The Hornsdale Power Reserve sits off the Barrier Highway near Jamestown, a few rows of grey Tesla containers behind a chain-link fence that most drivers between Adelaide and Broken Hill wouldn’t give a second look. It doesn’t need to be dramatic. That paddock-adjacent battery has been quietly doing more to shape how the National Electricity Market thinks about frequency control than almost any other single asset built this decade, and it belongs to Neoen Australia, the local arm of a French developer that’s been operating here since the mid-2010s with less noise than its project list would suggest.
I drove past the Hornsdale site again in August, mid-reporting-trip, on my way through to look at a transmission easement further north. It’s still just a battery in a field. But the fact that a relatively modest 150MW/193.5MWh project from 2017, since expanded, is still the reference point everyone uses when they talk about grid-scale storage in the NEM tells you something about how slowly this industry actually moves, despite the announcement pace.
From battery pioneer to a genuine generation portfolio #
Neoen’s reputation in Australia was built almost entirely on Hornsdale. It was the first of the “big batteries,” commissioned with Tesla as the equipment partner at a moment when most of the NEM still treated grid-scale storage as a novelty rather than a firming tool. AEMO’s own market data now treats fast frequency response from batteries as a standard dispatch category rather than a curiosity, and Hornsdale is a large part of why that shift happened as early as it did.
But the company’s current Australian book is wider than one battery near Jamestown. Neoen operates wind farms, solar farms and storage across South Australia, New South Wales and Queensland, and it has been steadily shifting from a pure-storage story to a developer running the full stack: generation plus firming, often co-located, sold into the market as a package to offtakers who want both.
That’s a different pitch to a developer like Akaysha Energy, which has built its name almost entirely on batteries with no retail brand attached. Neoen wants to be judged as a generator first, a storage operator second, and that distinction matters when you’re trying to work out who actually carries the project risk on a given connection.
Goyder South: the wind project that keeps expanding on paper #
Goyder South, in South Australia’s mid-north near Burra, is Neoen’s biggest single commitment in the state outside Hornsdale. The project has been staged: wind first, with battery storage layered in, and the company has talked publicly about a final capacity well north of 1,000MW across the full development envelope, spread over multiple stages with separate development approvals under South Australia’s planning framework.
Here’s where I get a bit sceptical of the topline numbers. Staged wind projects in Australia have a habit of getting announced at their full envisaged capacity and then built out slower, in smaller tranches, as grid connection agreements and transmission capacity actually materialise. Goyder South’s early stages have reached financial close and construction; the later stages depend on transmission augmentation in the region that isn’t fully locked in. The project is real. The headline gigawatt figure is aspirational until the connection agreements for the later stages are signed, and I’d treat anyone quoting the full number as describing an ambition rather than a committed build.
South Australia’s grid is already the most renewables-heavy in the NEM, which is both the opportunity and the constraint. South Australia’s renewable energy record shows a state that’s proven wind and solar can dominate a grid, but also one where curtailment and transmission headroom are live issues for any new entrant trying to find a slot.
Western Downs: the solar farm that quietly became one of the biggest in the country #
Western Downs Green Power Hub, out near Chinchilla in Queensland’s Western Downs Regional Council area, is Neoen’s solar flagship: one of the largest operating solar farms in the NEM by capacity, built on former grazing land with a battery component added to firm output into the evening ramp. It sits in a part of Queensland that’s seen a wave of large-scale solar development over the past five years, partly because the land is cheap and flat, partly because transmission access into the southern Queensland network has historically been easier to secure than in some of the more congested renewable energy zones further south.
The project is a useful case study in how solar-plus-storage economics actually work once a plant’s been running for a couple of years rather than how they look in an investment deck. Chinchilla’s solar output is strong and predictable in the way only inland Queensland sun can be, but the revenue story depends heavily on the battery capturing the evening price spike rather than the farm just exporting flat into a midday market that’s increasingly glutted with rooftop and utility solar. That’s the same dynamic playing out across the grid – see rooftop solar and the midday minimum demand problem, and it’s why batteries attached to solar farms are no longer optional extras, they’re the difference between a project that earns its capital cost back and one that doesn’t.
