Lake Margaret Power Station
| Lake Margaret Dam | |
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The control room from the former power station, in June 2006. The power station is now operated remotely.
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 Location of the Lake Margaret Dam in Tasmania
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| Country | Australia |
| Location | Western Tasmania |
| Coordinates | 41°59′24″S 145°34′48″E / 41.99000°S 145.58000°ECoordinates: 41°59′24″S 145°34′48″E / 41.99000°S 145.58000°E |
| Purpose | Power |
| Status | Operational |
| Construction began | 1914 |
| Opening date | 1918 |
| Owner(s) | Hydro Tasmania |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Yolande River |
| Height | 17 metres (56 ft) |
| Length | 243 metres (797 ft) |
| Dam volume | 6×103 m3 (210×103 cu ft) |
| Spillways | 1 |
| Spillway type | Uncontrolled |
| Spillway capacity | 29 m3/s (1,000 cu ft/s) |
| Reservoir | |
| Creates | Lake Margaret |
| Total capacity | 15,374 megalitres (542.9×106 cu ft) |
| Catchment area | 21 square kilometres (8.1 sq mi) |
| Surface area | 15.83 hectares (39.1 acres) |
| Lake Margaret Power Station | |
| Coordinates | 41°59′24″S 145°34′48″E / 41.99000°S 145.58000°E |
| Operator(s) | Hydro Tasmania |
| Commission date |
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| Decommission date | 2006 (A-G) |
| Type |
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| Hydraulic head | 325 metres (1,066 ft) |
| Turbines |
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| Installed capacity | 8.4 megawatts (11,300 hp) |
| Annual generation | 69 gigawatt-hours (250 TJ) |
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Website hydro |
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The Lake Margaret Power Stations comprise two hydroelectric power stations located in Western Tasmania, Australia. The power stations are part of the King – Yolande Power Scheme and are owned and operated by Hydro Tasmania. Officially the Upper Lake Margaret Power Station, a conventional hydroelectric power station, and the Lower Lake Margaret Power Station, a mini-hydroelectric power station, the stations are generally collectively referred to in the singular format as the Lake Margaret Power Station. The stations are located approximately 2.5 kilometres (1.6 mi) apart.
The Upper Lake Margaret Power Station was constructed by the Mount Lyell Mining and Railway Company between 1911 and 1914. In 1984, the station was sold to the Tasmanian Hydro-Electric Commission and was officially decommissioned in 2006 and after a multi-million dollar refit was recommissioned in 2009. The Lower Lake Margaret Power Station was built also by the Mount Lyell Mining and Railway Company in 1931 and decommissioned in 1995. After the implementation of a mini-hydro project in 2009, the project was recommissioned in 2010.
Part of the King – Yolande scheme that comprises three hydroelectric power stations, the Lake Margaret Power Stations utilise water from the naturally-forming Lake Margaret which was dammed in 1914 to increase the storage volume and head. A key feature of the development is a 2.2-kilometre (1.4 mi)-long woodstave pipeline which connects the dam to a steel which feeds the power station. In 2009 a new pipeline of Alaskan Yellow Cedar replaced the native King Billy Pine pipeline constructed in 1937.
The upper power station was recommissioned in 2009 by Hydro Tasmania and has six 1.2-megawatt (1,600 hp) Boving Pelton-type turbines and one 1.2-megawatt (1,600 hp) James Gordon Pelton-type turbine with a combined generating capacity of 8.4 megawatts (11,300 hp) of electricity. Within the station building, each of the seven horizontal axis turbines are connected to open wheel generators. The first four machines were installed in 1914. Two more were added in 1918 and a seventh machine was added in 1930. Each turbine is fitted with a motorised inlet valve. The generators are connected to individual machine circuit breakers which are connected to circuit breakers for each of the four transmission circuits contained in a split bus. The station output is estimated to be 48 gigawatt-hours (170 TJ) annually.
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Wikipedia