Australia’s 90% battery owner no-show hits power pricing model assumptions

Australia’s 90% battery owner no-show hits power pricing model assumptions Energy ministers are building policy around dynamic pricing even though nine in ten home battery owners reject it. About 90% of household battery owners in Australia’s National Electricity Market do not participate in virtual power plant programs or any form of dynamic pricing, a new analysis shows.⁴ That figure matters because the entire case for shifting to high fixed network charges rests on the assumption that passive households with batteries will eventually respond to price signals. The data suggest they are not doing so.⁴ The finding comes as the Albanese government pushes the biggest single expansion of the NEM on record. The Capacity Investment Scheme’s Tender 7 selected 19 new renewable projects that collectively add 7.8 GW of generation and 7.9 GWh of battery storage.¹ Those projects are meant to unlock an estimated $17 billion in private investment and create 19,000 construction jobs. More than $257 million worth of Australian steel is committed to the build-out.¹ But the supply-side numbers tell only part of the story. On the consumer side, the mismatch between policy assumptions and actual household behaviour is widening. Utility-scale solar and wind output hit 4.7 TWh in a single month in March 2026, a record for the NEM.² Large-scale renewables are no longer a fringe source — they are the dominant supply stack during daylight hours. Yet when the sun fades, the system depends on batteries. And about 90% of the residential batteries already installed operate outside any dispatch control. They charge and discharge on owner-set schedules, not in response to wholesale price signals.⁴ Wind and solar farms currently have to curtail output at times of high generation and low demand, a problem the government expects new storage to solve.³ But if most home batteries remain unresponsive to market signals, a large chunk of the distributed storage fleet will not be available when the grid needs it most. Energy Minister Chris Bowen frames the Tender 7 package as a transformational step. “The Albanese Government is backing the biggest single boost to Australia's main electricity grid,” he said.¹ Almost $1.2 billion in social licence commitments will fund local community programs and First Nations participation.¹ Those commitments are real. But they do not address the grid operator’s operational forecasting problem. AEMO’s modelling explicitly warns that the passive benefit — the value that accrues to the system even from unresponsive batteries — must be captured to avoid over-investing in fixed network costs that households will never recoup.⁴ The policy tension is stark. The same government that funds giant grid-scale batteries also pays nearly $17 billion to build more renewable capacity, while the Distributed Energy Resources that could shave peak demand stay disconnected from the market. Tender 9, which will target 5 GW of renewable generation and is open to all NEM jurisdictions except New South Wales, is already being designed.¹ NSW proponents can instead participate in restarted state generation tenders.¹ The next real test will be this summer, when the first of the Tender 7 batteries come online. If wholesale prices spike during evening peaks and the residential battery fleet remains idle, the gap between the policy vision and household reality will become a pricing event.