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Butlers Gorge Power Station

Clark Dam
The Clark Dam wall with the Butler Gorge Power Station located at the wall base.
Butlers Gorge Power Station is located in Tasmania
Butlers Gorge Power Station
Location of the Clark Dam in Tasmania
CountryAustralia
LocationCentral Highlands, Tasmania
Coordinates42°15′36″S 146°15′36″E / 42.26000°S 146.26000°E / -42.26000; 146.26000
PurposePower
StatusOperational
Opening date1949 (1949)
Owner(s)Hydro Tasmania
Dam and spillways
Type of damArch dam
ImpoundsUpper River Derwent
Height67 metres (220 ft)
Length378 metres (1,240 ft)
Dam volume159 thousand cubic metres (5.6×10^6 cu ft)
Spillways1
Spillway typeControlled
Spillway capacity687 cubic metres per second (24,300 cu ft/s)
Reservoir
CreatesLake King William
Total capacity539,340 megalitres (19,047×10^6 cu ft)
Catchment area575 square kilometres (222 sq mi)
Surface area4,167.9 hectares (10,299 acres)
Butlers Gorge Power Station
Coordinates42°15′36″S 146°15′36″E / 42.26000°S 146.26000°E / -42.26000; 146.26000
Operator(s)Hydro Tasmania
Commission date1951 (1951)
TypeConventional
Hydraulic head49 metres (161 ft)
Turbines1 x 12.20-megawatt (16,360 hp)
English Electric Francis-type turbine
Installed capacity12.2 megawatts (16,400 hp)
Capacity factor0.8
Annual generation684 gigawatt-hours (2,460 TJ)
Website
hydro.com.au/clean-energy/our-power-stations/derwent
[1]

The Butlers Gorge Power Station is a conventional hydroelectric power station located in the Central Highlands region of Tasmania, Australia.

Technical details

Control room (1953)

Part of the Derwent scheme that comprises eleven hydroelectric power stations, the Butlers Gorge Power Station is the first station in the scheme. The power station is located above ground at the foot of the concrete arched Clark Dam across the River Derwent that forms Lake King William. Water from the lake is fed to the power station, coupled to one of two discharge regulating valves to ensure water flow to Tarraleah Power Station located further downstream.[2][3]

The power station was commissioned in 1951 by the Hydro Electric Corporation (TAS) and officially opened on 22 November 1952. The station has one English Electric Francis turbine, with a generating capacity of 12.2 megawatts (16,400 hp) of electricity. The station building houses a single alternator and the turbine has a fully embedded spiral casing with water flow controlled via a butterfly type valve. It also houses a 125 kVA diesel generator for alternate station services supply when needed. The station output, estimated to be 684 gigawatt-hours (2,460 TJ) annually,[1] is fed to TasNetworks' transmission grid via an 11 kV/110 kV three-phase English Electric generator transformer to the outdoor switchyard.[2]

The water discharged from the Butlers Gorge Power Station flows via three conduits to either Nieterana mini-hydro, Tarraleah Power Station, or to Wally's Weir and back into the Derwent.[3]

Climate

Butlers Gorge has a temperate oceanic climate (Köppen: Cfb), bordering on a subpolar oceanic climate (Köppen: Cfc). Over the period 1957 to 1993, there were on average 27 snow days annually.[4]

Climate data for Butlers Gorge 1991–2020 (extremes 1941–2022)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 34.4
(93.9) 		33.5
(92.3) 		31.9
(89.4) 		25.0
(77.0) 		22.0
(71.6) 		18.3
(64.9) 		16.1
(61.0) 		18.9
(66.0) 		24.4
(75.9) 		26.8
(80.2) 		30.3
(86.5) 		32.7
(90.9) 		34.4
(93.9)
Mean daily maximum °C (°F) 19.3
(66.7) 		19.1
(66.4) 		16.9
(62.4) 		13.5
(56.3) 		10.4
(50.7) 		8.5
(47.3) 		7.7
(45.9) 		8.2
(46.8) 		10.4
(50.7) 		13.5
(56.3) 		15.7
(60.3) 		17.3
(63.1) 		13.4
(56.1)
Mean daily minimum °C (°F) 6.7
(44.1) 		6.2
(43.2) 		5.4
(41.7) 		3.7
(38.7) 		2.1
(35.8) 		0.7
(33.3) 		0.2
(32.4) 		0.2
(32.4) 		1.4
(34.5) 		2.4
(36.3) 		4.4
(39.9) 		5.6
(42.1) 		3.2
(37.8)
Record low °C (°F) −2.8
(27.0) 		−2.5
(27.5) 		−4.4
(24.1) 		−5.7
(21.7) 		−6.7
(19.9) 		−13.0
(8.6) 		−12.5
(9.5) 		−12.2
(10.0) 		−6.5
(20.3) 		−5.7
(21.7) 		−5.5
(22.1) 		−3.3
(26.1) 		−13.0
(8.6)
Average rainfall mm (inches) 90.0
(3.54) 		77.9
(3.07) 		109.6
(4.31) 		132.7
(5.22) 		165.2
(6.50) 		135.8
(5.35) 		186.0
(7.32) 		232.9
(9.17) 		168.6
(6.64) 		152.9
(6.02) 		127.9
(5.04) 		123.0
(4.84) 		1,706.7
(67.19)
Average rainy days 16.1 12.5 17.2 20.8 22.8 22.6 25.0 25.4 23.3 21.5 20.0 18.6 245.8
Source: Bureau of Meteorology (1991–2020 averages;[5] extremes 1941–present)[6]

See also

References

  1. ^ a b "Register of Large Dams in Australia". Dams information. Australian National Committee on Large Dams. 2010. Archived from the original (Excel (requires download)) on 12 December 2013. Retrieved 23 June 2015.
  2. ^ a b "Butlers Gorge Power Station: Technical fact sheet" (PDF). Derwent Catchment. Hydro Tasmania. Archived (PDF) from the original on 15 June 2023. Retrieved 15 June 2023.
  3. ^ a b "Derwent". Energy. Hydro Tasmania. Archived from the original on 19 May 2022. Retrieved 15 June 2023.
  4. ^ Australian Weather News. "Annual snow days sorted in descending order of average occurrence". Australian Weather News. Retrieved 8 December 2022.
  5. ^ "Climate Statistics for Butlers Gorge". Bureau of Meteorology. Retrieved 8 December 2022.
  6. ^ "Climate Statistics for Butlers Gorge". Bureau of Meteorology. Retrieved 8 December 2022.


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