Energy utility AGL has revealed it plans to build a 500 MW battery with four hours of dispatchable capacity next to the Tomago aluminum smelter near Newcastle, New South Wales, as part of its ambition to add 12 GW of new wind, solar and energy storage to its portfolio by 2035. This includes an interim target to have up to 5 GW of new renewables and firming in place by the end of the decade.

AGL told an investor briefing in Melbourne on Friday the 500 MW/2,000 MWh battery to be built alongside the Tomago smelter, which is the biggest consumer of electricity in New South Wales, accounting for more than 10% of electricity use in the state, is part of a renewables development pipeline that has swelled from 3.2 GW to 5.3 GW in the past four months.

AGL also revealed an unidentified 400 MW battery project in New South Wales and a 500 MW project in Queensland have formally entered its growing pipeline of renewable generation and storage developments. The power giant also revealed plans for a 200 MW solar farm to be developed in New South Wales.

AGL Chief Executive Officer and Managing Director Damien Nicks said the addition of the new projects means the company is “well positioned” to achieve its decarbonisation strategy which requires it to increase its development portfolio of renewable energy generation from 1.7 GW to 8 GW of wind and solar by 2035. It will also seek to grow its firming capacity, including grid-scale batteries and pumped hydro, from 1.4 GW to 7.3 GW over that period.

AGL’s onshore development pipeline now totals 5.3 GW. Image: AGL

The company has previously announced plans to exit coal-fired generation by 2035 and on Friday reaffirmed its commitment to close down its Bayswater power station in the Hunter Valley between 2030 and 2033 while the Loy Yang A power plant in Victoria’s Latrobe Valley will be shuttered in 2035.

“This is the biggest transition that this market has ever seen in terms of what we are doing over the next 12 years,” Nicks said. “Today we are sharing with the market how we will deliver on our strategy to connect our customers to a sustainable future and transition our energy portfolio.”

AGL is in the final stages of bringing the 250 MW/250 MWh battery at South Australia’s Torrens Island online with the 50 MW/50 MWh battery being developed near the outback NSW city of Broken Hill expected to switch on in the next three months.

Investors were told AGL is on target to deliver 850 MW of grid-scale batteries by the end of 2025 with the utility planning to fact track the development of a 500 MW/2 GWh big battery at the site of the now-shuttered Liddell coal-fired power plant in the Hunter Valley.

AGL said the final investment decision on the Liddell battery has been brought forward to the end of this year, with the first 250 MW stage expected to receive funding from the Australian Renewable Energy Agency (ARENA).

AGL said it expected to fund 5.5 GW of its targeted 12 GW of newly firmed renewables capacity from its own balance sheet, while the other 6.5 GW would be procured via joint ventures, partnerships, third-party offtakes and distributed energy resources including rooftop solar.