Hydro Tasmania’s ambitious pumped hydro project is back in the spotlight, reigniting debates over renewable energy and environmental impact. But here’s where it gets controversial: after a seven-year journey, the 750-megawatt (MW) Cethana project—part of the company’s ‘Battery of the Nation’ plan—has been resubmitted for Environmental Protection and Biodiversity Conservation (EPBC) approval following significant expansion. This isn’t just a bureaucratic update; it’s a pivotal moment for Australia’s renewable energy future and a test of balancing progress with preservation.
First unveiled in 2019 alongside two other pumped hydro proposals, the Cethana project aims to provide 20 hours of energy storage, supporting Tasmania and Victoria’s transition to variable renewable sources like wind and solar. However, the path hasn’t been smooth. After a swift EPBC assessment in 2023, the project was withdrawn in early 2025, only to resurface now with revised plans. Why? New geotechnical and engineering work has expanded the project’s footprint, necessitating a fresh EPBC referral. And this is the part most people miss: the original plans were significantly smaller in scope, as seen in Hydro Tasmania’s side-by-side comparisons.
The project’s complexity is twofold. First, it’s part of the Mersey Forth Hydropower Scheme, designed to integrate with the future Marinus Link undersea cable. Second, its environmental implications are profound. A section of the transmission line will cut through the Mount Roland Regional Reserve, requiring approval from the state parks authority. Meanwhile, the state Environmental Protection Authority (EPA) is subjecting it to a rigorous assessment process typically reserved for large, high-profile projects.
Here’s the crux: the project will clear up to 335.5 hectares of native vegetation, including wet and dry eucalypt forests, highland Poa grasslands, and rare plant species. It will also alter Lake Cethana’s functionality, serving as the lower storage while a new off-river upper storage is built on the nearby plateau. Boldly put, this isn’t just about energy—it’s about reshaping ecosystems. Potential habitats for the Tasmanian devil and spotted-tail quoll are at risk, and acid-forming materials in spoil stockpiles could be exposed. Four flora and seven fauna species protected under Tasmania’s Threatened Species Protection Act are found in the area, adding another layer of complexity.
While seven years might seem like a long time to reach this stage, Hydro Tasmania’s timeline reveals a meticulous process. Between 2019 and 2022, the company engaged with communities, conducted pre-feasibility and feasibility studies, and ramped up activities—only to be sent back to the drawing board with revised engineering plans. But here’s the question: Is this delay a sign of thoroughness or a symptom of overregulation? And at what cost—environmental or economic—should we pursue renewable energy?
As the project moves forward, it’s clear that the Cethana pumped hydro initiative is more than just infrastructure; it’s a litmus test for Australia’s commitment to renewables and its ability to navigate environmental trade-offs. What do you think? Is this project a necessary step toward a greener future, or does it sacrifice too much in the process? Let’s spark the conversation in the comments below.
