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PHES can be thought of as a water-based ‘battery’ that can be used to store otherwise surplus renewable generation for later release when it is needed by the energy system.
It is a long-established technology, which typically uses two reservoirs at different elevations.
When there is surplus renewable generation and the price of electricity is low, water can be pumped up to the upper reservoir where it is stored for future use.
It can then be released and flow, by gravity, from the upper to the lower reservoir powering turbines to generate electricity.
The Mutual Energy scheme would differ from this in that Belfast Lough would act as the lower reservoir.
BBC News
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