Miners Are Burning a Lot More Diesel than Four Years Ago, Just for Same Amounts of Now Hard-to-Get Coal

Why It Matters

Higher diesel consumption inflates operating costs and threatens the competitiveness of Australia’s coal sector, while dwindling fuel subsidies and limited stockpiles expose the industry to price volatility and supply shocks.

Key Takeaways

• Diesel use up 25% more than in 2021/22 for same coal output
• Deeper open‑cut mining increases fuel consumption and operational costs
• Australia holds the lowest IEA diesel stockpile among 32 members
• Upcoming loss of 26‑cent per litre excise discount raises diesel prices
• Electrification and alternative fuels face remote‑site electricity access challenges

Pulse Analysis

The Institute for Energy Economics and Financial Analysis reports that Australian coal mines are now using a quarter more diesel than in 2021/22 to produce the same tonnage. Deeper excavations in open‑cut operations require larger volumes of overburden to be moved, directly translating into higher fuel burn. With diesel prices already inflated by global supply constraints, the extra consumption erodes profit margins and pushes unit‑costs upward across the sector. For miners, the cost‑per‑tonne of coal is climbing even as market prices remain volatile and operational efficiency pressures intensify.

Compounding the fuel squeeze, Australia holds the smallest diesel reserve among the 32 International Energy Agency members, roughly half the recommended level. The recent closure of the Strait of Hormuz has tightened global oil flows, prompting Australian policymakers to negotiate additional supply contracts and to offer a temporary 26‑cent‑per‑litre (about $0.17 USD) excise rebate, which expires at June’s end. Once the discount lapses, pump prices are expected to rise further, passing the cost burden onto mining firms and, ultimately, consumers at the fuel bowser, and could strain the broader economy.

Industry leaders point to electrification, bio‑fuels and hydrogen as long‑term pathways to curb diesel dependence, yet remote mine sites lack the robust electricity grids needed for large‑scale power swaps. Investment in on‑site renewable generation and high‑capacity transmission could unlock these alternatives, but upfront capital outlays and regulatory approvals remain significant hurdles. Until such infrastructure materialises, Australian coal producers will likely continue to shoulder rising diesel costs, pressuring profit margins and potentially accelerating a shift toward lower‑carbon export markets for both domestic and international stakeholders.