ArcActive, the Hornby battery developer that has spent more than a decade reinventing lead-acid chemistry, has installed its first commercial battery system. The shipping-container unit sits at Melbourne’s Deakin University, installed through Australian partner Origin Energy, one of Australia’s big three gentailers with around 5 million customers. The system plugs into Origin’s virtual power plant platform, and a second 100kWh unit goes into a large Sydney manufacturing facility within weeks.
These are pilots, not a sales avalanche. But the customer matters. Getting a Kiwi product wired into the network of a major Australian retailer is a commercial validation most New Zealand clean-tech firms never reach.
The market everyone forgot to serve
Founder Stuart McKenzie splits battery storage into three markets. Home batteries are small, practical and well served. Utility-scale banks that smooth grid demand are also well served. Commercial and industrial (C&I) is, in his words, the barest, despite having the most potential to cut power bills.
“C&I should be massive, but it hasn’t developed… If I can save $100,000 per year with a $300,000 battery, it should be a no-brainer,” McKenzie told the NZ Herald. The problem is lithium. “In C&I, you might have a $500,000 battery close to a $20 million building, and a fire could cause damage to third-party properties as well, so it’s hard for an insurer to qualify.”
That is a three-year payback on paper. In practice, operators get hit with new fire hydrants, blast walls, firewalls and compliance paperwork before a single kilowatt-hour is stored. The battery is cheap. The risk around it is not.
Fire risk is the real price tag
This is where ArcActive’s bet looks smart rather than nostalgic. Lead-acid is old technology with a known safety profile and a recycling economy that already works. Back in 2024, the company said its reinvented batteries carried effectively zero fire risk, with McKenzie noting that “people make money from recycling lead batteries” after 13 years of development in Christchurch.
For property owners, facilities managers and manufacturers, that reframes the decision. The question is no longer just cost per kilowatt-hour, it is total cost of ownership once the insurer and the fire engineer have had their say. ArcActive’s end goal is a 1MWh container aimed squarely at business customers, enough to power roughly 50 homes for a day, priced at about A$276,000 (NZ$337,000) according to the Herald’s reporting. If that unit can sit beside a warehouse without triggering a compliance rebuild, the maths McKenzie describes starts to hold.
A long road through Australia
This is not ArcActive’s first Australian play. In 2024 the company was raising $65-70 million for an Australian factory to build its EnergyStore home battery, targeting 30,000 units a year from a 600MWh plant in Queensland or Victoria.
At the time, the home unit was pitched at roughly A$7,000 installed against about A$17,500 for a comparable lithium system. McKenzie explained the attraction of Australia in 2024 bluntly: “There’s so much solar now that when the sun comes up in the morning, that electricity goes onto the grid, and depending on the state, will go negative.”
A midday glut of free power and expensive evenings is exactly the arbitrage a battery exploits. Australia has it in spades.
Why New Zealand is the second market, not the first
New Zealand’s grid is a different beast. Renewables supplied 94.5% of electricity in the March 2026 quarter, with solar hitting a record 373 GWh, up 50.2% on a year earlier. Across 2025, renewables provided 88.5% of generation, the highest share since 1981.
That hydro base blunts the duck curve that makes Australian storage so lucrative. Building scale across the Tasman is not a failure of New Zealand policy, it is a firm going where the customers are while keeping the IP and R&D at home.
The local market is catching up anyway. Industry body ERGANZ says battery storage capacity has grown more than 300% since 2023, while cautioning that batteries provide energy “for minutes or hours, not weeks or months” and do not replace a full hydro lake. For businesses, that is the right frame. Batteries are a tool for trimming peak charges, not a fix for dry-year risk.
What the pilots need to prove
The Deakin and Sydney units now carry ArcActive’s commercial case. They need to show reliable performance inside Origin’s virtual power plant, and they need insurers to price lead-acid differently from lithium in writing, not just in theory.
If both happen, a Christchurch company will have opened the most neglected segment of the battery market with a chemistry everyone else wrote off. That is a clean-tech export story built on a balance sheet argument, not a slogan, and New Zealand could use a lot more of them.
Sources
- NZ Herald: Christchurch firm develops new type of solar battery, installs it for big Australian customer (2026-10-12)
- NZ Herald: Christchurch firm ArcActive raising $70m for new home battery system (2024-04-15)
- One Step Off The Grid: Home battery upstart takes on Tesla with new spin on lead acid, made in Australia (2024-04-17)
- RNZ: Kiwi company leads the charge in home energy technology (2024-04-17)
- ERGANZ: CEO Insight – New Zealand’s battery boom reshaping our energy system (2026-06-03)
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