For large gas consumers in Australia, securing a competitive and reliable gas supply involves far more complexity than simply accepting a retailerโs offer. The structure of the Australian gas market, the variety of contract types, and recent regulatory changes all directly influence costs, risk exposure, and operational certainty. This article outlines the key factors that must be considered when procuring gas โ and highlights why expert negotiation is essential in todayโs market.
How Gas Supply Works in Australia
Australiaโs east coast gas market is interconnected by major transmission pipelines, sourcing gas primarily from the SuratโBowen Basin in Queensland, with smaller volumes from South Australia, Victoria, New South Wales, and the Northern Territory. Gas flows from production basins to Liquefied Natural Gas (LNG) export terminals, large industrial users, and major population centres.
Two main markets operate side-by-side:
- Contract market โ Around 90% (citing ACCC data) of east coast gas is sold under bilateral contracts between gas producers (or wholesalers) and large buyers.
- Spot market โ The remainder is traded through short-term wholesale markets such as the Declared Wholesale Gas Market (Victoria), Short Term Trading Market (Sydney, Adelaide, Brisbane), and Gas Supply Hubs (Wallumbilla, Moomba).
For large gas users, long-term contracting is the standard approach โ not only to secure supply certainty but also to shield against spot market volatility, where prices can swing sharply due to weather patterns, electricity market demand, or LNG export schedules.
AERโs Role in the Wholesale Gas Market
The Australian Energy Regulator (AER) oversees the entire gas supply chain in eastern Australia. At the wholesale level, it monitors spot gas markets in major cities (Sydney, Brisbane, Adelaide, and Victoria), key gas supply hubs (Wallumbilla, and Moomba), short-term secondary capacity markets, and the Gas Bulletin Board platform.
The AER ensures compliance with the National Gas Law and Rules, taking enforcement action when needed. It publishes reports on gas market activity, prices, and liquidity. Additionally, the AER regulates transmission and distribution pipelines and retail markets in eastern Australia. AER have no regulatory function in Western Australia, where separate laws apply. The Economic Regulation Authority is the economic regulator for gas markets and pipelines in Western Australia and AEMO operates a spot (retail) gas market there.
Large vs Small Customer Rules
Under Australian energy laws, Small and Large Customers are defined as follows.
- Small Customers โ Use less than one (1) terajoule (TJ) of gas per year, typically households and small businesses. They are protected under the National Energy Customer Framework (NECF) and can access regulated Standard Retail Contracts.
- Large Customers โ Use more than 1 TJ per year (typical for manufacturers, processing plants, and major commercial facilities). They are not protected by the NECF and are subject to the commercial terms and conditions negotiated directly with retailers or producers under bilateral contracts.
Large gas customers often have greater contractual flexibility โ but also carry greater responsibility for negotiating favourable terms.
Bilateral Gas Contracts โ Core Features for Large Users
For large commercial and industrial (C&I) customers in Australia, gas is predominantly procured under bilateral contracts negotiated directly with a retailer or producer. These agreements are private, bespoke, and can vary widely, but typically include the following key provisions:
- Contract Term. Typically 1โ5 years, with strategic arrangements extending to 10+ years where long-term supply security is required.
- Contracted Volume. Normally stated in petajoules (PJ) or terajoules (TJ) per year, with a take-or-pay obligation requiring the buyer to pay for an agreed minimum volume even if it is not consumed.
- Pricing Structure. Gas contracts for C&I customers in Australia generally follow one of three pricing models:
- Fixed Price: Under a fixed price arrangement, a set $/GJ rate applies for the entire contract term, providing budget certainty by shielding the buyer from wholesale market fluctuations. While the base rate remains constant, the contract may include an agreed annual escalation โ often linked to CPI โ to account for inflation.
- Spot Pass Through: A pass-through gas contract reflects actual market cost; such as spot prices, transport, and environmental charges, without bundling them into a fixed rate. This structure is usually available to large gas market participants, with retailers often setting a minimum threshold, commonly 50 terajoules (TJ) per year, due to the complexity of managing such contracts.
- Hybrid: This solution combines fixed and pass-through pricing, letting businesses benefit from wholesale gas prices while keeping some price certainty. Retailers usually offer this to large customers, often requiring a minimum usage; for example, around 150 terajoules per year. It gives flexibility to split your gas between fixed and market-linked prices depending on how much risk you want to take.
- Delivery Point. The physical location where title and risk pass to the buyer (e.g. pipeline injection point, hub, or facility gate).
- Transport Arrangements. Specifies whether pipeline capacity is bundled with the gas supply or contracted separately from a pipeline operator.
- Flexibility Provisions. Defines permitted variation in daily or annual quantities, including swing rights or tolerance bands.
- Billing and Settlement. Details invoicing frequency, payment terms, and reconciliation procedures for over- or under-deliveries.
- Force Majeure and Curtailment. Sets out events that excuse performance and the process for notification, mitigation, and resumption of supply.
- Contract Expiry/Extension. Outlines renewal rights, rollover provisions, or reversion to default market supply upon expiry.
A clear understanding of these contractual components โ particularly the pricing methodology and its indexation mechanics โ is crucial for securing a competitive and reliable gas supply that aligns with a businessโs operational and financial requirements.
Why Professional Tendering and Negotiation Matter
Gas contracting for large C&I users is not simply about finding the โlowest price.โ Key considerations include:
- Volume flexibility โ Avoiding penalties for over/under-consumption
- Price structure โ Balancing fixed vs indexed pricing to manage risk
- Transport optimisation โ Minimising pipeline tariffs through strategic sourcing
- Contract timing โ Securing terms before seasonal or market-driven price increases
- Regulatory compliance โ Ensuring contracts align with the latest gas market rules and codes
At NUS Consulting Group, we run competitive tenders across multiple retailers and producers, ensuring:
- Transparent comparison of delivered gas costs (including transport and fees)
- Negotiation of flexible terms suited to your operations
- Risk mitigation strategies that protect you from market volatility
For large C&I gas users, the Australian gas market offers opportunities to secure reliable, cost-effective supply โ but only with a comprehensive strategy and strong negotiation. Understanding the interplay of wholesale prices, pipeline tariffs, contract structures, and market regulation is essential to maximising value.
By leveraging expert tendering and contract management, your business can lock in competitive rates, manage risk, and ensure energy certainty in a complex and rapidly evolving market.
For more information contact your NUS consultant, or contact us online