<P> The Loch Sloy Hydro - Electric Scheme is situated on the west bank of Loch Lomond . The facility is operated by Scottish and Southern Energy, and is normally in standby mode, ready to generate electricity to meet sudden peaks in demand . It is the largest conventional hydro electric power station in the UK, with an installed capacity of 152.5 MW, and can reach full - capacity within 5 minutes from a standing start . The hydraulic head between Loch Sloy and the outflow into Loch Lomond at Inveruglas is 277 m . </P> <P> The loch is featured in a well - known song which was first published around 1841 . The chorus is: </P> <Dl> <Dd> Oh, ye'll tak the high road, and I'll tak the low road, </Dd> <Dd> And I'll be in Scotland afore ye; </Dd> <Dd> But me and my true love will never meet again </Dd> <Dd> On the bonnie, bonnie banks o' Loch Lomond . </Dd> </Dl> <Dd> Oh, ye'll tak the high road, and I'll tak the low road, </Dd>

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