Australia’s Biggest Coal Generator Just Filed Plans for Two Giant Batteries
AGL files plans for a 350 MW Kangaroo Valley BESS and a 500 MW / 4,000 MWh eight-hour Bathurst battery — NSW firming pipeline, not your wall unit.
Batteries
New South Wales — Here's what just landed on the transmission map. AGL, still Australia's biggest coal generator among the big privately owned utilities, has filed plans for **two** new grid batteries: a **350 MW / 1,400 MWh** project at **Kangaroo Valley** south of Sydney, and a **500 MW / 4,000 MWh** eight-hour machine at **Bathurst / Eglinton** west of Sydney — AGL's biggest storage bet to date.
This is not a wall-unit launch. It is utility kit on major **330 kV** corridors. The homeowner stake is simpler: big batteries firm the network so midday renewables stay useful after dark — and a home battery still owns the hours behind *your* meter.
Invest in your independence where the meter still answers to you. Stake your claim on evening power you control.
Source: RenewEconomy / Giles Parkinson & Joshua S Hill, 23 Sep 2026.
Context only: Liddell done, Tomago under construction
AGL has only just completed the **500 MW / 1,000 MWh** Liddell battery at its shuttered Hunter coal site — already covered on this site as NSW firming that hit full commercial ops. Separately, a **500 MW / 2,000 MWh** battery is under construction next to the Tomago aluminium smelter near Newcastle.
Today's news is the *next* filing: Kangaroo Valley into federal EPBC assessment, and Bathurst sized as an eight-hour operator with spare modules planned for a twenty-year life. Liddell is backdrop. These two proposals are the lead.
Plan 1 — Kangaroo Valley: 350 MW / 1,400 MWh, EPBC live
South of Sydney, AGL proposes **350 MW / 1,400 MWh** near a major **330 kV** switching station under an existing transmission corridor.
Per the EPBC application as reported:
- Roughly **1.2 km** of underground line to the Kangaroo Valley **330 kV** station
- Upgrades flagged on **Old Bendeela Road** and nearby intersections
- If approved: up to about **150** construction jobs at peak and **3** ongoing roles
A late-**2024** NSW scoping report also canvassed a larger **400 MW / 1,600 MWh** layout and other chemistries — sodium and flow among them. The live federal assessment figure for the news cycle is the **350 / 1,400** package. Treat the bigger option and alternate chemistries as scoping range, not a second approved project.
Plan 2 — Bathurst / Eglinton: eight-hour, AGL’s biggest yet
West of Sydney, the Bathurst battery sits about **6 km** from town at **Eglinton**, on an existing **330 kV** corridor — close to EnergyAustralia’s proposed Mt Piper battery at that coal site.
Published sizing:
| Measure | Figure | | --- | --- | | Operating capacity | **500 MW / 4,000 MWh** (nominal **eight-hour**) | | Planned installed energy | **>5,400 MWh** (redundancy over a **20-year** life) | | Construction target | Late **2028** | | Full operation | **2030** |
That installed-over-operating gap is intentional spare capacity for degradation and redundancy — not a second battery next door. It is AGL’s largest storage proposal to date.
NSW already has the Waratah Super Battery doing transmission-support work at a different scale and job. Bathurst’s pitch is duration: eight hours of firming on a western corridor, not a Central Coast shock-absorber brag.
The duration ladder: 1h → 2h → 4h → 8h
AGL’s own storage path reads like a ladder:
- **One-hour** — Broken Hill (NSW) and Torrens Island (SA)
- **Two-hour** — Liddell (**500 MW / 1,000 MWh**)
- **Four-hour** — Tomago (**500 MW / 2,000 MWh**), under construction
- **Eight-hour** — proposed Bathurst (**500 MW / 4,000 MWh** operating)
Falling module costs plus a longer firming need pull the industry toward multi-hour machines. Megawatts are the *rate*; megawatt-hours are the *tank* — useful when renewables stretch overnight, not only through the dinner spike.
What batteries are for (paraphrased, not a quote dump)
AGL’s public line, paraphrased: batteries help replace coal-fired plant with flexible storage; they respond fast to shortfalls; they store excess renewables; they support a more reliable, resilient system.
That is grid language — not a promise your retail bill drops when a western NSW container farm switches on.
Homeowner twist: same job, different side of the meter
Grid BESS firms at scale — soaking surplus, covering shortfalls, buying the network time. A home battery does the same *behind the meter*: store midday solar, spend it when you draw, keep priority circuits on your terms when the design supports backup.
A Bathurst or Kangaroo Valley filing does **not** set your tariff, wipe the daily supply charge, keep the house lit through every local line fault, or invent a dollar saving on your next statement. What you can still own: roof solar matched to load, a compliant home battery sized to evening circuits, and tariff literacy so peaks hurt less.
Soft path only if you are shopping storage: federal **Cheaper Home Batteries** support is typically framed around / up to **~30%** off eligible home battery systems when you qualify. Eligibility depends on property and current rules — never invent a household dollar figure off a utility BESS headline. For who actually wins on the rebate math, read federal home battery rebate — who wins.
Stake your claim where the pipeline won’t
Two giant NSW filings from Australia’s biggest coal generator among the big private utilities is real network news. Kangaroo Valley is in EPBC assessment; Bathurst is pitched as an eight-hour operator with spare modules for a twenty-year life. Mega-BESS keeps the corridor honest. Your independence still starts on the roof and in the garage — with an eligible home battery stack when the site and rules fit.
If grid headlines have you staring at the bill, bring that bill to a design consult. Own your evening power. The containers will keep cycling either way.
