How Wesfarmers Limited (ASX:WES) Manufactures Ammonia and Ammonium Nitrate at Kwinana

Aditi Sarkar

13 October 2026 04:14 AM AEDT

How Wesfarmers Limited (ASX:WES) Manufactures Ammonia and Ammonium Nitrate at Kwinana

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Highlights

Wesfarmers operates Kwinana chemical manufacturing through its WesCEF division and CSBP business.
Ammonia production combines natural gas-derived hydrogen with nitrogen.
Ammonia is used to manufacture nitric acid and ammonium nitrate for mining customers.
CSBP supplies ammonium nitrate in prilled, solution and emulsion forms.
Plant reliability, natural gas supply and safety controls influence operating outcomes.

Wesfarmers Limited (ASX:WES) is a diversified Australian company with businesses spanning retail, industrial chemicals, energy and fertilisers. Its Wesfarmers Chemicals, Energy and Fertilisers (WesCEF) division includes CSBP, which manufactures ammonia and ammonium nitrate at Kwinana in Western Australia. The facilities supply chemical inputs used across mining, agriculture and industry. Their operations combine continuous chemical production, product handling and distribution, alongside specialised safety and environmental management.

How the Ammonia Plant Fits Into Kwinana

The Kwinana site uses natural gas, steam and air to produce ammonia. Natural gas first undergoes treatment and reforming to create hydrogen-containing synthesis gas. Subsequent processing prepares a mixture of hydrogen and nitrogen for ammonia synthesis. Refrigeration then enables liquid ammonia to be stored and transferred to customers or other facilities.

CSBP identifies its ammonia plant capacity as up to 255,000 tonnes annually, with approximately 40,000 tonnes of storage capacity. These are stated plant capabilities, not an independently established FY26 production total. For Wesfarmers Limited (ASX:WES), the plant supports both outside customers and downstream chemicals manufactured within the wider operation.

From Ammonia to Industrial Products

Ammonia is an input into nitric acid and ammonium nitrate production. CSBP operates three nitric acid and ammonium nitrate manufacturing facilities at Kwinana. The business identifies ammonium nitrate as an important input for the resources sector, particularly in mining applications. Its published product information describes manufacture of more than 800,000 tonnes annually.

CSBP supplies porous prilled ammonium nitrate, ammonium nitrate solution and ammonium nitrate emulsions. Different forms meet different customer requirements and operating environments. Wesfarmers Limited (ASX:WES) therefore manages chemical production alongside storage, distribution and product specifications. The supplied draft included precise reactor temperatures, pressures and equipment dimensions that could not be confirmed against current public operating material; those details are excluded here.

Manufacturing Reliability and Supply Arrangements

Chemical production depends on dependable feedstock, utilities, maintenance and process control. Natural gas serves as both a manufacturing input and an energy source, so its availability and price can influence production economics. Scheduled maintenance and unplanned shutdowns can affect volumes, while logistics infrastructure is needed to deliver ammonia and other chemical products safely.

The Kwinana complex has connections to road, rail, pipelines and port infrastructure. For Wesfarmers Limited (ASX:WES), these links support movements between manufacturing sites, storage areas and customers. Managing site throughput involves coordinating several production processes rather than assessing ammonia and ammonium nitrate plants as isolated assets.

Safety, Environmental Controls and Current Priorities

Ammonia and nitric acid require specialised handling and containment measures, while ammonium nitrate is subject to storage and transport controls. Equipment inspection, emergency planning, worker safety and compliance are ongoing operational requirements. Environmental management also includes emissions associated with chemical manufacturing.

In its June 2026 strategy briefing, Wesfarmers Limited (ASX:WES) identified operational excellence, gas supply strategy, decarbonisation and customer relationships among WesCEF priorities. These areas provide relevant context for Kwinana manufacturing, although the briefing does not establish specific FY26 utilisation rates for each chemical production unit.

What to Watch Next

Subsequent WesCEF disclosures can be assessed for divisional earnings, plant availability, operating costs and major project delivery. Changes in natural gas prices, demand from mining customers and environmental compliance requirements may influence outcomes. Wesfarmers Limited (ASX:WES) also operates multiple other businesses, so divisional results should not be interpreted as Kwinana plant results alone.

Key Insights

Kwinana links ammonia synthesis to nitric acid and ammonium nitrate manufacturing, product storage and industrial distribution. For Wesfarmers Limited (ASX:WES), the chemicals operation depends on reliable feedstock, equipment and compliance systems. Official capacity figures describe operating scale but do not by themselves establish actual production or profitability in a particular reporting period.

FAQs

Q: What is Wesfarmers’ ASX code?

A:Wesfarmers trades as ASX:WES.

Q: Which Wesfarmers business operates at Kwinana?

A:CSBP operates within the WesCEF division.

Q: What is ammonia used for at the site?

A:It supplies external customers and serves as an input to ammonium nitrate and other products.

Q: What forms of ammonium nitrate does CSBP supply?

A:Prilled material, solution and emulsion products.

Q: What factors affect chemical plant performance?

A:Feedstock availability, equipment reliability, safety and customer demand.

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