Compressed Air Audit Australia

Author
Byron Raal, CAS Founder-Editor About the author
Checked against
ISO 11011
Date last checked
22 August 2026

A compressed air audit measures system pressure, flow, leakage and energy draw against ISO 11011 methodology and quantifies the energy and dollar savings available from leak repair, pressure-setpoint reduction and VSD compressor retrofit. For Australian commercial-industrial facilities at $0.30/kWh, a first audit of a poorly maintained system can recover 20 to 35 per cent of total compressed-air energy spend, with the full package of measures paying back within 12 to 24 months in some cases. Several government schemes part-fund exactly this work: see the grants and incentives map.

Compressed air is one of the largest electricity costs in any Australian manufacturing, food, beverage or pharmaceutical plant, 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 in dollars per year. CAS connects you with an independent auditor who follows the ISO 11011 methodology and does not also sell compressors; we publish and refer, we do not run the audit ourselves.

This page covers what a compressed air audit involves under ISO 11011, the energy-efficiency funding landscape across Australian states, what audits cost and what they return, where CAS-referred auditors deliver, and how to choose an independent provider. It is written for plant managers, facilities engineers, procurement leads and operations teams.

90 day compressed air energy plan: baseline audit, leak repair, pressure right-sizing, heat recovery, then ongoing monitoring; most sites bank 20 to 50 per cent energy savings.
Figure 1 A 90 day compressed air energy plan: baseline audit, leak repair, pressure right-sizing, heat recovery, then ongoing monitoring. Most sites bank 20 to 50 per cent energy savings (US DOE Sourcebook). Illustrative.
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Why Australian operators audit compressed air

Generating compressed air costs roughly 6 to 7 kW per cubic metre per minute of free air delivered, and at approximately $0.30/kWh based on a typical commercial and industrial tariff for the 2025-26 financial year (actual rates vary by state, retailer, and contract), the running cost over a ten-year operating life dwarfs the purchase price of the compressor. Unaudited Australian systems routinely lose 20 to 30 per cent of compressor output (FAD) to leaks alone, with additional losses from over-pressurisation, poor control, and undersized or failing dryers. A single 3 mm leak at 7 bar bleeds about 7.31 L/s (439 L/min) of free air delivery (FAD) per ISO 6358 choked-orifice mechanics. Across a mid-sized rotary screw fleet, that pattern can represent five and six-figure annual electricity losses that an audit converts into a costed action list.

An audit follows the methodology standardised in ISO 11011 Compressed air Energy efficiency Assessment. For the full seven-step breakdown and a deliverables checklist for the audit report, see the compressed air energy audit guide.

Macro photograph of a brass threaded fitting on a blue aluminium compressed air distribution pipe showing the thread junction where leaks typically develop

The funding landscape across Australian states

State-level energy-efficiency support for compressed air upgrades varies substantially across Australia, and the audit case should rest on the electricity it recovers rather than on a grant.

  • New South Wales: the Energy Savings Scheme is an ongoing certificate-based scheme that monetises energy savings via Energy Savings Certificates (ESCs). Compressed air upgrades that pass the scheme’s methodology can generate certificates.
  • Victoria: the Victorian Energy Upgrades programme operates a similar certificate market via Victorian Energy Efficiency Certificates (VEECs).
  • ACT and South Australia: the ACT Energy Efficiency Improvement Scheme and the SA Retailer Energy Productivity Scheme are ongoing retailer obligation schemes, not time-limited rebate rounds; eligibility varies by activity and retailer.
  • Queensland, Western Australia, Tasmania and NT: support has tended to run as time-limited rebate rounds rather than ongoing certificate-based schemes. Check what is currently open before assuming a state programme applies; the federal energy.gov.au grants and funding listing is the consolidated reference.

Programmes change, eligibility rules are technical, and certificate values shift with market conditions. The reliable case for an audit is the electricity it recovers; any state-level certificate or rebate is upside.

Compressed air audit guides by city

The audit method does not change between states, but the incentives, tariffs, and regulator details do. If your site sits in one of the five largest markets, the city guide covers the local specifics:

What an 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 with branch flow metering. The economics are driven by what the audit finds. On a system carrying 20 to 30 per cent leak losses plus over-pressurisation, recovered electricity can pay back the audit fee within the first year, sometimes more than once over. A good report ranks each recommended measure by capital cost, annual saving and payback period, so quick wins fund themselves from year-one savings and larger items can be staged. Size the leak-repair opportunity yourself before commissioning anything with the CAS leak cost calculator.