Collie: the WA battery that tests Neoen outside the NEM #
Neoen’s Collie battery, in Western Australia’s South West, is a different animal entirely because it sits in the South West Interconnected System rather than the NEM. WA’s SWIS grid is an island with no way to call for help – there’s no interconnector to lean on when something goes wrong, which makes fast-acting storage proportionally more valuable there than almost anywhere else in the country.
Collie, built in the old coal town of the same name, is one of the larger batteries in WA and plays into a market that AEMO manages separately from the east coast, with its own capacity mechanism and its own closure timetable for the Collie and Muja coal units nearby. Neoen placing a battery literally in a town whose economic identity has been built around coal for generations is the kind of detail that doesn’t need much editorialising. The symbolism writes itself; the engineering case is sound regardless of the symbolism.
The capacity numbers worth treating carefully #
Neoen doesn’t publish Australian-specific financials as a standalone ASX-listed entity: the parent group reports out of Paris, and the Australian book sits inside consolidated group accounts rather than a local filing anyone here can easily pull apart. That makes it harder to do the kind of clean balance-sheet comparison you can run on a gentailer like AGL or EnergyAustralia. What’s public is project-level: capacity figures in development approvals, connection applications lodged with AEMO, and the occasional investor update from the Paris parent that breaks out regional performance in broad terms.
That opacity isn’t unique to Neoen: most of the foreign-owned developers operating here, including Iberdrola and the various super-fund-backed vehicles, report at group level rather than giving Australian analysts a clean local set of books. But it does mean that when a company talks about its total Australian pipeline in gigawatts, that number is a mix of operating assets, projects under construction, and projects still working through planning and grid connection queues that may never clear. The gap between “in the pipeline” and “financially committed” is where most renewable energy headlines overstate what’s actually locked in, and Neoen’s announcements are no exception to that pattern, not through any particular deception, just through the standard industry habit of quoting the biggest defensible number.
Where Neoen sits in the connection queue problem #
Every big generation developer in Australia right now is fighting the same structural issue: the physical ability to connect new capacity to the grid is lagging well behind the volume of projects seeking a slot. AEMO’s connections process has been under sustained pressure for years, and the Integrated System Plan lays out just how much new transmission needs to be built to accommodate the renewable build-out that’s already been approved, let alone what’s still in planning.
Goyder South’s later stages depend on South Australian transmission augmentation that’s tied to broader interconnection plans across the state. Neoen’s exposure here isn’t unusual. It’s the same bottleneck facing Akaysha, Tilt Renewables and every other large-scale developer with a project past the development-approval stage but short of a firm connection offer. What distinguishes Neoen’s position slightly is the spread: it has operating revenue coming in from Hornsdale, Western Downs and the earlier Goyder South stages already, which gives it more balance sheet patience to wait out connection delays than a newer entrant with nothing generating yet.
A French developer that’s become a fixture rather than a visitor #
What strikes me most about Neoen’s Australian presence a decade in is how unremarkable it’s become. There’s no retail brand, no household name recognition the way AGL or Origin have it, but ask anyone who works in grid operations or market analysis and Hornsdale comes up within the first few sentences. That’s a reasonable legacy for a developer that arrived as a relative outsider and ended up setting the reference point for an entire asset class.
The honest caveat is that Neoen’s forward pipeline, like most of the sector’s, is only as solid as the next connection agreement and the next transmission augmentation getting approved. Goyder South’s full build-out is a bet on South Australian grid expansion happening on a timeline that hasn’t been fully nailed down. Until those later stage connection offers are signed, I’d file the full-capacity number under intention rather than fact: the same discipline I’d apply to any developer’s pipeline slide, French-owned or otherwise.
Next time I’m through the mid-north I might swing past Burra rather than straight up the highway, see how much of Goyder South’s later stages have actually broken ground versus how much is still pegged out on a planning map. That’s usually where these stories get interesting, not in the press release, in the paddock.
For the official project data and connection status, AEMO’s generation information portal and the Clean Energy Regulator’s project register are the two places worth checking before taking any developer’s capacity claim at face value.
– Callum Hayes, Wind & Offshore Correspondent
Photo by Karsten Würth on Unsplash