Battery storage for business: When a business battery pays, and when it does not
The short answer
A commercial battery costs roughly $600 to $1,000 per kWh of storage installed in 2026, ex GST. On its own it pays back inside 10 years only against a heavy winter demand charge, such as Lakeland's in Frankton and Wanaka, where our model gives 4.5 to 11.5 years, so only at the good end of our range. Storing surplus solar takes 24.5 years or more.
What a battery earns
Four jobs a business battery can do
- Cutting a demand charge
- Some lines companies charge larger connections for their demand at the network's peak: Orion and Lakeland on the average across winter control periods, Network Tasman on the single highest half hour of the year. A battery that runs through those windows cuts the charge. This is the use that can pay.
- Moving use out of peak lines charges
- OtagoNet and Orion charge more per kWh in the morning and evening peaks than overnight. A battery charged at night and run at the peak saves the difference, if your retail plan passes those prices through. The spread is real but small.
- Storing surplus solar
- Midday generation you cannot use exports for about 8 cents a kWh. Stored and used after sunset, it saves the 20.4 to 25.5 cents you would have paid. On its own it is the slowest of the four, and a South Island winter leaves little surplus to store.
- Riding through outages
- With the right inverter and a changeover, a battery can carry milking, chillers or a cold store through a short outage. That value is real but particular to each site, so we leave it out of the payback and price it with you.
Grid programmes that pay batteries exist: Transpower buys demand response by tender, and the Electricity Authority’s emergency reserve scheme, which it aims to start in late 2026, is open to batteries behind the meter. Neither publishes what it pays, so neither is in our numbers.
The numbers
Where a battery pays back in the South Island
| Network | Who pays it | What the battery cuts | Earns a year per kWh | Payback | Inside 10 years? |
|---|---|---|---|---|---|
| Lakeland (OtagoNet), Frankton and Wanaka | Businesses, 23 to 138 kVA | Winter control period demand: $1.04 per kW a day | $81 to $129 | 4.5 to 11.5 years | Only at the good end |
| Lakeland (OtagoNet), Frankton and Wanaka | Businesses, 172 to 276 kVA | Winter control period demand: $0.71 per kW a day | $55 to $88 | 6.5 to 17.5 years | Only at the good end |
| Orion, Christchurch and central Canterbury | Major customers, over 300 kVA (150 to 300 kVA by choice) | Winter control period demand: $0.43 per kVA a day | $33 to $53 | 10.5 years or more | No |
| OtagoNet, Rural Otago | Businesses, 10 to 100 kVA | Peak lines charge: 14.4 cents a kWh against 2.3 cents off peak | $36 | 15.5 years or more | No |
| Network Tasman, Tasman District | Businesses over 150 kVA | Anytime maximum demand: $0.27 per kVA a day | $11 to $32 | 18 years or more | No |
| Any network | Sites whose solar exports a surplus | Exports: surplus solar stored for the evening saves 20.4 to 25.5 cents a kWh instead of earning 8 | $16 to $23 | 24.5 years or more | No |
| Orion, Christchurch and central Canterbury | Businesses, 70 to 300 kVA | Peak lines charge: 9.8 cents a kWh against 0.3 cents off peak | $20 | Over 25 years | No |
The 10-year test is the warranty: past it, a battery has about 70 percent of its capacity left and no maker standing behind it, so a payback beyond it is a battery that may never pay for itself.
Most business connections on the networks we checked pay no charge a battery can cut: Orion charges demand only to major customers, Network Tasman only above 150 kVA, and MainPower’s standard business connections and OtagoNet’s general connections not at all. We have not yet modelled Aurora Energy, Alpine Energy, EA Networks, Marlborough Lines, Network Waitaki, Westpower or Buller; a feasibility study reads your own network’s schedule.
A battery can do more than one job: cut winter demand in the control periods and store surplus solar through the summer. Stacking jobs shortens the payback, which is why a study models the stack on your half-hourly data rather than one use at a time. Lakeland’s charge is also averaged with the previous year’s, so the saving there builds over a few winters rather than arriving at once.
How each charge is measured
- Lakeland (OtagoNet), businesses, 23 to 138 kVA: Average demand across the ripple-signalled winter control periods (usually 2 to 3 hours, on about 20 to 50 days from May to September), charged instead of per-kWh lines charges and averaged with the previous year's level. Source: OtagoNet Lakeland pricing schedule, 1 April 2026; OtagoNet pricing methodology 2026/27.
- Lakeland (OtagoNet), businesses, 172 to 276 kVA: Average demand across the ripple-signalled winter control periods (usually 2 to 3 hours, on about 20 to 50 days from May to September), charged instead of per-kWh lines charges and averaged with the previous year's level. Source: OtagoNet Lakeland pricing schedule, 1 April 2026; OtagoNet pricing methodology 2026/27.
- Orion, major customers, over 300 kVA (150 to 300 kVA by choice): Average kVA across the ripple-signalled control periods from 1 May to 31 August, which Orion aims to keep to 80 to 100 hours a winter, usually 2 to 3 hours at a time. Source: Orion delivery price schedule, 1 April 2026; Orion pricing policy, 1 April 2026.
- Network Tasman, businesses over 150 kVA: The single highest half hour of demand in the 12 months to October, so one missed peak sets the charge for the year. Source: Network Tasman pricing schedule and policy, April 2026.
- OtagoNet, businesses, 10 to 100 kVA: Peak 7 to 11am and 5 to 9pm every day; night 11pm to 7am. Source: OtagoNet delivery prices, 1 April 2026.
- Orion, businesses, 70 to 300 kVA: Peak 7 to 11am and 5 to 10pm on weekdays; off peak 10pm to 3am. Source: Orion delivery price schedule, 1 April 2026.
