Batteries keep coal stations running.
What wears out a coal station isn't age. It's the daily grind: throttled back every midday, ramped hard every evening, all year round. Grid batteries take that punishment off the boilers, and that's what can carry Queensland's coal fleet to 2046 and beyond.
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What actually wears out a coal unit
Coal-fired units were built to run steady, and they are at their worst doing the one thing today's grid asks of them most: back off at 10am, sit at minimum load through the afternoon while rooftop solar floods the network, then ramp hard from 4pm to meet the evening peak.
Every cycle stresses the metal. Tube leaks, cracked welds, fatigued headers, forced outages. The maintenance bill goes up, availability goes down, and eventually an engineer signs off a unit that could have run for another decade.
Queensland has committed $1.6 billion to keep the fleet's technical health up. The cheapest maintenance is not having to cycle in the first place. That is what grid storage buys.
Five things a battery does for a coal station
- Lets the units run flat
- A battery soaks up the midday surplus so the units don't have to drop to minimum load and climb back. Fewer thermal cycles, fewer trips, longer life. It's the difference between a highway run and stop-start traffic.
- Buys the hours nobody else wants
- Overnight and midday, a coal station's output is worth very little — at times less than nothing. A charging battery is a paying customer for exactly those hours, and it props up the price floor in the periods coal can't avoid generating.
- Takes frequency control off the boilers
- Holding the grid at 50 Hz used to mean coal units running below full output to keep headroom in reserve. Batteries do that job faster and better, so the units can sell every megawatt they make.
- Covers a trip
- When a unit trips, a nearby battery responds in a fraction of a second. A trip becomes a maintenance job instead of a statewide event, which makes older units easier to justify keeping in service.
- Uses the wires that already exist
- Storage near existing transmission lines plugs into connection and transmission that was paid for decades ago. No new corridors through grazing country, no new easements, no new fight.
Queensland's own power stations are already doing this
The state-owned generators that run the coal fleet are building batteries at the stations themselves, and running them on the stations' own operating systems.
| Battery | Where | Size | Owner | Status |
|---|---|---|---|---|
| Tarong Battery | On site at Tarong Power Station, South Burnett | 300 MW / 600 MWh | Stanwell (state-owned) | Operating since February 2026. Takes the site to 2.1 GW, the largest generating site in the state. |
| Stanwell Battery | Beside Stanwell Power Station, near Rockhampton | 300 MW / 1,200 MWh | Stanwell (state-owned) | Under construction, due 2027. |
| Chinchilla Battery | Western Downs | 100 MW / 200 MWh | CS Energy (state-owned) | Operating since July 2024. |
Storage is essential to “manage minimum system load, supporting coal unit reliability.” Queensland Energy Roadmap, Queensland Treasury, 2025
That sentence is from the state government's own plan — the same plan that abolished the 2035 closure dates, reset every coal station to its technical end of life, and forecast up to 3.8 GW of new storage by 2030 alongside it.
Stanwell says it wants 5 GW of storage built or contracted by 2035. These are the people whose job it is to keep Tarong, Stanwell and Callide running. They are not building batteries to shut themselves down.
Private money is building them too
Four private companies have built grid batteries in Queensland on transmission that already existed. They earn by buying power when it is cheap and selling it into the evening peak, and by holding the grid's frequency.
| Battery | Where | Size | Owner | Status |
|---|---|---|---|---|
| Wandoan South | Woleebee, near Wandoan, at Powerlink's Wandoan South substation | 100 MW / 150 MWh | Vena Energy (private) | Operating since August 2022. Built for $120 million. |
| Bouldercombe | Bouldercombe, near Rockhampton, at Powerlink's 275/132 kV substation | 50 MW / 100 MWh | Genex Power (private) | Operating since late 2023, on an existing 132 kV bay. |
| Western Downs | Near Chinchilla, on Powerlink's network | 540 MW / 1,080 MWh in two stages | Neoen (private) | Operating. A third stage of 305 MW / 1,220 MWh is under construction for summer 2027-28. |
| Supernode | South Pine switchyard, Brendale, north of Brisbane | 520 MW / 1,858 MWh in two stages | Quinbrook (private) | Operating. A third stage takes it to about 780 MW / 3,073 MWh. |
None of these sits inside a power station fence, and none needed a new line built to reach it. Each one plugs into the same network the coal fleet feeds and runs on the same price signal: charge when the state has a surplus, discharge when it is short. That is the work that keeps a coal unit running flat, and it is being done by companies that get paid only when the battery does it.
Your station
What the battery next door means for the units you can see from town. One page per station, same facts, local framing.
- Tarong, South Burnett → A 300 MW battery on site since February 2026, beside four 350 MW units.
- Kogan Creek and Chinchilla, Western Downs → A 100 MW battery beside Australia's largest single coal unit since July 2024.
- Stanwell, Central Queensland → A 300 MW, four-hour battery under construction on site, due early 2027.
Straight answers
Aren't batteries a renewables thing?
A battery doesn't know what charged it. It stores electricity from whatever is cheapest at the time. Queensland's overnight power is mostly coal, so a battery charging at 2am is storing coal power and selling it at 6pm. Storage is fuel-neutral. That's the point.
Won't batteries just make it easier to close coal stations?
Storage makes any grid more resilient, including one with less coal in it — we won't pretend otherwise. But the immediate, measurable effect is fewer cycles, fewer trips and fewer forced outages, which are the things that actually end a station's life early. The government's plan pairs coal to 2046 with gigawatts of new storage for that reason.
Do batteries push up power bills?
They do the opposite in the evening. Batteries sell into the 5pm–8pm peak, which is where the price spikes come from, and more of them means flatter prices. That trims what every generator earns at the peak, coal included — but a coal station's real cost problem is cycling and outages, not evening prices.
Who pays for them, and how long do they last?
The companies that own them. Stanwell put $514 million into Tarong and CS Energy $150 million into Chinchilla, two state-owned generators investing in their own stations. Four private companies have built their own, listed above. Every one of them earns it back the same way: buy power when it is cheap, sell it into the 5pm–8pm peak, and get paid to hold the grid's frequency in between.
The cells do wear out. Tesla's standard Megapack warranty runs up to 15 years, with a 20-year option, and CSIRO costs a grid battery on a 20-year warranty. When the cells are done, the yard, the connection and the wires stay, and new cells go into the same racks. Set that against the alternative. A coal unit cycled every day gets tube leaks, forced outages and an early retirement, and nobody warrants a boiler against that.
Do they need new transmission lines?
Not when they're sited well. A grid battery can connect to existing transmission lines, using capacity that's already there. Site it near the lines and there's nothing new to build.
What about farmland?
A grid battery is a few hectares of hardstand. All of our storage needs can be satisfied within a tiny footprint.
Are they safe?
Grid batteries are containerised, spaced apart, monitored around the clock and built to standards written specifically for them. Stanwell put one on the same site as a 1,400 MW power station and runs it with the station's own operators. They wouldn't have done that with something they didn't trust.
What we're asking for
- Treat grid storage as firming infrastructure in state and local planning, not as renewable generation. It should be assessed like a substation, because that's what it behaves like.
- Fast-track approvals for storage near existing transmission lines and on industrial land, where the wires already exist.
- Build it with the workforce that's already there. Station operators, electricians and local contractors delivered Tarong. They can deliver the next ones.
If you're a councillor, a member of parliament, a station worker or someone who'd like to see the local station keep running, we'd like to talk.