SSE has submitted plans to the Scottish Government for the 100MW Sloy pumped storage hydro scheme.
The plans would see the existing Sloy Power Station – a conventional hydro power station – on the banks of Loch Lomond converted into a pumped storage hydro scheme with a pumping capacity of up to 100MW.
If given the green light, the converted Sloy scheme would be capable of delivering up to 16GWh of long-duration electricity storage capacity.
SSE has submitted a Section 36 planning application to Scottish Government ministers to convert the iconic Sloy Power Station into the new pumped hydro scheme.
Subject to a positive consenting outcome, SSE Renewables hopes to make a final investment decision about Sloy in late 2027 and to fully adapt and commission the new pumped storage scheme by the end of 2030.
As part of the planning application, SSE Renewables is also proposing to upgrade the existing 32.5MW G4 turbine to match its sister units, which would increase the station’s generating output by 7.5MW to 160MW.
During the design, development and construction phases, the proposed conversion could support up to 70 full-time equivalent (FTE) jobs, helping to boost the local economy and employment.
A dedicated community benefit fund would also be established, in addition to the recently launched £10m Hydro Community Fund.
Robert Bryce, Director of Hydro – SSE Renewables, said: “The proposed pumped storage hydro scheme will play an important role in the UK Government’s Clean Power by 2030 ambitions, providing firm, flexible renewable energy for up to 100 hours non-stop at the flick of a switch.
“The existing Sloy Power Station has been operational since 1950 and over the past seven decades has played a significant role in our energy system.
“The new proposals will ensure this remains an important asset for decades to come.
“If consented, the scheme will provide an economic and employment boost to the local area and help provide balance to our increasingly renewables-led grid, during times of peak demand.
“This latest proposal, alongside our other investments in the technology, are a further example of the importance of hydro as a key part of a homegrown UK energy system.”
Sloy Power Station is Britain’s largest conventional hydro power plant and has been in operation since 1950.