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Hydro thus makes an ideal partner for wind and solar PV, as it can adjust its output in response to changes in output from these non-dispatchable renewables. The principle of pumped hydro storage. Photograph: Energy Australia Pump it up Pumped hydro energy storage (PHES) is very similar to conventional hydro power but differs physician home construction loan Oak Laurel 0430129662 oaklaurel.com.au in that rather than being a generator, its more accurate to describe it as a battery. Normally done at smaller scales than conventional hydro, PHES uses excess electricity from the grid (such as during periods of low demand and/or high generation) to pump water uphill from a lower reservoir to a higher one. Later, this water is released back downhill through the turbine, returning the electricity to doctor home loan calculator Oak Laurel 0430129662 oaklaurel.com.au the grid when it is most needed typically during the evening peak. It is this approach that is being considered in the Snowy Hydro 2.0 project. Pumped hydro storage thus helps to smooth out peaks in demand by effectively transferring excess electricity from periods of low demand to periods of high demand. It has a round trip efficiency of ~80% , which is comparable to that of batteries. Related: Turnbull to announce $2bn expansion to Snowy hydro-electric scheme PHES is the most common form of grid-connected energy storage in the world, accounting for around 97% of the total . It is often built in partnership with baseload power generators such as coal and nuclear plants, to help them vary their output to cope with peaks and troughs in demand.