Stanwell’s General Manager, Central Generation Angie Zahra writes “So far this year, Stanwell Power Station has contributed 15% of the state’s total electricity, with 93.4% availability and 99% reliability. A big part of that is thanks to our ongoing investment in maintenance. This year marks our first without an outage as we shift to a new five-year overhaul cycle. Our next planned outage will be in May 2026, when we take Unit 3 offline.”
Mega Delivery Marks Major Milestone:
Three hundred and twenty-four Tesla Megapack 2XL units have now arrived at site and together will make up Stanwell’s 300 MW Battery Energy Storage System.
Each lithium-ion unit weighs 38 tonnes and is 8.8 metres long.
This delivery is a significant milestone for Stanwell’s portfolio diversification efforts to include cleaner and more flexible energy solutions.
The Stanwell Battery strengthens our portfolio by enabling us to store excess energy during the day and disperse it when demand is high.
It is just one part of the 800 MW of battery energy storage capacity we have in our pipeline.
Capable of discharging 300 MW of energy for up to four hours (1200 MWh), our mega battery will be one of the largest in Queensland.
The Megapacks are being installed by Yurika, a Queensland government-owned company. Several local contractors are involved, and around 80 jobs are being created during the project’s construction.
The Stanwell Battery is scheduled to supply electricity to the grid from May 2027.
Check out the video of the mega packs being delivered here!
Battery’s Innovative Use Of Fly Ash:
As part of our commitment to sustainable energy solutions, Stanwell supplies tonnes of coal combustion products (CCPs) each year to the construction industry. CCPs are the main by-product of burning coal at our power stations, and can be identified as three separate products:
- Fly ash which is a fine, powdery material produced as a byproduct of burning pulverised coal in power stations. It is widely used in construction and engineering, including in concrete production and in the manufacture of bricks, blocks and tiles.
- Bottom ash which consists of heavier particles that settle at the base of the boiler. It is used for structural fill, road stabilisation and pipe bedding.
- Cenospheres which are lightweight, hollow spheres formed during fly ash production. They are used in ceramics, plastics, resins and paints.
CCPs in action:
Stanwell’s battery project is using the power station’s fly ash to create the concrete slabs that the 324 batteries will live on, to support, protect and insulate each Tesla Megapack unit.
In total, nearly 7,500m³ of concrete has been poured into the slabs, incorporating 1,100 tonnes of fly ash (6 per cent of the total mix). By including fly ash in our concrete mix, we’ve been able to conserve valuable natural resources and lower the environmental impact of the project.
The concrete slabs play an important role to the megapack units, by preventing shifting or settling, ensuring the proper alignment and performance of the battery and buffering ground temperature fluctuations.
Read Stanwell’s September 2025 Newsletter in full HERE
