Do Oil Prices Affect Electricity Prices in Australia?

Petrol prices jump at the servo, crude-oil headlines dominate the news, and you start wondering whether your next power bill will climb too. It is a fair question, but the way oil prices affect electricity prices in Australia is more indirect than in countries that rely heavily on oil-fired generation.

In electricity statistics, “oil” generally refers to petroleum products such as diesel or fuel oil used for generation, rather than crude oil being burned directly in power stations. Most Australian electricity comes from coal, natural gas and renewable sources, so wholesale electricity prices respond primarily to conditions within the electricity market rather than daily movements in crude benchmarks. Oil can still influence electricity costs through gas contracts, remote diesel generation, transport, supply-chain expenses and inflation, but any effect on household bills usually arrives later and is mixed with other cost movements.

Do Oil Prices Directly Set Australian Electricity Prices?

No. Oil products make up only a small part of Australia’s national generation mix, and the major electricity markets determine dispatch and pricing through generator offers, demand and system constraints. Oil’s influence is therefore mostly indirect, except in systems that rely materially on diesel or other liquid fuels for generation.

Oil’s Small Share of Electricity Generation

According to the Australian Energy Statistics 2025 fuel-mix data, oil products supplied only about 1.6% of Australian electricity generation in calendar 2025, compared with 42.7% from coal, 16.2% from natural gas and 39.6% from renewables. Oil’s share was even smaller in NSW and Victoria, but higher in Western Australia and the Northern Territory. With such a small national role, a swing in crude prices cannot directly reprice most Australian generation.

Generation, Demand and Network Constraints in the NEM

In the National Electricity Market (NEM), AEMO determines dispatch and regional pricing through generator offers, subject to demand and system constraints, in each five-minute dispatch interval. Plant availability, renewable output, transmission limits and interconnector conditions all influence the outcome. Gas-fired generators can contribute to high prices during tight periods, even though gas supplies a smaller share of annual generation. Retail bills then incorporate wholesale energy costs alongside network charges, environmental costs, retail costs and margins. Electricity price trends can therefore look very different from movements in Brent or WTI crude prices.

Western Australia’s Different Market Structure

Western Australia isn't part of the NEM. The South West Interconnected System runs through the Wholesale Electricity Market, while other parts of the state have regional and isolated networks with their own fuel mixes and pricing. WA also uses far more gas than the eastern states, and some remote systems rely on diesel. Oil-price exposure can be more visible in particular locations. Even so, retail tariffs depend on local regulation, contracts, generation costs and network arrangements, not on crude oil alone.

How Can Oil Prices Affect Electricity Costs Indirectly?

The oil price impact in Australia can flow through to electricity via other fuels and business costs, even where oil-fired generation is minor. How strong and how quick that effect is depends on contract design, the regional fuel mix and whether higher input costs are big enough to shift wholesale or regulated retail prices.

Oil-Linked Gas and LNG Contracts

Some long-term gas and LNG contracts in the Asia-Pacific use formulas linked to oil benchmarks, so a sustained oil-price move can change the value of gas under those contracts. Australian domestic gas prices aren't a simple oil formula, but east-coast gas markets interact with LNG export economics and contract portfolios. If gas costs rise, gas-fired generators may bid higher, which matters when they're needed to meet demand or set the marginal price.

No Fixed Gas-to-Electricity Price Link

There's no fixed link between gas and electricity prices, though. Coal, wind, solar, hydro, batteries, outages and interconnectors all affect which plant sets the price. When renewables and batteries cover more of a peak, gas has less influence, even if its fuel cost is high.

Fuel, Freight and Service Costs

Higher oil prices push up diesel and transport costs. That adds to the cost of moving crews, spare parts, transformers, poles and other equipment. Networks and generators also rely on contractors and service fleets, so fuel is one input to maintenance and construction. These costs are usually small compared with the whole bill, and they may be recovered over longer regulatory or commercial periods. The result is gradual cost pressure, not a surcharge that moves every time petrol or crude prices change.

Inflation and Delayed Tariff Changes

A large, persistent oil shock can feed into broader inflation by raising transport and production costs across the economy. Inflation then affects the labour, equipment, financing and operating costs used in network determinations and retail cost allowances. That takes time. Regulated default offers are reset on scheduled cycles using many cost inputs, while market offers change under retailer contracts and notification rules. So if your power bill goes up in 2026, you can't pin it on the oil price on any single day.

When Can Oil-Price Effects Matter More in Australian Power Systems?

Oil-related effects grow when a power system relies more on gas priced against international markets, when diesel supplies an isolated network, or when a region has few alternative generators. Exposure varies sharply across Australia.

Gas Generation During Price-Setting Periods

Oil-price effects can matter more when higher gas costs flow into gas-generator bids during tight periods, such as high demand, low renewable output, outages and transmission constraints. What counts is which plant sets the marginal price. A small amount of expensive gas generation can lift spot prices for a while without creating a lasting link between oil and retail electricity.

Diesel Costs in Isolated Systems

Remote and isolated power systems can be more directly exposed to oil prices because diesel may provide a meaningful share of generation. Oil products supplied 9.9% of Northern Territory generation in 2025. In diesel-dependent systems, fuel and delivery costs can materially affect generation economics, although subsidies, regulated tariffs and long-term contracts may prevent the full change from appearing immediately on customer bills.

For smaller off-grid loads, solar generator kits can generate and store electricity without consuming diesel during operation, potentially reducing the amount of time a fuel-powered generator needs to run when solar conditions and system sizing are suitable. They should not be treated as replacements for the larger generation and network infrastructure used by remote communities.

Regional Fuel Mix and Contract Differences

Regional exposure depends on the fuel mix and contract structure. The Australian Energy Statistics state and territory fuel-mix data shows that gas supplied 57.4% of Western Australian generation and 81.4% of Northern Territory generation in 2025, compared with 3.3% in NSW and 3.0% in Victoria. That does not create a fixed oil-to-electricity price link, but it helps explain why the same global fuel shock can affect regions differently. Contract terms, renewable output, network constraints and regulatory arrangements determine how much of the change ultimately reaches electricity customers.

Conclusion

Oil prices can affect electricity prices in Australia, but the relationship is mostly indirect. Since oil accounts for only a small share of national electricity generation, wholesale prices depend more heavily on electricity demand, generator bids, gas costs, renewable output, and network constraints. Oil-price changes can influence electricity costs through gas and LNG contracts, diesel generation, transport expenses, and inflation. These effects are generally more pronounced in diesel-dependent remote systems, while their impact on household bills depends on regional fuel mixes, contracts, and retail pricing arrangements.