Commercial battery storage. The return is in the tariff.
A commercial battery does not make money by storing energy. It makes money by changing which prices you pay — shifting load out of expensive windows, shaving the demand peak that bills for a year, and keeping solar generation on site instead of exporting it for cents. All four levers live in your tariff structure, which is why the same battery pays back in three years on one site and never on the next. Start with the bill, not the brochure.
Written by Juan Flinn, Content Editor · Reviewed by the Mission Green commercial team · Updated 31 August 2026
Four ways a battery earns.
Your tariff picks which.
Rank them for your site before anyone quotes a size.
Time-shifting. Charge when energy is cheap — from your solar, or off-peak — and discharge through the expensive windows. Only worth what the spread between those prices is on your contract.
Demand shaving. On tariffs with a demand component, one half-hour peak can set a charge that bills for months. A battery that reliably covers that peak attacks the most expensive line on the bill. It is also the hardest job to do properly — more below.
Solar soak. If your array already exports at midday for a few cents, storing that energy and using it at 6pm converts feed-in rates into retail rates. This is the lever that makes an existing oversized array look better.
Backup. Real value for genuinely critical load — refrigeration, servers, tills — and routinely oversold as whole-site protection. Backup is a wiring and sizing decision, not a brochure line.
A site on a flat rate with no demand line has one lever, maybe two. A site on a demand tariff with big export has all four. That difference — not the hardware — is why payback claims vary so wildly.
Three questions
before kilowatt-hours.
Anyone quoting a size without these answers is guessing.
Where is your interval data?
Twelve months of half-hourly consumption is the only honest basis for sizing. Your retailer or meter provider must give it to you on request — a proposal built without it was built for a different site.
What does your peak cost?
Find the demand line on your bill: the kVA, the rate, and the measurement window. If your peak falls at 6pm in winter, solar cannot touch it — and a battery only helps if it is controlled to be full at 5:55.
Usable, not nominal
Batteries are marketed on nominal capacity and deliver usable capacity. Every payback number should be computed on the usable figure — and the federal discount tiers are set in usable kilowatt-hours too.
What support exists
as at 31 August 2026.
The federal discount covers small business — and NSW adds more from 1 September.
Federal — Cheaper Home Batteries Program. Roughly a 30% discount off an installed battery, and small businesses are eligible alongside households. Support is tiered by size: the full rate applies up to 14 kWh usable, about 60% of the rate from 14–28 kWh, and about 15% from 28–50 kWh. The rate steps down on 1 January 2027 — the same system claims less next year than this year.
NSW — new PDRS battery activities from 1 September 2026. The Peak Demand Reduction Scheme opens upfront incentives for batteries in apartment buildings (BESS3), small and medium businesses (BESS4) and commercial & industrial sites (BESS5). The value scales with usable capacity and is claimed through accredited providers. Batteries installed in residential buildings or data centres are excluded from the business activities.
Tax. Energy assets interact with depreciation rules, and the widely-promoted $20,000 instant asset write-off for 2026-27 was still not law when we last checked — have your accountant confirm before a purchase decision leans on it.
State schemes change; figures above are as at 31 August 2026. The programs page and rebate checker carry the current set, each linked to its government source.
Demand shaving fails
on autopilot.
The most valuable job is the one default settings do not do.
Here is the failure mode we see most: a battery is installed on a demand tariff, left on a generic time-of-use schedule, and discharges cheerfully into the evening price window. Then a cold snap lands, site load spikes at 7:40pm, the battery is already flat — and that one half-hour sets the demand charge for the next twelve months. The bill barely moves, and the battery gets blamed.
Shaving a kVA peak requires three things working together: metering the battery can actually see in real time, headroom held in reserve for the peak window rather than spent on arbitrage, and a control target set to your measured peak, not a postcode default. That is configuration and commissioning work — ask who does it, and what happens when your load profile changes.
If a proposal quotes demand savings, ask for the assumed peak window, the reserve strategy, and what the modelled saving becomes if the peak lands outside solar hours. Honest modelling survives those questions.
So what should
your business actually do?
Short version.
Pull twelve months of interval data before you take a single quote. It is your data and it is the whole basis of an honest size.
Find the demand line on your bill. No demand line means the strongest commercial battery case does not apply to you — and that is worth knowing before, not after.
Compare proposals in usable kWh and in dollars after the federal tiers. Support falls sharply above 14 kWh usable and again above 28 — the incentive-optimal size and the load-optimal size can differ, and you want both numbers in front of you.
Ask who configures demand control, and to what target. If the answer is a default schedule, the demand savings in the model are decorative.
In NSW, time it. The new PDRS business activities commence 1 September 2026 and claim through accredited providers — a quote that ignores them is leaving your money on the table.
Commercial batteries:
your questions, answered.
Four things, and the mix depends on your tariff: shifting cheap or solar energy into expensive windows, shaving the demand peak that sets your kVA charge, soaking up solar you would otherwise export for cents, and backup for critical load. On a flat-rate bill with no demand line, most of those levers do not exist — which is why the same battery pays back on one site and never does on another.
Yes. The Cheaper Home Batteries Program covers small businesses as well as homes — roughly a 30% discount, delivered through the installer. Support is tiered by size: the full rate applies up to 14 kWh of usable capacity, about 60% of the rate from 14 to 28 kWh, and about 15% from 28 to 50 kWh. The rate also steps down on 1 January 2027, so the same system claims less next year.
The Peak Demand Reduction Scheme opens three new battery activities: BESS3 for apartment buildings, BESS4 for small and medium businesses, and BESS5 for commercial and industrial sites. The incentive scales with usable capacity and is claimed through accredited providers — you do not apply to the government yourself. Batteries in residential buildings and data centres are excluded from the business activities.
Only if it is controlled against your demand window, and this is where commercial batteries most often disappoint. A battery left on a generic time-of-use schedule discharges for the evening price and can sit idle — or already empty — during the half-hour kVA peak that sets your charge for the year. Demand shaving needs metering the battery can see and a control setup aimed at your actual peak, not a default profile.
Sized from your interval data, in usable kilowatt-hours — not nominal. Start with the job: covering a 40 kVA peak for two hours is a different battery from soaking 60 kWh of midday export. Note the federal tiers as well: support drops sharply above 14 kWh usable and again above 28 kWh, so the incentive-efficient size and the technically right size are not always the same number. Get both, then decide.
Only what it is wired and sized to run. Whole-site backup through a battery big enough for a few hours of critical load is a common oversell — inrush from motors and compressors, single- versus three-phase, and how long you need to ride through all decide it. Define the circuits that genuinely cannot go down, and back those up properly instead of half-backing everything.
Where these figures come from.
We do not publish system prices on these pages. The number that decides a commercial battery is your tariff structure and interval data, and anyone quoting payback without both is guessing.