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Alcoa announced on August 19 a binding conditional gas sales agreement with Equus Energy for its Pinjarra and Wagerup alumina refineries in Western Australia. The disclosed prospective supply is approximately 50 terajoules per day over a ten-year term. The project targets supply in the early-to-mid-2030s, subject to regulatory approvals and a final investment decision. A conditional agreement is therefore a procurement commitment linked to development, not gas already delivered to the refineries.
The timing is central to the economics. Refinery heat requirements continue while a future gas project moves through engineering, approval, funding and construction. A long-term offtake can help define a customer base for the developer and future sourcing for the buyer, but it does not itself close the gap between today’s consumption and future delivery. The public announcement does not disclose the sales price, detailed escalation formula or an unconditional commissioning date.
Terajoules measure energy rather than a simple physical volume of gas. Converting the contracted energy to cubic metres requires a stated heating-value basis and reference conditions. Comparing the agreement with a refinery’s needs would additionally require consumption measured on the same energy basis. Neither a volume conversion nor a coverage percentage should be guessed. The figure also cannot be divided by an invented alumina output denominator to manufacture an observed unit production cost.
For procurement teams, the relevant questions concern conditionality, delivery milestones and the residual supply portfolio. The review should distinguish the seller’s project risk from the buyer’s operating exposure, and identify how existing gas arrangements cover the period before the new source starts. Backup fuel can have different handling, operating and emissions implications, so substitution requires engineering evidence rather than a price-only comparison. The August disclosure establishes a future supply pathway with explicit dependencies. It supports analysis of refinery energy continuity and development timing, while leaving the tariff and actual cost consequences unresolved. As of October 9, those boundaries are more useful than presenting a long agreement as a measured saving: buyers still need contract terms, reliable start-up evidence and their own heat demand before calculating a delivered-energy budget.