The Loch Sloy Hyrdro-electric Power Station along Loch Lomond is an impressive piece of engineering. At the top of the hill is the Loch Sloy Dam holding back 9.5 million gallons of water. When emergency electricity is required, the floodgates are opened, sending water down the steel pipes to power the generators. The station opened in 1950 based on the design of James Williamson. It remains the U.K.’s largest hydroelectric plant.