SSE Renewables has unveiled plans to convert its Sloy Power Station into a new pumped hydro storage facility.
It said the conversion of the 152.5MW plant would bolster energy security and help provide the large-scale and flexible renewable energy back-up needed in a future UK net zero power system.
As Britain transitions to a net zero power system, the development of additional pumped hydro storage projects will be crucial for energy security back-up and for balancing a renewables-led energy system during periods when the wind doesn’t blow and the sun doesn’t shine, SSE said.
Subject to final design, the converted Sloy scheme would be capable of delivering up to 25GWh of long-duration electricity storage capacity.
At the flick of a switch, the converted Sloy scheme could provide firm, flexible renewable energy for up to 160 hours non-stop, enough to power around 90,000 homes for up to one week.
Finlay McCutcheon, director of onshore Europe at SSE Renewables, said: “We’re delighted to announce new redevelopment plans for our landmark Sloy Power Station, especially as we mark the 80th Anniversary of Hydro Power’s contribution to homegrown power supply in Scotland and Britain.
“In converting our existing Sloy conventional hydro power plant to a pumped hydro storage facility, we can provide the additional large-scale, long-duration electricity storage we need as part of the country’s future energy mix.
“With up to 25GWh of storage capacity, the scheme would be capable of powering 90,000 homes for an entire week, so bolstering our energy security and providing the balancing flexibility we need in a renewables-led energy system.
“The development of pumping capability at Sloy also complements our development plans for our other pumped hydro storage project at Coire Glas.
“Taken together and if approved for delivery, Coire Glas and Sloy can treble Britain’s current flexible electricity storage capacity.
“That’s why it’s crucial the UK Government urgently confirms its intention on exactly how they will help facilitate the deployment of pumped hydro storage projects as part of our future energy mix.”