Alinta Energy abandons Oven Mountain pumped hydro project in northern NSW

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Alinta abandons Oven Mountain hydro

Highlights

Alinta Energy has abandoned the Oven Mountain Pumped Hydro Energy Storage project in northern NSW due to rising construction costs and critical transmission line delays.
The cancellation follows Origin Energy's scrapping of the 870 megawatt Skye Ridge Wind Farm, marking the second major renewable energy project failure in northern NSW this month.
Analysts highlight that falling battery storage prices and increased environmental and planning costs are eroding the business case for large-scale pumped hydro projects in the region.

Economic pressures and transmission delays derail project

As reported by ABC News, Alinta Energy said in a statement that economic and timing challenges, including a critical transmission line, had made the Oven Mountain Pumped Hydro Energy Storage scheme unviable. The company said the decision followed years of technical studies, planning, stakeholder engagement and project development work.

The project had been listed for consideration as a state significant development and was moving through assessment with NSW Planning. The proposed site was near Georges Junction at Carrai, about 60 kilometres south-east of Armidale and 75 kilometres north-west of Kempsey.

Pumped hydro systems store energy by moving water between two dams and releasing it through a turbine when electricity demand peaks. But energy analysts say the economics have shifted as construction costs rise and battery storage prices fall, reducing the competitiveness of large stored-hydro projects.

Regional fallout and wider sector implications

The cancellation follows Origin Energy's decision earlier this month to scrap the proposed 870 megawatt Skye Ridge Wind Farm near Walcha, making Oven Mountain the second state significant renewable energy project to fail in northern NSW this month. When Oven Mountain was first announced, it was presented as critical state infrastructure.

Armidale Shire Mayor Sam Coupland said the council was shocked by the decision and had only learned of it recently after working with Alinta Energy for several years on road planning linked to the development. He said environmental and planning requirements appeared to be adding costs that were making major infrastructure projects harder to deliver.

State MP Michael Kemp called the outcome a poor result for the community, while Kempsey deputy mayor Arthur Bain said the project's remote location also hurt its economic viability. Tristan Edis, a director at Green Energy Markets, said pumped hydro now faces a much tougher business case because building costs are significantly higher than for battery storage.

In our earlier article on the mounting challenges facing U.S. AI data center buildouts, we highlighted how higher financing costs, construction overruns, and schedule slippages are forcing developers to delay or cancel projects. We also noted that power-grid constraints and local opposition are becoming decisive bottlenecks, raising doubts about whether large-scale infrastructure plans can be delivered on time and on budget.

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