Panels first
Solar first, battery second
Solar sized to the power you use in daylight pays back far faster than storage, because every kWh goes straight onto your own load. Our commercial solar guide sets out payback by industry. A battery is a separate decision with its own numbers.
Design the solar battery-ready: an inverter that can take a battery later and room for the cabinet. Then add storage when a demand charge, a backup need or a falling price makes the case.
The 2026 export rules tilt towards batteries without changing that order. From 1 April 2026 lines companies must pay a rebate for power exported into network peaks, at a minimum to households and to businesses on connections up to 45 kVA, and retailers need not pass it on in full. Retailers with at least 5 percent of connections must now offer time-varying plans for use and export to households and small businesses (under 40 MWh a year) with smart meters. Both reward a battery that exports in the evening peak, and most larger commercial sites sit outside them. Export and buy-back rates for business.
Outages
Backup power is a design decision
A grid-tied solar system shuts down in an outage, so it cannot feed a line crew working on a fault, and adding a battery does not change that by itself. Backup needs an inverter that can island the site and a changeover that separates your circuits from the network. Decide which loads it must carry, for how long, and size for that.
Outages are not rare on rural lines. Network Tasman’s customers averaged 569 minutes without power in the year to March 2026, against 265 the year before, with five major weather events behind 288 of those minutes (Network Tasman annual report, 2026). DairyNZ’s outage guidance puts a generator big enough to run a dairy, refrigeration included, at around $30,000, and warns it is no use without a changeover switch fitted first. A battery competes with that generator on short outages, not long ones.
The rules
What a battery on your site must meet
The amended Electricity (Safety) Regulations, in force since 13 November 2025, cite the AS/NZS 3000:2018 wiring rules, which bring in AS/NZS 5139, the safety standard for battery installations. Work started after 12 November 2026 must meet the new standards, and inverters connected to the grid must meet AS/NZS 4777.1.
A battery connects through an inverter, so the lines company must approve it before it goes live, as with solar: systems over 10 kW go through the fuller application. The installation needs a Certificate of Compliance and an independent inspection. Tell your insurer before it goes in. We manage all of it.
Paying for it
Tax, loans and grants
A new business battery should qualify for the Investment Boost: an immediate deduction of 20 percent of its cost, worth about 5.6 percent of the cost in year-one tax cash at the 28 percent company rate. It is a deduction, not a discount, and the table above already counts it. IRD names no depreciation rate written for a business battery, so confirm the treatment with your accountant. Investment Boost calculator.
ASB Smart Solar Loan: 0 percent for 5 years on up to $150,000 for ASB rural customers' on-farm solar and battery. Reverts to a floating business rate after five years. Terms checked against asb.co.nz on 8 October 2026.
No grant for business batteries is open as at October 2026: EECA’s Efficient Demand Flexibility fund closed on 15 May 2026. What exists for businesses.
Straight answers
Questions businesses ask about batteries
Is a battery worth it for a business?
Only where it cuts a large charge. On its own it pays back inside 10 years only against a heavy winter demand charge, such as Lakeland's in Frankton and Wanaka, where our model gives 4.5 to 11.5 years, so only at the good end of our range. Storing midday solar for the evening, the use most battery sales lead with, takes 24.5 years or more. Most business connections on the networks we checked pay no charge a battery can cut, so start with panels sized to your daytime load and treat a battery as a separate decision.
How much does a commercial battery cost in NZ?
We work to $600 to $1,000 per kWh of usable storage installed for 100 to 500 kWh systems, ex GST, in 2026. No benchmark for commercial systems is published in New Zealand: home batteries average $1,219 per kWh installed including GST (MySolarQuotes survey of 63 installs, September 2026), and larger systems cost less per kWh. Real quotes settle it.
How long will a battery run my site?
Divide the usable storage by the load: 200 kWh runs a steady 50 kW load for about four hours when new, less as capacity fades towards 70 percent over 10 years. Size to the job: a winter control period usually lasts two to three hours and an evening peak window four to five.
What is peak shaving?
Running a battery to cap the power a site draws when its lines company charges for demand. In New Zealand it only pays where the connection carries a demand charge: Orion charges one to major customers, Network Tasman above 150 kVA and Lakeland to business connections in Frankton and Wanaka. Overseas claims that demand charges make up most of a bill come from tariffs that do not apply here.
Will a battery keep us running in a power cut?
Only if it is designed to. A grid-tied inverter shuts down when the grid fails so it cannot feed a line crew working on a fault, battery or not. Backup needs an inverter that can island your site and a changeover that separates your circuits from the network, specified at the design stage.
Is there a subsidy for business batteries in NZ?
No grant is open as at October 2026. EECA's Efficient Demand Flexibility fund, which paid up to 40 percent of batteries and controls for larger sites, closed on 15 May 2026, and Solar on Farms is closed. The Investment Boost deduction and bank green lending are what remain.
Does the Investment Boost apply to a battery?
A new business battery is a depreciable business asset, so it should qualify: deduct 20 percent of its cost in the year it is first available for use, worth about 5.6 percent of the cost in tax cash for a company. It is a deduction, not a discount. IRD names no depreciation rate written for a business battery, so confirm the treatment with your accountant.
What rules apply to a battery on a business site?
The amended Electricity (Safety) Regulations, in force since 13 November 2025, cite the AS/NZS 3000:2018 wiring rules, which bring in AS/NZS 5139, the safety standard for battery installations. Work started after 12 November 2026 must meet the new standards. The lines company must approve the battery before it connects, and the installation is certified and inspected like any grid-connected system.
Send a year of bills. We will tell you if a battery pays.
An independent feasibility study on your own half-hourly data and your lines company's actual charges: solar, battery or both, sized, priced and financed. No obligation, and yours to keep.