Seawater Pumped Hydroelectricity Energy Storage

  • A innovative way of using seawater instead of freshwater for pumped hydroelectricity storage
  • Arup-funded global research project now a feasibility study supported by Federal Government and the Prime Minister’s office
  • Potential reliability and security solution to support base load renewable power in South Australia and elsewhere

Pumped hydroelectricity storage (PHES) using freshwater is the most common form of grid connected energy storage in the world, accounting for around 97% of the total. Due to fresh water constraints Arup in collaboration with Melbourne Energy Institute (MEI) undertook research into using seawater instead, funded by Arup’s Global Research Challenge in 2014.

The study found that as an alternative to using natural valleys, there is potential in Australia to construct artificial reservoirs, known as “turkey-nest” type dams, for PHES service. Further, the study found that coastal seawater PHES, which uses the ocean as the lower reservoir, may have economic application in Australia.

The study identified a number of example sites in South Australia and scoping-level capital cost estimates for seawater “turkey-nest” type PHES facilities could be as low as A$100,000/MWh to A$200,000/MWh.

South Australia has been experiencing energy storage and grid stability problems with state-wide black-outs in late 2016/17. Having seen the research, EnergyAustralia, one of Australia’s largest and oldest gas and electricity supply companies, recognised the potential for this new technology to help solve South Australia’s energy issues. A consortium, including Arup and EnergyAustralia are now undertaking a feasibility study for a PHES project with the support of State and Federal Government, including the Prime Minister’s office.

If the results of the feasibility study are positive, a 100-200 MW PHES may be built on a site near the tip of the Spencer Gulf in South Australia. It would help the South Australian electricity market vary their output in response to changes in demand. Having it connected to PHES allows storage during low demand and additional generation during high demand, allowing the combination of technologies to provide flexible, reliable and cost effective electricity.

It could also mean that more of the ideal renewable wind and solar generation resources can be deployed and tapped to provide renewable energy for the pumping cycle of this grid scale storage technology, further reducing the states carbon footprint.

Share:

  • Pumped hydroelectricity storage (PHES) using freshwater is the most common form of grid connected energy storage in the world.Open gallery

    Pumped hydroelectricity storage (PHES) using freshwater is the most common form of grid connected energy storage in the world.

  • Potential reliability and security solution to support base load renewable power in South Australia and elsewhereOpen gallery

    Potential reliability and security solution to support base load renewable power in South Australia and elsewhere