- Author
- Byron Raal, CAS Founder-Editor About the author
- Checked against
- ISO 11011
- Date last checked
- 11 August 2026
Compressed air is one of the biggest electricity costs in a Perth operation, and one of the least measured. An audit tells you what your system really costs to run, where energy is wasted, and what each fix returns. WA doesn’t run a state energy-certificate scheme and sits on its own grid, not the eastern states’ market, so in Perth the case rests on the electricity you get back, priced against your own WA tariff. CAS connects you with an independent auditor; we don’t run the audit ourselves.
This page covers what a compressed air audit involves in Perth, the WA energy-cost context, what the audit costs, and how to choose an independent auditor. It is written for plant managers, facilities engineers, and operations teams across Perth and the WA resources and manufacturing sectors.
This guide covers the Perth and WA specifics. The national method, typical audit costs and returns, and how to choose an independent auditor are covered in the compressed air audit Australia guide.
Why Perth operators audit compressed air
Compressed air is one of the costliest utilities in a Perth operation, from food and beverage plants through to the workshops and processing facilities that support the resources sector. Generating it costs roughly 6 to 7 kW per cubic metre per minute of free air delivered. Western Australia’s South West Interconnected System is a separate electricity market from the eastern states’ National Electricity Market, with its own tariff structures through retailers such as Synergy, so price your compressed air against your actual WA bill rather than an east-coast figure; as a planning reference, commercial and industrial electricity sits in the order of $0.30/kWh for the 2025-26 financial year, but actual rates vary by state, retailer, and contract. Whatever your exact tariff, a poorly maintained system can lose 20 to 30 per cent of its output to leaks, with more lost to over-pressurisation and poor control. A single 3 mm leak at 7 bar bleeds about 7.31 L/s of free air delivery (439 L/min, modelled as a sharp-edged choked orifice with a discharge coefficient of 0.65, the same convention as our leak cost calculator). An audit converts that waste into a costed plan.
Compressed air audit: Perth
What an audit is chasing in Perth
The numbers behind the business case, and the WA conditions that shape how you price the saving.
per cubic metre per minute of free air delivered: the cost of generating compressed air
per cent of output a poorly maintained system can lose to leaks, with more lost to over-pressurisation and poor control
of free air delivery bled by a single 3 mm leak at 7 bar (439 L/min)
Planning reference tariff: $0.30/kWh for the 2025-26 financial year (actual rates vary by state, retailer, and contract).
No certificate-based state energy-efficiency scheme: the case rests on the electricity you get back, priced against your own WA tariff.
Separate South West Interconnected System: demand charges reward cutting peak compressor draw, which control and sizing measures target.
Method: ISO 11011 Compressed air Energy efficiency Assessment: supply-side measurement, demand-side measurement, quantification of losses.
Source: CAS compressed air audit Perth guide.
What a compressed air audit covers
A compressed air audit follows the methodology standardised in ISO 11011 Compressed air Energy efficiency Assessment: supply-side measurement (compressor power, specific power, pressure), demand-side measurement (flow at branches and end uses), and quantification of losses. For the full seven-step breakdown and the contents of a good report, see the national compressed air energy audit guide. This page focuses on the Perth funding and sourcing picture.
The WA energy-cost context
Western Australia does not operate a certificate-based energy-efficiency incentive scheme of the kind running in NSW and Victoria, so a Perth audit is not built around claiming a state rebate. Two WA factors shape the case instead. First, the separate South West Interconnected System means your tariff and demand charges are set in the WA market, and demand charges in particular reward cutting peak compressor draw, which is exactly what control and sizing measures in an audit target. Second, the resources sector drives much of WA’s industrial compressed air demand, often on sites where downtime is expensive and reliability matters as much as efficiency, so an audit that surfaces reliability risks (failing dryers, undersized receivers, pressure instability) earns its fee beyond the energy line alone. Check the federal energy.gov.au grants and funding listing and the broader energy.gov.au rebates directory for any current national programs, since these apply in WA even where a state scheme does not.
