The shift from diesel to battery-electric vehicles in Australian underground mining isn’t a future possibility — it’s happening now. Fortescue, BHP, South32, and Newmont have all committed to electrification programs for their underground fleets. OEMs including Sandvik, Epiroc, and Normet are shipping battery-electric LHDs, trucks, and development drills to Australian mine sites. And the drivers behind this shift — ventilation cost savings, carbon commitments, and tightening diesel particulate regulations — aren’t going away.

For mining operations teams and electrical engineers planning or managing these transitions, the focus naturally falls on the vehicles themselves: range, charging time, battery performance in hot humid underground environments. But there’s a critical infrastructure challenge that often gets underestimated until a machine is already on site: cable management for electric mining vehicles is fundamentally different from anything the diesel era required.

This article explains exactly how and why — and what Australian mine operators need to plan for.

Key Takeaways

• Battery-electric mining vehicles require significantly higher charging currents than diesel-era trailing cable systems were designed to handle
• Opportunity charging during operational cycles — not just end-of-shift charging — is the model most EV mining OEMs are designing toward
• Cable handling systems for EV mining equipment must manage heavier, higher-rated cables across more frequent connection cycles
• Fast-charging infrastructure in underground roadways introduces new cable routing, storage, and protection requirements
• Australian mines are already deploying purpose-built EV cable management systems — Fortescue’s Pilbara operations are a live example

Diesel vs Electric: What Actually Changes Underground

To understand the cable management challenge, it helps to first understand what changed in the power architecture when a mine goes electric.

In a diesel underground mine, the electrical distribution system powers fixed infrastructure: lighting, ventilation fans, crushers, conveyors, and the distribution points for mobile machine trailing cables. Mobile machines are self-powered by their diesel engines. The trailing cables that connect mobile machines to the distribution system carry modest currents — primarily for machine controls, communications, and auxiliary systems — not the main drive power.

In an electric underground mine, the mobile machines themselves are powered from the electrical distribution system — either continuously via a trailing cable, or intermittently via a charging connection. This fundamentally changes the current demands on the cable infrastructure.

Cable Management Requirements

• Trailing cables carry controls and comms — low current
• Cable ratings typically 100–400A
• Predictable, repetitive machine cycles
• Charging infrastructure not required underground
• Standard cable drum trailers and reel systems sufficient
• Cable connection cycles relatively infrequent

✓ Electric Era

Cable Management Requirements

• Cables carry main drive power — high current
• Cable ratings 400A–1,600A+ for fast charging
• Opportunity charging during operational pauses
• Fast-charge bays distributed throughout mine
• Purpose-built EV cable trailers and management systems
• High-cycle connector systems rated for frequent engagement

The Four Cable Management Challenges Specific to EV Mining Equipment

Higher Cable Ratings and Weight

Fast-charging an electric LHD or mining truck requires substantially higher current than anything a diesel-era trailing cable system was designed for. Cables rated for 800A or 1,200A are significantly heavier per metre than standard trailing cables — the drum capacity, spindle strength, and drive motor sizing of any cable handling system must be recalculated from scratch for EV charging cables.

Opportunity Charging Cycles

Unlike diesel machines that refuel at shift end, battery-electric vehicles charge opportunistically — during loading pauses, shift changes, or planned operational breaks. This means far more frequent cable connect/disconnect cycles per shift. Connectors and cable management systems must be rated for high-cycle operation without degradation of insulation integrity or connector contact quality.

Underground Cable Routing and Storage

Fast-charging bays distributed throughout the underground mine roadway network create new cable routing and storage challenges. Heavy charging cables left on the mine floor — even temporarily during a charging cycle — are vulnerable to the same crushing and abrasion damage as trailing cables. Purpose-built cable management at charging bays is essential, not an afterthought.

Thermal Management of High-Current Cables

High charging currents generate heat in the cable. In an underground environment with limited ventilation compared to a surface installation, cable thermal management becomes a design consideration — cable routing that minimises coiling during charging, adequate cable sizing above the minimum rated current, and spacing between cable runs all affect heat dissipation and therefore cable service life.

Trailing Cable Systems for Continuously-Powered EV Equipment

Not all electric mining vehicles operate on a charge-and-run model. Some high-power underground machines — particularly continuous miners and high-output development equipment — draw power continuously via a trailing cable rather than relying on an onboard battery for the full operating cycle. For these machines, the trailing cable carries the full drive load current, which is substantially higher than the control-only currents of the diesel era.

The implications for the trailing cable handling system are significant:

• Drum capacity must accommodate heavier cable over the same travel distances — this often requires a larger drum diameter and a more powerful drive motor
• Slip ring ratings must match the higher continuous current — a slip ring assembly rated for 200A is not adequate for a machine drawing 800A continuous
• Cable bending radius management becomes more critical — larger, heavier cables have larger minimum bending radii, and repeated violation of these radii during drum storage accelerates insulation fatigue
• Connector ratings for the machine-end cable termination must be specified for the full load current with appropriate derating for the underground thermal environment

EV Cable Trailer Delivery: Fortescue, Pilbara WA

In early 2026, Redmond Gary delivered a purpose-built 3.5-tonne EV cable trailer to Fortescue’s Pilbara iron ore operations — one of the first bespoke EV cable management systems to enter service on an Australian hard rock mine site. The system was engineered from the ground up for the cable weights, current ratings, and connection cycle demands of Fortescue’s battery-electric underground vehicle fleet. Unlike adapted diesel-era systems, this trailer was designed specifically for the connection frequency and cable weights of EV operation — a direct response to the limitations mine operators had already encountered trying to use legacy cable management equipment with new generation electric machines.