Closed dark blue ring-bound compressed air audit report folder with yellow hard hat, safety glasses, ballpoint pen, rolled pipe schematic and tape measure on an industrial desk

Where CAS-referred auditors deliver

For an audit enquiry, describe your site, compressor system and what you want measured. 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. The following location guides explain issues to consider; a guide does not establish current provider coverage:

  • Sydney and regional NSW: Greater Sydney, Newcastle, the Hunter, the Illawarra, Central Coast, Orange and Dubbo industrial corridors.
  • Melbourne and regional Victoria: Greater Melbourne, Geelong, Ballarat, Bendigo, the Goulburn Valley and Gippsland.
  • Brisbane and South East Queensland: Greater Brisbane, the Gold Coast, the Sunshine Coast, Ipswich and Toowoomba.
  • Perth and regional WA: Greater Perth, Mandurah, Kwinana industrial strip and Bunbury.
  • Adelaide and regional SA: Greater Adelaide, the Northern Adelaide manufacturing belt, Whyalla and Port Adelaide.

For sites outside these regions, including regional Queensland, Tasmania and the Northern Territory, describe your location through the form below and we will route the enquiry to a provider with the right geographic reach.

How to choose an independent compressed air auditor

Independence is the first test. An auditor who also sells compressors has a structural reason to recommend new plant over cheaper control fixes and leak repair, so a credible audit comes from someone whose recommendation is not tied to an equipment sale. Ask three questions before commissioning: does the work follow the ISO 11011 methodology end-to-end; does the auditor data-log over a representative production period rather than rely on spot readings; and does the report quantify each measure in kWh and dollars with stated assumptions (load factor, tariff, hours). For sites with significant moisture load or low-dew-point processes, also confirm the audit assesses dryer performance and condensate management, not just leaks. If a vendor has offered you a free assessment, read our guide to what free compressed air assessments really cost you before you book it.

CAS is an information and referral service. We do not conduct audits or sell compressors. Tell us your site location, 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 audit

Gather three numbers before you commission anything: your compressor’s rated motor power, your typical operating pressure, and your annual run hours. Those let an auditor estimate your annual compressed air electricity cost and the likely recovery from common measures. Then decide between a fast compressed air leak detection survey for an immediate return, and a full ISO 11011 assessment that also covers dryer and control performance. Either way, the audit can pay for itself within 12 to 24 months from the waste it surfaces, with or without a state certificate or rebate.

Describe your site, compressor system and audit objective below. 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.

Form not loading? Email us directly at byron@compressedairsolutions.com.au with your enquiry.

Related reading on CAS: the national compressed air energy audit guide, the leak cost calculator, VSD vs fixed speed compressors, compressor room design, and the compressed air systems hub.

Frequently asked questions

What does ISO 11011 require in a compressed air audit?

ISO 11011 Compressed air Energy efficiency Assessment sets the methodology for a credible audit: supply-side measurement (compressor power draw, specific power, discharge pressure), demand-side measurement (flow at branches and end-uses), and quantification of losses across leakage, pressure drop, control inefficiency and dryer performance. It also defines the report contents, including baseline energy consumption, identified measures, and projected savings with stated assumptions.

What does a compressed air audit cost in Australia?

Audit fees scale with system size and metering depth, from a single compressor-room walk-through to a multi-day data-logged study with branch flow metering. The return is driven by what the audit finds: on a system carrying 20 to 30 per cent leak losses, recovered electricity can pay back the audit fee within the first year, sometimes more than once over. Ask for each measure ranked by capital cost, annual saving and payback period.

How much can an audit save a typical Australian plant?

The US Department of Energy says leaks can sometimes waste 20 to 30 per cent of a compressor’s output (FAD); on top of that come additional losses from over-pressurisation, poor control and undersized dryers. At approximately $0.30/kWh for a typical commercial and industrial tariff, audit-driven measures across leak repair, pressure-setpoint reduction and VSD retrofit can recover 20 to 35 per cent of total compressed-air energy spend on a poorly maintained system, with the full package paying back within 12 to 24 months in some cases.

Are there government rebates for compressed air audits in Australia?

NSW operates the Energy Savings Scheme (ongoing, certificate-based via ESCs) and Victoria operates Victorian Energy Upgrades (VEECs); both can monetise eligible compressed air upgrades. The ACT Energy Efficiency Improvement Scheme and the SA Retailer Energy Productivity Scheme are also ongoing retailer obligation schemes, with eligibility varying by activity and retailer, while Queensland, Western Australia, Tasmania and NT have tended to run time-limited rebate rounds. Check the federal energy.gov.au grants and funding listing for what is currently open before commissioning. Build the audit case on the electricity it recovers; any state-level certificate or rebate is upside.

Does CAS perform the audit itself?

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.

Should an audit look at dryers and condensate, not just leaks?

Yes, particularly for sites with significant moisture load or low-dew-point processes. An undersized or failing refrigerated or desiccant dryer wastes energy and risks product quality, and condensate management failures show up as pressure drop and downstream contamination. A full ISO 11011 assessment covers dryer performance and condensate alongside leakage, control and pressure.

General information only. This page is not engineering, safety or professional advice. Read the full disclaimer.