Alinta Energy officially announced on October 22, 2026, its decision to abandon the $1.8 billion Oven Mountain Pumped Hydro project in northern New South Wales, Australia. The company attributed the cancellation to "economic and timing challenges on key elements of the project, including a critical transmission line," which it stated rendered the initiative unviable.

This decision halts a significant renewable energy development that aimed to power over 600,000 homes, highlighting persistent hurdles for large-scale green infrastructure in Australia. The cancellation impacts regional economic prospects and potential employment opportunities, affecting local communities in New South Wales.

What the Records Show

The Oven Mountain Pumped Hydro Energy Storage project was planned as a 900-megawatt (MW) facility with a storage capacity of 7.2 gigawatt-hours (GWh). Located near Georges Junction, approximately 60 kilometers southeast of Armidale, the project was situated within the New England Renewable Energy Zone. It was designed to provide up to 12 hours of energy storage, or 8 hours of dispatchable energy at full generation. The NSW Government had declared the project "Critical State Significant Infrastructure" (CSSI) in September or October 2020, suggesting an expedited planning pathway. The initial estimated cost was around $1.8 billion, later amended to $1.97 billion. The NSW Government had also provided $10 million to the project through its Pumped Hydro Recoverable Grants Program. The facility was intended to connect to an existing Transgrid transmission line, Line 965, running between Kempsey and Armidale, requiring infrastructure such as a substation and 330 kV transmission lines.

The Timeline

The project moved through several development stages. The NSW Government designated it Critical State Significant Infrastructure in late 2020. Alinta Energy submitted a Scoping Report in January 2021, and the NSW Government subsequently issued the Secretary's Environmental Assessment Requirements (SEARs) in February 2021. Roughly two years before its cancellation, Alinta Energy engaged Malaysia's Gamuda and Spain's Ferrovial Construction as Early Contractor Involvement partners to advance the design.

What Changed and For Whom

Alinta Energy cited