A new study has revealed that the proposed Cultana pumped hydro energy storage (PHES) facility in South Australia’s Spencer Gulf could generate 225MW with eight hours of storage using seawater.

Conducted by a consortium of Energy Australia, Arup, and Melbourne Energy Institute, the initial feasibility study found that the plant has a potential of 1,770MWh of storage capacity, which is equivalent to more than 126,000 of home batteries.

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

The proposed facility would require an investment of A$477m ($374m) and is said to be economically viable based on several revenue streams.

The study required a total sum of A$1.1m ($86,176), which was contributed to by a A$453,000 ($354,886) fund from ARENA on behalf of the Government of Australia.

“Following engineering design, economical modelling, and planning approvals, the project could be operational by 2023.”

Following engineering design, economical modelling, and planning approvals, the project could be operational by 2023.

ARENA CEO Ivor Frischknecht said: “Pumped hydro is the most established and common form of grid-scale storage, which can capture and harness electricity produced by solar and wind so it is available when needed.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

“We are exploring the potential for pumped hydro across Australia, and the findings of this study are promising for a seawater plant at Cultana.”

Power Technology Excellence Awards - Nominations Closed

Nominations are now closed for the Power Technology Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
Recognised with three 2025 Power Technology Excellence Awards, Hover Energy is at the forefront of intelligent microgrids and distributed renewables. Explore how its AI-enabled Microgrid Management System™ , strategic partnerships and networked microgrids are rebuilding the grid from the ground up for a more flexible, resilient energy future.

Discover the Impact