW for five hours. The battery will supply Fortescue’s 100 MW solar farm at NSJ and integrate into the Pilbara Energy Connect (PEC) network. It is the largest battery deployed in the company’s mining operations.
The company says the system will help reduce reliance on conventional generation while improving the stability needed for heavy industrial processes. For mining operators, that translates to fewer fuel deliveries, lower maintenance on rotating equipment and a more predictable energy profile that supports fleet electrification and automated operations.
Beyond the announcement, the significance for commissioning and project teams is clear. Bringing a utility-scale battery into a live industrial network requires disciplined planning and execution from factory acceptance through performance testing. Success hinges on how well the hardware, controls and protection schemes are integrated and verified before the unit is allowed to support production.
Key activities typically covered during commissioning on a deployment like this include:
- Verifying design and interconnection against network studies and protection coordination.
- Completing factory and site acceptance tests for the battery racks, power conversion system, step-up transformers and switchgear.
- Integrating the battery management system and energy management system with site SCADA, including alarms, historian tags and operator controls.
- Exercising functional modes such as peak shaving, load shifting, voltage and frequency support, and reserve or contingency response.
- Running reliability trials under varying temperatures and charge rates to confirm thermal performance and balance across strings.
- Testing abnormal and emergency scenarios, including loss of communications, islanding conditions, overcurrent events and controlled shutdowns.
- Confirming fire detection and suppression, ventilation, hazardous area classification and egress meet site safety requirements and applicable Australian standards.
For operators, the value of a battery is captured in day-to-day dispatch. That means clear operating envelopes, setpoints and handover documentation are as important as the hardware itself. Operations teams should leave commissioning with:
- Defined state-of-charge windows aligned with warranty and lifecycle targets.
- Tested ramp rates and droop settings that prevent nuisance trips and harmonics.
- Alarm rationalization and response procedures that fit existing control room practices.
- Cybersecurity controls for remote access, configuration management and patching on the operational technology network.
BYD’s lithium iron phosphate chemistry is widely used for stationary storage because of its thermal stability and cycle life. Containerized systems can be deployed quickly, but they still require careful civil works, earthing, cable routing and environmental controls to support long-term reliability in harsh mining conditions.
The battery’s role extends beyond efficiency. In remote mining regions, even brief voltage dips and frequency excursions can interrupt conveyors, mills and processing plants, adding cost and risk. A properly tuned BESS can mitigate these events, provide ride-through capabilities and reduce the need to oversize generation for rare peaks. Where on-site renewables are present or planned, storage also allows Fortescue to capture intermittent generation and shift it to match production schedules.
Training and handover are critical milestones. Commissioning teams typically deliver operator and maintainer training, spares lists and warranty workflows, so issues discovered in early operation feed back into vendor support. Clear lines of responsibility for firmware updates, relay setting changes and EMS tuning help prevent configuration drift after commercial operation.
For project leaders elsewhere in the sector, the effort at North Star Junction offers a practical template:
- Start grid and protection studies early to align with battery capabilities.
- Co-develop dispatch strategies with operations to ensure value from day one.
- Budget sufficient time for system integration and soak testing under real loads.
- Treat safety, emergency response and cybersecurity as integral commissioning deliverables, not add-ons.
Fortescue’s deployment underscores how storage is moving from pilot projects to core infrastructure in heavy industry. As miners seek to cut emissions and improve availability, batteries are becoming an essential part of the electrical architecture. The North Star Junction system is a visible marker of that shift and a reminder that rigorous commissioning is what turns a promising asset into dependable, production-ready capacity.
The next BESS installation is expected at Eliwana mine in early 2026.
Photo Credit: Fortescue
