Every major Australian miner now has a decarbonisation roadmap. Most of those roadmaps depend heavily on electrification—replacing diesel haul trucks, converting heating systems, switching to electric processing equipment. The ambition is real. But there’s a problem that doesn’t get enough attention in the glossy sustainability reports: where’s all the electricity going to come from?

The Scale of the Power Gap

A typical Pilbara iron ore operation running diesel haul trucks consumes somewhere between 50 and 80 million litres of diesel per year. Converting that fleet to battery-electric trucks doesn’t eliminate the energy demand—it shifts it to the electrical grid. And the numbers are sobering.

A single Cat 798 AC electric haul truck with a battery pack needs roughly 2-3 MWh per shift to maintain operational readiness. Multiply that across a fleet of 40-60 trucks, add charging infrastructure losses, and you’re looking at an additional 200-400 MW of generation capacity needed per operation.

For context, most remote mine sites currently operate on 50-100 MW of installed generation capacity. We’re talking about tripling or quadrupling power requirements.

What’s Actually Happening on the Ground

Several approaches are being tested across Australian operations:

Hybrid renewable microgrids. Fortescue’s Pilbara operations have been building solar-gas hybrid systems, with the Pilbara Generation project aiming to supply 100% renewable electricity to its Chichester Hub. It’s ambitious, and the solar resource in the Pilbara is excellent, but intermittency management at mining-scale loads remains challenging.

Behind-the-meter solar. Dozens of smaller operations have installed solar farms to offset daytime grid consumption. Gold Fields’ Agnew mine in Western Australia runs a hybrid system combining wind, solar, and battery storage with gas backup. It’s been operational since 2020 and provides a useful reference case, but Agnew’s total power demand is modest compared to a large iron ore operation.

Grid connection upgrades. Some Queensland coal and mineral sand operations are investing in upgraded grid connections to draw more power from the NEM. It works where grid infrastructure exists, but many Australian mines are hundreds of kilometres from the nearest substation.

The Charging Infrastructure Challenge

Even if you solve the generation problem, charging logistics create their own headaches. Battery-electric haul trucks need fast charging—either opportunity charging during load-dump cycles or battery swap systems at designated stations.

Both approaches require substantial on-site infrastructure:

• High-voltage distribution networks throughout the pit
• Charging pads or swap stations positioned to minimise cycle time impacts
• Redundancy in charging systems to prevent fleet-wide downtime from a single failure
• Dust and heat protection for sensitive charging electronics

The civil works alone represent hundreds of millions in capital for a large operation. And these systems need to be mobile—mine pits move. Your charging infrastructure needs to move with them, or you accept increasing truck cycle times as the active mining face retreats from fixed charging points.

Where the Industry Is Turning for Answers

The honest answer is that nobody has a complete solution yet. What’s emerging is a recognition that mine site electrification isn’t just an equipment procurement exercise—it’s a systems integration challenge that spans generation, distribution, storage, and operational scheduling.

Some operators are working with technology firms like team400.ai to model the interaction between fleet scheduling, charging demand, renewable generation profiles, and battery degradation. Getting the scheduling layer right can reduce peak power demand by 15-20%, which directly shrinks the generation infrastructure needed.

Others are looking at hydrogen as a bridging fuel for haul trucks, avoiding the grid problem entirely. But hydrogen production, storage, and refuelling infrastructure introduces its own set of challenges—and the energy efficiency losses in the hydrogen pathway mean you need even more renewable generation than direct electrification.

The Realistic Timeline

Here’s what I think the industry needs to accept: full electrification of large-scale open pit mining in Australia is a 15-20 year project, not a 5-10 year one. The technology for electric trucks and loaders exists or is close to commercial readiness. The energy infrastructure doesn’t.

That doesn’t mean nothing should happen in the meantime. The immediate wins are in:

• Electrifying ancillary equipment (light vehicles, water carts, service trucks) where charging demand is manageable
• Building renewable generation capacity now, even if it initially displaces gas rather than diesel
• Designing new mine plans with electrification infrastructure corridors built in from day one
• Investing in grid studies and power system modelling to understand the true scale of the infrastructure gap

The mines that start planning their electrical infrastructure now—not just their equipment replacement schedules—will be the ones that successfully transition. Everyone else will find themselves with electric trucks and nowhere to plug them in.

The decarbonisation ambition is right. The execution planning needs to catch up.