SSE is marking 75 years of operation at Sloy Power Station, a landmark of Scottish engineering and the largest traditional hydroelectric facility in the UK.

With generating capacity of 152.5 MW, the station produces around 130,000 MWh of clean energy annually and can ramp unto full generation in less than five minutes, offering vital flexibility to the national grid.

Built between 1945 and 1950 under the Hydro Electric Development (Scotland) Act 1943, Sloy was a remarkable post-War engineering achievement. Water from Loch Sloy travels through a 3 km tunnel under Ben Vorlich before descending four high-pressure steel pipelines to the generating hall at Inveruglas Bay on Loch Lomond.

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Gillian O'Reilly, SSE Head of Heritage, said: "For 75 years, Sloy has been at the heart of Scotland’s hydro heritage, built and maintained by generations of dedicated engineers and operators. As we celebrate this milestone, we honour the people whose skill and commitment have kept the station running and delivering clean, reliable energy. Their work ensures Sloy continues to make a real difference, supporting communities and helping the UK transition to a net zero future."