Sustainability and engineering teams building an energy-reduction plan usually sort their options by cost and payback before anything else. Solar, variable-speed drives, equipment replacement, heat recovery, these all show up on the list, and all of them need capital approval, a business case, and months of lead time before a single kilowatt-hour is saved. Somewhere near the top of almost every version of that list, ahead of anything requiring a purchase order, sits compressed air leak repair.
What "low-cost, no-cost" actually means in an energy audit
Industrial energy audits typically sort recommendations into tiers by capital requirement: no-cost measures (operational changes, like turning off compressors when not needed), low-cost measures (leak repair, pressure reduction, filter replacement), and higher-capital measures (variable-speed drives, heat recovery systems, equipment replacement). Leak remediation and pressure optimisation sit consistently in that low-cost, high-return category across published industrial energy guidance, because fixing a leak doesn't require redesigning anything, it requires finding the leak and tightening or replacing one fitting.
That categorisation matters for how a project gets approved. A high-capital measure needs a business case, a budget cycle, and often a full financial year before it's greenlit. A low-cost measure can be actioned inside a maintenance budget, on a normal repair timeline, without waiting for a capital approval process at all.
Why leaks specifically outperform other low-cost measures
The scale of the opportunity is what separates compressed air from most other items on a low-cost measures list. Industry guidance commonly cites that more than half of industrial compressed air systems could achieve meaningful energy savings through low-cost improvements alone, and leaks are consistently the largest single contributor within that category. Where a lot of "quick win" recommendations save a modest, fixed amount once implemented, leak load is an ongoing drain that keeps compounding until someone actually finds and closes the leaks, which is also why it tends to be under-addressed relative to its size.
| Measure | Typical capital requirement | Typical timeframe to action |
|---|---|---|
| Leak repair | Low / no-cost | Weeks |
| Pressure optimisation | Low-cost | Weeks |
| Compressor control upgrade | Medium capital | Months, budget cycle |
| Variable-speed drive retrofit | Higher capital | Months to a year, budget cycle |
A leak repair project doesn't need a business case. It needs someone to find the leaks.
The size of the opportunity most sites don't have visibility on
The reason leak repair keeps appearing at the top of these lists is that most sites carry far more leak load than anyone realises, because leaks are inaudible over normal plant noise and don't announce themselves. A well-managed system keeps leakage under about 10% of total compressor output. An unmanaged one, which describes most sites that have never run a dedicated survey, commonly sits at 20% to 30%. That gap is pure energy waste, converted directly into an electricity bill, with no output to show for it.
Putting a number on that gap is the first step in building a credible energy-reduction case, and it's also the step most sustainability plans skip, because without a proper survey nobody actually knows how much leak load a site is carrying. It's easy to assume a site sits somewhere in the middle of the range, better than the worst case, not quite best practice, but that assumption isn't something a business case can be built on. See what a normal leak load looks like for how to tell where a site actually sits, and what compressed air leaks actually cost in Australia for turning that gap into a dollar figure a project sponsor can act on.
Why it's rarely already been done
If leak repair is such an obvious, low-cost win, the natural question is why most sites haven't already captured it. The answer is that leaks are inaudible over normal plant noise, so nothing about day-to-day operation forces them to be found. A maintenance team walking the floor will hear a leak that's whistling loudly enough to notice, but the bulk of a site's leak load sits below that threshold, in fittings, overhead runs, and connection points nobody's specifically checking. Without a dedicated survey, leak load doesn't get discovered, it just accumulates.
This is also why "we already have someone check for leaks" often understates the gap. A maintenance walk-through with soap solution or a handheld ultrasonic detector genuinely finds leaks, but only ones already suspected and reachable without a ladder. Most of a site's leak count sits outside that net, overhead mains, behind guarding, at height, which is a large part of why the 20% to 30% figure for unmanaged systems holds up across so many sites that believe they're already on top of it.
What turns the opportunity into a project
The step that actually converts "compressed air is probably wasting energy" into an approvable project is a number. A scan that locates and sizes every leak on site produces exactly that: a CFM figure and a dollar cost per leak, ranked by severity, which is the input a maintenance budget request or an energy-reduction business case actually needs. That's the difference between a plausible-sounding line item on a sustainability checklist and a costed project with its own return on investment, independent of whatever else is on the list.
Where this fits in a broader energy plan
None of this argues against the higher-capital measures, a VSD retrofit or a heat-recovery system can deliver genuine, larger savings over time. What leak repair offers is a project that can start this month, inside an existing maintenance budget, with a payback measured in months rather than years. For a sustainability team that needs to show progress on an energy-reduction target before the next reporting cycle, that's a meaningfully different kind of project to have available, one that doesn't depend on next year's capital allocation to start moving the needle this year.
It's also not a one-time exercise. A site that fixes every leak found in a single survey and stops there will see leak load start climbing again immediately, vibration, thermal cycling, and thread wear don't pause because a repair round happened. The quick win stays a quick win for as long as it's revisited on a regular cycle, not treated as a box ticked once and closed.
Who actually owns this project
Compressed air leak repair tends to fall into a gap between departments, it's an energy line item that a sustainability team cares about, but the fitting itself gets fixed by maintenance, out of a maintenance budget, on a maintenance timeline. That split is actually an advantage rather than a coordination problem: it means the project doesn't need a joint capital submission or a shared budget line to start. A sustainability team can commission the survey and use the resulting figures for its own reporting, while maintenance works the repair list at its own pace, inside its existing budget, without either team waiting on the other's approval cycle.
Run the numbers for your own site with the ROI calculator, or see how an acoustic survey finds the leaks without shutting the line down to fix them.