The Trevallyn hydro-electric scheme was built close to Launceston, in northern Tasmania, from 1950 to 1955 to cater for the power needs of a proposed aluminium plant at Bell Bay on the lower Tamar. The development consisted of a dam on the South Esk River, and a power station approximately 415 feet below on the banks of the Tamar River. Water from the dam is directed nearly two miles to the power station through two tunnels joined by a section of surface pipeline across a valley at Marawaylee (now part of the suburb of West Riverside). Metre-gauge railways were used for the construction of the two tunnels. The entire works were situated within five kilometres of the Launceston Post Office.
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