What a Perth audit costs and what it returns
Audit fees scale with system size and metering depth, from a single compressor-room walk-through to a multi-day data-logged study. The economics turn on what the audit finds. On a system carrying 20 to 30 per cent leak losses, the recovered electricity can repay the audit fee quickly, with the actual payback depending on the measured savings, your site’s marginal electricity cost, and the quoted audit and repair costs, and on demand-charge tariffs the saving on peak draw can add materially to that. A good report ranks each measure by cost, annual saving, and payback. Size the leak-repair opportunity yourself first with the CAS leak cost calculator.
How to choose a compressed air auditor in Perth
Independence is the first test. An auditor who also sells compressors has a reason to recommend new plant over cheaper control and leak fixes, so a credible audit comes from someone whose recommendation is not tied to an equipment sale. Ask whether the work follows the ISO 11011 methodology, whether the auditor data-logs over a representative period rather than spot-reading, and whether the report quantifies each measure in kWh and dollars against your WA tariff, including any demand-charge component. For resources-sector sites, confirm the audit also addresses reliability and air quality, not energy alone.
CAS is an information and referral service. We do not conduct audits or sell compressors. Tell us your site location in Perth, compressor size, operating conditions and audit objective. We can review your brief and discuss a suitable Australian provider if one is available. We ask for your written permission before an introduction and explain any referral payment arrangement. There is no cost to enquire.
Next step: scope your Perth audit
Gather three numbers before you commission anything: your compressor’s rated power, your typical operating pressure, and your annual run hours, and pull a recent electricity bill so the saving is priced against your real WA tariff and demand charges. Then decide between a fast leak survey for an immediate return and a full ISO 11011 assessment that also covers control, dryers, and reliability. Either way, judge the audit on the waste it measures, valued at your site’s actual electricity cost against the quoted fee.
Related reading on CAS: the national compressed air energy audit guide, the leak cost calculator, VSD vs fixed speed compressors, and the compressed air systems hub. Auditing in another city? See compressed air audits in Sydney, Melbourne, and Brisbane.
Frequently asked questions
Is there a WA rebate for compressed air upgrades in Perth?
Western Australia does not run a certificate-based state energy-efficiency scheme like the NSW Energy Savings Scheme or Victorian Energy Upgrades, so a Perth audit is not built around claiming a state rebate. Check the federal energy.gov.au grants and funding listing for any current national programs, which apply in WA. The reliable return is the electricity the audit recovers, priced against your WA tariff and demand charges.
Why does WA electricity pricing matter for a compressed air audit?
Western Australia sits on the South West Interconnected System, a separate electricity market from the eastern states, with its own tariffs and demand charges through retailers such as Synergy. Demand charges in particular reward cutting peak compressor draw, which control and sizing measures in an audit target directly. Always price the saving against your actual WA bill rather than an east-coast figure.
What does a compressed air audit cost in Perth?
Fees scale with system size and metering depth, from a single compressor-room walk-through to a multi-day data-logged study. The return is driven by what the audit finds: on a system with 20 to 30 per cent leak losses, the recovered electricity can repay the audit fee quickly, with the actual payback depending on the measured savings, your site’s marginal electricity cost, and the quoted audit and repair costs, with demand-charge savings on top. Ask for each measure ranked by cost, annual saving, and payback.
Does CAS perform the audit?
No. CAS publishes compressed air guidance and handles supplier enquiries. We do not conduct audits or sell equipment. Tell us what you need help with. If a suitable Australian provider is available, we can discuss an introduction. We ask for your written permission before sharing your details and explain any referral payment arrangement. There is no cost to enquire.
What should a resources-sector site expect from a Perth audit?
Beyond energy, a resources-sector audit should address reliability and air quality, because downtime on these sites is expensive. A good Perth audit assesses dryer performance, receiver sizing, and pressure stability alongside leaks and control, and quantifies both the energy saving and the reliability risk it removes.