A battery cuts your demand charges by discharging during your site's busiest moments, so the grid never sees your full peak draw. Because demand charges are billed on your single highest 30-minute spike in the billing period — not your total energy use — flattening that one spike can take a real chunk off a Melbourne business's electricity bill.
If your business bill has a line item measured in kVA, you're paying demand charges, and a battery is one of the few things that can directly reduce them. Here's how it works and where it does — and doesn't — stack up.
What is a demand charge, and why is it on my bill?
A demand charge is a fee based on the highest rate at which your business pulls power from the grid, not how much energy you use overall. Your meter records demand in 30-minute blocks, and your network charges you on the single highest block in the period — typically measured during the 7am to 7pm window on business days.
That's why two businesses using the same total energy can get very different bills. A site that draws power in short, sharp bursts — compressors, ovens, refrigeration cycling, machinery starting up — gets punished by demand charges even if its overall consumption is modest.
How does a battery reduce demand charges?
A battery reduces demand charges through "peak shaving" — it detects when your site is about to spike and discharges to cover the surge, so the grid only ever sees a lower, smoother draw. The network meters a lower maximum demand, and your demand charge drops accordingly.
The same battery can also shift energy use: charging when power is cheap (from solar during the day, or off-peak overnight) and discharging during expensive peak periods. So a well-set-up commercial battery can attack both halves of your bill — the demand charge and the peak energy rate.
How much can a business actually save?
It depends — and any installer who gives you a firm number before seeing your data is guessing. Real savings come down to your tariff, how spiky your demand profile is, and whether those spikes happen at predictable times the battery can cover.
Honestly, businesses with sharp, regular peaks against a lower baseline tend to see the strongest returns from peak shaving. A site with a flat, steady load all day has little peak to shave, so the demand-charge savings are smaller — though solar self-consumption and backup may still make a battery worthwhile. The only way to know is to look at your interval data, which we'll do as part of a quote.
Is peak shaving worth it for my business?
Peak shaving is usually worth it for sites with spiky demand, a high demand-charge component on their bill, and predictable daily patterns. It's a weaker fit for flat-load sites where there's little peak to remove.
A few questions worth asking: Is the demand charge a big share of your bill? Do your spikes cluster in the 7am–7pm peak window? Do you already have solar that's exporting for almost nothing? If you're answering yes, a battery is worth modelling properly.
Does the federal rebate apply to business batteries?
Yes. The federal Cheaper Home Batteries Program covers businesses and community organisations, not just households, for battery systems from 5 kWh up to 100 kWh. It provides federally funded STC credits to reduce the cost for households AND businesess, with rebate-eligible certificates applying to the first 50 kWh of usable capacity. The battery must be paired with solar, use a Clean Energy Council approved product, and be installed by an accredited installer.
For larger commercial systems the rebate only subsidises part of the capacity, so the business case still rests mainly on demand-charge and energy savings — but the rebate meaningfully shortens payback on the first slice of storage.
What we install for commercial sites
For business and industrial sites we install the Dyness Stack 100, a modular high-voltage LFP system that scales up as your site needs, with a 10-year warranty, built-in fire suppression, and an operating range suited to Australian conditions. Being modular, it's sized to your load and demand profile rather than a one-size package.
We're a local, family-run Melbourne installer and we install to the AS/NZS 5139 safety standard. To understand your peak-demand pattern we start with your actual interval data — we size to you, not to a brochure. See our commercial battery storage page for more, and our service areas to check we cover your site.
FAQ
Is a demand charge the same as a peak usage charge?
No. A peak usage charge is for the energy (kWh) you use during peak hours. A demand charge is for your highest rate of draw (kVA or kW) in a 30-minute window. A battery can help with both.
Will a battery remove my demand charge completely?
Rarely all of it. A battery is sized to cover your typical spikes, but an unusually large or sustained surge can still set a new peak. The goal is to reduce the demand charge substantially and reliably, not to promise zero.
Do I need solar to install a commercial battery?
To claim the federal rebate, yes — the battery must be paired with new or existing solar. A battery can still shave demand without solar, but you'd lose the rebate and the cheap daytime charging that solar provides.
How do I find out if my site is a good fit?
Send us a recent bill and, ideally, your interval data. We'll look at how spiky your demand is and whether the savings justify a system before you commit to anything.
Want to know if a battery would cut your demand charges? Huracan Energy is a local, family-run installer (Victorian electrical licence REC-37166, NETCC Approved Seller, Clean Energy Council member) and we'll model it against your actual usage. For a free, no-obligation assessment, call Rhys on 0428 660 510 or visit our commercial battery storage page.