Delta Lodges Approval Bid for 400 MW / 800 MWh Battery at Vales Point Coal Site

Delta Electricity has lodged a State Significant Development Application and environmental impact statement for a 400 MW / 800 MWh battery energy storage system at the Vales Point power station site in the New South Wales Hunter region.

The application, now with the NSW Department of Planning, Housing and Infrastructure for assessment, follows 18 months of what Delta calls "extensive technical and environmental studies." The Czech-owned generator, a subsidiary of Sev.en Global Investments, is developing the project with South Korean industrial giant Samsung C&T.

Once operational, the Vales Point BESS will run around the clock to strengthen grid reliability and support renewable generation, Delta said. The company framed the project as a structural response to a grid in flux.

"Australia's energy mix and landscape is changing significantly and this project will be a key part of this change," Delta said. "The battery will support the energy transition by strengthening the grid, improving energy reliability and helping manage the significant supply volatility created by an energy system dominated by variable renewable energy."

Why the Vales Point site?

The project's economics and siting logic rest on existing infrastructure. Delta describes the site as "uniquely positioned" to take part in the energy transition once the coal-fired units close.

Two assets anchor that claim:

• The site already serves as a hub for transmission infrastructure, cutting the cost and delay of new grid connections.
• It sits inside the Hunter-Central Coast Renewable Energy Zone, where network upgrades are expected to deliver 1 GW of additional transfer capacity by 2028.

In plain terms: the battery plugs into wires that already exist, in a region the state has prioritised for new energy investment.

What does the application change?

Lodging the SSDA and EIS moves the project from concept to formal assessment. The NSW Department of Planning, Housing and Infrastructure now carries the decision on whether the 800 MWh facility gets built. Delta calls the submission a major step forward for the project.

The regulatory clock, not the technology, now decides the pace.

How does it fit the wider coal-to-battery shift?

The Vales Point proposal reflects a broader pattern among Australian utilities: pairing batteries with existing, and in some cases retiring, coal generation assets. The list of comparable projects is long and getting longer.

Nearby in NSW:

• The 850 MW / 1,680 MWh Waratah Super Battery has reached full commercial operations.
• AGL Energy is building the 500 MW / 1,000 MWh Liddell BESS at the site of the retired Liddell plant.
• Origin Energy's Eraring battery will ultimately reach 1,200 MW / 8,600 MWh, with plans for a 4.9 GWh expansion of the precinct.
• EnergyAustralia plans a 500 MW / 2,000 MWh BESS next to its Mt Piper coal station in the NSW central west.

Elsewhere:

• A 150 MW / 150 MWh battery operates at the retired Hazelwood plant in Victoria's Latrobe Valley — Australia's first big battery at a former coal site.
• Queensland hosts the 300 MW / 600 MWh Tarong battery, now in commercial operation, and the planned 300 MW / 1,200 MWh Stanwell project.

Each project reuses grid connections, land and, in most cases, a workforce built around thermal generation. The takeaway: coal-site batteries have moved from novelty to default option for retiring generators.

What is the deadline that matters?

Delta has announced it will shut Vales Point power station in 2033. The 1,320 MW plant supplies about 4% of Australia's electricity, so the battery is a bridge asset, not a replacement — 800 MWh of storage against more than a gigawatt of dispatchable coal capacity.

The next milestone is the planning department's assessment of the SSDA and EIS. Approval timing will determine whether the BESS is running well before the 2033 closure, or racing it.