Synergy's Tathra Wind Farm: 1GW of Wind, Half a Gigawatt of Storage, and a Blueprint for Responsible Scale

A wind farm that could power a significant chunk of Western Australia while clearing less than four hectares of native vegetation is a remarkable achievement. That's the headline buried inside Synergy's federal environmental submission — and it deserves more attention than the raw megawatt numbers alone.

State-owned energy company Synergy has submitted the Tathra Wind Farm to Australia's Environment Protection and Biodiversity Conservation (EPBC) Act process, proposing up to 1,000 MW of wind generation, 500 MW of solar PV, and a 500 MW battery energy storage system on approximately 15,847 hectares of predominantly cleared agricultural land in Western Australia's Mid West region. The site sits roughly 15 km east of Eneabba in the Shire of Carnamah — a stretch of country that won't register on most maps but may soon matter a great deal to Australia's grid.

What Tathra Actually Is — and Isn't

Scale without context is just noise, so here's the context: 1,000 MW of wind capacity is enough to rival some of the largest wind installations on the planet. The turbine configuration alone — up to 140 generators with towers reaching 160 metres and blades extending 90 metres for a maximum tip height of 250 metres — signals that Synergy is planning for the largest, most efficient machines currently available or soon to be available commercially.

The 500 MW of solar PV, deployed across multiple arrays via up to one million modules, is almost incidental given the wind component's dominance. But it matters strategically: solar and wind generation profiles complement each other, reducing the periods when the site produces nothing. The 500 MW BESS — distributed across up to three separate facilities — sits on top of that to smooth what's left.

What we don't know yet is the battery duration, and that omission is more significant than it might appear. A 500 MW system at two hours of storage is a fundamentally different tool than the same power rating at four or six hours. Given that Synergy's existing Collie Battery Energy Storage System (CBESS) operates at 500 MW/2,400 MWh — an impressive 4.8-hour average duration — there's reason to believe Tathra's storage ambitions could be similarly substantial. The company clearly thinks in energy, not just power.

Synergy Knows What It's Doing Here

This isn't a developer learning the BESS business on the job. Synergy operates the Collie installation, currently Australia's largest battery storage project by megawatt-hour capacity at 500 MW/2,400 MWh. It also owns the 100 MW/200 MWh Kwinana BESS 1 and the 200 MW/800 MWh Kwinana BESS 2. Combined, Synergy's portfolio exceeds 3,500 MWh of storage capacity across Western Australia's South West Interconnected System (SWIS).

For comparison, Akaysha Energy's Waratah Super Battery in New South Wales holds the title of Australia's largest by power output at 850 MW — but it's currently only partially operational, waiting on a transformer replacement expected in Q3 this year. Synergy, by contrast, is already running. That operational track record matters enormously when a project moves from environmental approval to grid integration.

It's also worth noting Synergy's supply chain relationships. The company has previously partnered with CATL — the world's largest lithium battery manufacturer — on utility-scale storage projects in Western Australia. That relationship gives Synergy both pricing leverage and technology access that independent developers often lack. If Tathra's BESS follows the same procurement path, expect a project built for long-duration performance rather than headline-grabbing power ratings.

The Environmental Angle That Deserves More Credit

Here's the non-obvious story: a 1,000 MW wind farm with a 15,847-hectare development envelope, and the total disturbance footprint is capped at 1,595 hectares. That's roughly 10% of the land touched, not bulldozed.

More specifically, Synergy's application commits to clearing no more than 3.44 hectares of remnant native vegetation and less than one hectare of moderate-to-high-quality foraging habitat for black cockatoos. The proponent has established a 1,054-hectare clearing exclusion area to protect significant patches of native vegetation and known nesting trees for the vulnerable Carnaby's Cockatoo — a species under genuine pressure across southwestern Australia.

The fact that this level of habitat precision exists in an EPBC submission suggests Synergy anticipated federal scrutiny and engineered around it, rather than hoping to negotiate down from a less defensible baseline. That's a more sophisticated approach than most large-scale renewable submissions, where the environmental mitigation strategy tends to be more reactive than proactive.

The site sits predominantly on cleared agricultural land — a deliberate choice that reduces the biodiversity conflict inherent to many renewable projects. When critics argue that renewable energy development trades one environmental problem for another, projects like Tathra, sited correctly with exclusion zones built in from the start, represent a meaningful counterargument.

What the Market Is Telling Us

Tathra doesn't exist in isolation. The EPBC pipeline for large-scale battery storage is filling fast. Neoen Australia submitted its 3.2 GWh Bondo wind-plus-storage project earlier this year. Private Energy Partners put a standalone 780 MW battery project into the same assessment process. Three additional BESS projects have entered federal review, collectively representing 5.5 GWh of new storage capacity across three states.

The pattern is clear: developers are responding to a market that increasingly rewards dispatchable capacity over raw generation. A wind farm alone doesn't win the same contract terms it did five years ago. A wind farm with four-plus hours of storage attached is a different product entirely — one that can firm capacity, participate in frequency markets, and in some cases displace gas peakers.

For investors and landowners assessing the infrastructure market, the SWIS presents a particular opportunity. Western Australia's grid is isolated from the National Electricity Market, meaning it must solve its own reliability challenges internally. Every gigawatt of storage that comes online in the SWIS reduces the system's dependence on gas-fired peaking capacity — a transition with both economic and policy momentum behind it.

What Happens Next

EPBC approval is not a rubber stamp. The assessment process can take years, involve additional information requests, and result in binding conditions that reshape a project's economics. Synergy's careful environmental design — the exclusion zones, the minimal native vegetation clearing, the site selection on cleared agricultural land — reads like a deliberate attempt to reduce that friction.

Assuming federal assessment proceeds favorably, the Tathra Wind Farm would connect directly into the SWIS via the existing 330 kV transmission line that intersects the development area. That existing infrastructure eliminates one of the most capital-intensive and time-consuming hurdles facing greenfield renewable projects: building the line itself.

The Tathra Wind Farm isn't just a large renewable energy project. It's a test case for whether Australia can build at genuine scale — 1,000 MW of wind, 500 MW of solar, half a gigawatt of storage — without the kind of environmental trade-offs that have stalled other major projects. If Synergy threads that needle, the project won't just change Western Australia's grid. It'll establish a template that developers across Australia will study carefully.

[INTERNAL LINK: Synergy's Environmental Initiatives]

[INTERNAL LINK: Battery Energy Storage Systems]

[INTERNAL LINK: Renewable Energy Market Trends]

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