Planning Underground Charging Infrastructure: The Cable Management Perspective

When mining operations teams plan underground fast-charging infrastructure, the focus typically falls on the electrical engineering side: transformer capacity, cable sizing to the charge bay, protection coordination, and the charging equipment itself. The cable management at the charge bay — how the charging cable is stored, protected, and presented to the vehicle — is often treated as a detail to be resolved during commissioning.

In practice, poorly planned charge bay cable management creates operational friction that compounds over thousands of charging cycles. Common problems that emerge on poorly planned sites include:

• Charging cables left coiled on the roadway floor between charges, accumulating damage from pedestrian and vehicle traffic
• Cable connectors damaged by repeated dragging across the mine floor as operators manage heavy cables manually
• Inadequate cable storage causing tangling and kinking, reducing cable service life and increasing replacement frequency
• Heat accumulation in tightly coiled high-current charging cables, accelerating insulation degradation

Purpose-built cable management at each charging bay — retractable cable systems, managed cable storage, and connector protection — addresses all of these issues and pays for itself rapidly through reduced cable replacement costs and minimised charging delays.

What to Consider When Procuring Cable Management for EV Mining Equipment

If your mine is planning or already executing an EV transition, these are the cable management procurement questions to work through before machines arrive on site:

• What is the maximum charging current for each vehicle type? This determines the minimum cable and connector ratings for every handling system in the mine
• What is the expected connection cycle frequency? Opportunity charging means connectors and handling systems see far more cycles per shift than traditional trailing cable applications
• What are the cable dimensions and weights at the required current ratings? Heavier cables require re-evaluation of drum capacity, spindle loads, and drive motor sizing in all handling systems
• Where are charging bays located and what is the roadway profile? Cable management systems at charge bays must fit within the mine’s roadway clearance envelope
• Has the supplier designed and built systems for EV mining applications before? Adapted diesel-era systems may work — but systems purpose-engineered for EV cable weights and charging dynamics will perform better and last longer

The mines commissioning battery-electric fleets today are building the operational knowledge base that the rest of the industry will follow. The cable management decisions made during the first wave of EV deployments will shape procurement standards for Australian underground mining for the next decade. Getting the specification right from the start — rather than adapting legacy equipment — is the operationally and commercially sound path.

Frequently Asked Questions

Which Australian mines are leading the transition to electric vehicles?

Fortescue is among the most publicly committed, with a target of net-zero Scope 1 and 2 emissions by 2030 and an active program to electrify its underground fleet. BHP has EV trials underway at multiple sites including Olympic Dam in South Australia. Newmont’s Tanami gold mine in the Northern Territory has one of the most advanced underground EV programs in Australia. South32 and IGO have also committed to electrification roadmaps. The Goldfields region of WA and the Hunter Valley coal sector are watching hard rock electrification closely, with underground coal EV applications at an earlier stage of development due to the explosion risk classification requirements for equipment in gassy environments.

Can existing trailing cable handling systems be upgraded for EV use?

In some cases, yes — but it depends entirely on the existing system’s specifications relative to the new EV cable requirements. If the current system was designed for a lower-current trailing cable and the EV application requires substantially higher current ratings, the drum, slip ring, and drive motor may all require replacement, at which point the cost of upgrading versus purchasing a purpose-built system needs to be evaluated. The mechanical structure of a well-engineered legacy system may be reusable; the electrical components almost certainly will not be. A supplier with EV cable management experience can assess existing systems and advise honestly on whether an upgrade path is viable.

What is opportunity charging and why does it matter for cable management?

Opportunity charging is the practice of connecting an electric vehicle to a charging point during natural operational pauses — during loading cycles, at shift change, or during maintenance windows — rather than returning to a dedicated charging bay only when the battery is depleted. Most battery-electric mining OEMs design their vehicles and charging systems around opportunity charging because it allows a smaller onboard battery (reducing vehicle weight and cost) while maintaining operational availability across a full shift. From a cable management perspective, opportunity charging means dramatically more connect/disconnect cycles per day than end-of-shift-only charging. Cable connectors, handling reels, and cable storage systems must be specified for high-cycle operation — typically defined as thousands of cycles per year rather than the hundreds that diesel-era systems experienced.

How does underground EV charging affect ventilation planning?

Eliminating diesel combustion underground significantly reduces the ventilation requirement for the working areas — diesel particulate and NOx removal is a primary driver of ventilation airflow in conventional underground mines. This is one of the most compelling financial arguments for EV transition: ventilation is one of the largest operating costs in an underground mine, and reducing the ventilation requirement can save tens of millions of dollars per year at a large operation. However, battery charging does introduce localised heat generation, and the electrical infrastructure to support charging adds heat load from transformer and cable losses. Ventilation planning for an electrified mine is different from diesel ventilation design — not necessarily more difficult, but it requires updated thermal modelling that accounts for the changed heat sources.

Purpose-built cable management for electric mining vehicles.

Redmond Gary has already delivered EV cable management systems to Australian mine sites — including the Fortescue Pilbara EV cable trailer commissioned in early 2026.