A third wind farm has signed a contract to provide 'paired generation' services with the nation's largest and long-delayed 'shock absorber' battery—but the cost of linking the two systems is proving exorbitant. The deal, signed late yesterday, commits the wind farm to deliver firm, dispatchable power by coordinating with the 500MW battery, which is still stalled by supply chain issues.
Industry sources confirm the communications infrastructure required for real-time control will run into tens of millions of dollars. 'The fiber optics and control systems alone are costing more than some smaller batteries,' said Dr. Helen Tran, energy analyst at GridWatch, calling the expense 'a sticking point' for future projects.
The wind farm developer declined to disclose the exact figure, but described the communications cost as 'significant but necessary' to meet grid stability requirements. The battery, originally due online last year, is now expected to begin commissioning in early 2026.
Background
Paired generation links a renewable source, like a wind farm, with a large battery that acts as a 'shock absorber'—smoothing out the variable output and providing fast frequency response. The concept is central to Australia's energy transition, allowing wind and solar to replace coal-fired baseload power without destabilising the grid.
This specific battery, sometimes called the 'GridSoak' project, was announced two years ago as a 500MW/1000MWh facility designed to absorb sudden power surges and fill gaps. However, delays in transformer delivery and software integration pushed its completion back by more than 12 months.
'The battery technology works, but the telecoms and SCADA (supervisory control) systems needed to synchronise a wind farm with a battery over long distances are proving expensive and complex,' explained Dr. Tran. 'Each new pairing requires custom engineering because no two grid connections are identical.'
What This Means
The high cost of communications hardware and software could slow the rollout of future paired generation projects, even as the number of wind and solar farms multiplies. Without affordable, standardised communication systems, developers may struggle to meet market rules that require renewables to provide 'dispatchable' power.
On the positive side, the deal signals confidence in large-scale battery storage as a grid stabiliser. 'Once the first few projects overcome these teething costs, the technology will become cheaper and faster to deploy,' said Mark Sheldon, chief executive of the Clean Energy Council. 'This is a necessary learning phase.'
For consumers, the delay and high cost may be absorbed into electricity prices in the short term, but in the long run, paired generation is expected to lower wholesale power costs by reducing reliance on expensive gas peaking plants. The wind farm involved is expected to reach financial close later this year, subject to finalising the communications contract.