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Is hydro energy the key to unlocking renewable potential?

by Lauren Cella
November 4, 2016
in Company news, Demand management, Electricity, News, Projects, Renewable Energy, Sustainability, Water
Reading Time: 3 mins read
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The Australian Renewable Energy Agency (ARENA) is providing $449,000 in funding to Australian National University (ANU) to map potential short-term off-river pumped hydro energy storage (STORES) sites which could unlock new pathways for renewable energy.

STORES sites are pairs of reservoirs which are separated by an altitude difference of between 300 – 900m, in hilly terrain, and joined by a pipe. Water is circulated between the upper and lower reservoirs in a closed loop to store and generate power.

ANU is partnering with ElectraNet and VTara Energy Group to conduct the Atlas of Pumped Hydro Energy Storage Study and develop a blueprint and cost-model to integrate the technology into the electricity grid on national, state and regional levels.

ARENA CEO, Ivor Frischknecht, said the study could be the key to unlocking cost-effective large-scale energy storage that can stabilise high levels of renewable energy in Australia’s energy grid.

“This study will help us see just how cheap, efficient and effective pumped hydro systems can be in providing large-scale, reliable, clean energy storage that can feed into the grid on demand, in a range of suitable locations across Australia,” Mr Frischknecht said.

“The approach uses surplus energy to pump water uphill to a storage reservoir. This water can then be released downhill to generate electricity on demand.

“Whilst there been a recent focus on energy storage technologies such as batteries and solar thermal, the vast majority of existing large-scale energy storage comes from large on-river hydroelectric dams, such as those in Tasmania and the Snowy Mountains.

“There is limited potential for further large-scale hydroelectric systems to be installed in Australia; however there are potentially hundreds of smaller, environmentally suitable, off-river STORES scale sites.”

ANU Professor Andrew Blakers said the low cost and technical maturity of STORES could allow solar photovoltaic and wind energy to reliably reach penetration levels above 50 per cent and push towards 100 per cent renewables.

“Water is constantly flowing between the reservoirs to balance supply and demand, and STORES has the potential to support grid stability through inertial spinning reserve and very fast ramp rates from zero to 100 per cent in minutes,” Professor Blakers said.

“South Australia has one possible STORES site with an altitude difference of up to 600m in the hills to the east of Spencers Gulf. This site could support the development of solar and wind resources in the area.”

Chairman and CEO of VTara Energy Group, Dr Clive Stephens, said energy storage is increasing in importance as renewable energy penetration increases.

“Pumped hydro is the cheapest form of large scale storage. Off-river pumped hydro can support the electricity network and can be co-located with wind and solar for added benefits,” Dr Stephens said.

The study is expected to be completed in June 2018.

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