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1933 The Tummel Scheme was constructed the Rannoch power house; it uses Loch Rannoch as a water storage area. The outlet to Loch Rannoch is the River Tummel; the water passes down the river to the reservoir formed by the intake dam about 5 miles down the River Tummel. On the south bank water is taken off through screens into the Tummel Aqueduct which follows a contour along the hillside for a distance of about three miles.
Before entering the power house each pipe line is provided with a Venturi pipe for measuring the flow. The head is 170 feet and there are two horizontal generating sets each of 24,000 h.p. generating current at 11,000 volts, 50 cycles per second, three phase at 300 r.p.m.