In 1943, only one in a hundred crofts in the Scottish Highlands had access to an electricity supply. This would rapidly change in just a few decades thanks to affordable electricity produced by hydropower stations. One of Scotland’s earliest hydropower plants was the Tummel Bridge Power Station, which was completed in 1933. The Tummel Valley collects water from 1,800 square kilometers (690 sq mi) of the Grampian Mountains, with Tummel Bridge Hydro Power Station receiving water from Dunalastair Reservoir and discharging into Loch Tummel. Water travels by aqueduct and pipeline approximately…