- 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 Melbourne plant, and one of the least watched. An audit tells you what your system really costs to run, where the energy leaks away, and what each fix is worth. In Victoria the upgrades it finds can be pushed through the Victorian Energy Upgrades program on its project-based pathway, which can offset part of the capital cost. CAS connects you with an independent auditor; we don’t run the audit ourselves.
This page covers what a compressed air audit involves in Melbourne, how Victorian Energy Upgrades applies to compressed air, what the audit costs, and how to choose an independent auditor. It is written for plant managers, facilities engineers, and operations teams across Melbourne’s manufacturing belt.
The Melbourne specifics live on this page. The national picture, what an ISO 11011 audit involves, what it costs, and how to pick an independent auditor, is covered in the compressed air audit Australia guide.
Why Melbourne operators audit compressed air
Melbourne carries one of the largest concentrations of manufacturing in the country, and compressed air runs through most of it: food and beverage, plastics, packaging, fabrication, and pharmaceuticals all depend on it. 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), that electricity is the dominant lifetime cost of any compressor. A poorly maintained system can lose 20 to 30 per cent of its output through 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 hidden waste into a ranked, costed plan.
Compressed air audit: Melbourne
What an audit is chasing in Melbourne
The numbers behind the business case, and the Victorian 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).
Victorian Energy Upgrades is active and certificate-based, but compressed air is not one of the program’s standard deemed activities.
Projects go through the project-based activities pathway: measurement and verification credits the actual energy saved, so metered audit data is the evidence base.
Method: ISO 11011 Compressed air Energy efficiency Assessment: supply-side measurement, demand-side measurement, quantification of losses.
Source: CAS compressed air audit Melbourne 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 (leaks, artificial demand, inappropriate uses). For the full seven-step breakdown and the contents of a good audit report, see the national compressed air energy audit guide. This page focuses on the Melbourne funding and sourcing picture.
Victorian Energy Upgrades and compressed air
Victoria runs the Victorian Energy Upgrades program for businesses, which is active and certificate-based. Compressed air is worth understanding carefully here, because it is not one of the program’s standard deemed activities. Instead, a compressed air efficiency project is generally pursued through the program’s project-based activities pathway, which uses a measurement and verification method to credit the actual energy saved on a custom project. That makes a properly metered audit even more valuable in Victoria than elsewhere: the same data-logging that quantifies your saving also forms the evidence base a project-based application relies on. Confirm current eligibility and the applicable method with an accredited provider, since program activities and specifications are revised periodically.
What a Melbourne 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 across a large plant. The economics turn on what the audit finds rather than the fee. 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, independent of any Victorian Energy Upgrades credit on the upgrades themselves. A good report ranks each measure by cost, annual saving, and payback, so you can fund the quick wins from the savings and stage the capital items. Size the leak-repair opportunity yourself first with the CAS leak cost calculator.
How to choose a compressed air auditor in Melbourne
Independence matters most. 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. If you intend to pursue a Victorian Energy Upgrades project-based application, confirm the auditor can produce measurement and verification evidence to the standard the program requires.
CAS is an information and referral service. We do not conduct audits or sell compressors. Tell us your site location in Melbourne, 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 Melbourne audit
Gather three numbers before you commission anything: your compressor’s rated power, your typical operating pressure, and your annual run hours. Those let an auditor estimate your annual compressed air electricity cost and likely recovery. Then choose between a fast leak survey for an immediate return and a full ISO 11011 assessment that also feeds a Victorian Energy Upgrades project case. 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, Brisbane, and Perth.
Frequently asked questions
Does Victorian Energy Upgrades cover compressed air in Melbourne?
Compressed air is not one of the Victorian Energy Upgrades program’s standard deemed activities, but a compressed air efficiency project can generally be pursued through the program’s project-based activities pathway, which credits the actual energy saved using a measurement and verification method. A properly metered audit provides the evidence base such an application relies on. Confirm the current pathway and method with an accredited provider.
What does a compressed air audit cost in Melbourne?
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, before any Victorian Energy Upgrades credit on the upgrades. Ask for each measure ranked by cost, annual saving, and payback.
How much can a compressed air audit save a Melbourne factory?
Poorly maintained systems can lose 20 to 30 per cent of compressed-air output through leaks, plus losses from over-pressurisation and poor control. At roughly $0.30/kWh for a typical commercial and industrial tariff, recovering even half of that on a mid-sized compressor runs into thousands of dollars a year. The precise figure depends on your compressor size, pressure, and run hours, which the audit measures.
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 I check before hiring a compressed air auditor in Melbourne?
Check that the auditor is independent of any equipment sale, follows the ISO 11011 methodology, data-logs over a representative period, and reports each measure in kWh and dollars with a payback. If you plan to pursue a Victorian Energy Upgrades project-based application, confirm the auditor can produce measurement and verification evidence to the required standard.