Central Grisons power plants

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Central Grisons power plants
Lai da Marmorera
Lai da Marmorera
location
Central Grisons Power Plants (Canton of Graubünden)
Central Grisons power plants
Coordinates 754833  /  174538
country SwitzerlandSwitzerland Switzerland
canton of Grisonscanton of Grisons Grisons
Waters Albula , Julia , Heidbach
Data
Type three-stage power plant group with storage and run-of- river power plants
Primary energy water
power (Turbine
output ) Total output:
226.4 MW

Central:
Tinizong: 69.5 MW S)
Tiefencastel West: 26 MW L)
Tiefencastel East: 52 MW S)
Solis: 0.2 MW D)
Solis: 7.3 MW L)
Sils: 26 MW L)
Rothenbrunnen: 44 MW S)
Nandrò: 1.6 MW K)
Adont: (planned) K)
Marmorera: (planned) D)
S) Storage power plant
L) Run-of-river power plant
K) Small power plant
D) Doping power plant

Project start 1906
Start of operations 1909
turbine Tinizong: 3 × Pelton turbines
Tiefencastel West:
2 × Francis turbines
Tiefencastel East:
2 × Francis turbines
Solis: 1 × Pelton turbine
Sils: 2 × Francis turbines
Rothenbrunnen: 1 × Francis turbine
Nandrò: 1 × Pelton- Turbine
Adont: 1 × Ossberger-Turbine
Marmorera:
Energy fed in 2018 734.7 GWh
f2

The Mittelbünden power plants is a composite power plant in the canton of Grisons , which is owned by the Municipal Electric Utility Zurich is (EWZ). It consists of six power plants and four reservoirs . The head storage of the power plant group is the Lai da Marmorera .

history

The group's first power station was the Albula power station , which went into operation in December 1909 and supplied the city of Zurich with energy via a 140 km long 47 kV high-voltage line. For the operation of the power plant, the water of the Albula was collected with the weir system Nisellas ⊙ near Alvaschein and led via a 7.3 km long tunnel to the moated castle , from where it reached the headquarters near Sils in Domleschg ⊙ via a 450 m long pressure pipe . The installed capacity at that time was a modest 18 MW. The construction costs amounted to almost 13 million SFr.

In the years 1917 to 1920 the Heidseewerk was built, which is operated with the water from the Heidsee ⊙ and should serve as a supplement to the Albula plant in case of water scarcity in winter. The machine house ⊙ is located below the Solis train station.

In 1949, the went Julia works belonging nacelle Tiefencastel West ⊙ water from the operating, Lai da Burvagn ⊙ processed. 1954 was followed by the Central Tinizong ⊙ which there Marmorera with the water from the 62 million cubic meters of comprehensive Lai ⊙ , the main memory of Julia works is operated. The Tinizong underwater has been processed in tandem by the Tiefencastel Ost ⊙ headquarters since 1970 .

In 1976 a machine house was added in Rothenbrunnen ⊙ , which, like the headquarters in Sils, processes water from the Nisellas weir system. The construction of Rothenbrunnen was necessary because Sils had too little absorption capacity to process the water from all the plants above the Nisellas weir.

In 1983, the fortification Nisellas was canceled and the 1986 put into operation dam Solis ⊙ replaced. The heavy siltation of this 1.5 million m³ reservoir made it necessary to build a diversion tunnel for debris.

The small hydro power plant Nandro ⊙ with a capacity of 1.6 MW uses from 2012 the gap between the water intake of Ava since Nandro to entry into the free-flow tunnel to the surge tank of the Central Tinizong.

A doping power plant with an Ossberger turbine is planned for the dam of the Lai da Marmorera , which processes the residual water to be discharged into the Julia . The order for the delivery of the system was awarded in January 2020, construction of the 1.4 million project will start in the same year. The Adont small hydropower plant was also built, which uses the water from the Adont mountain stream near Riom-Parsonz . The water is drawn at 1740 meters above sea level and fed to a control center at Lai da Burvagn.

The control center of all EWZ power plants is located in Sils. In addition to the Mittelbünden power plants , these include the Bergell power plants , the Wägital power plant and the run-of-river power plants on the Limmat. The Sils Albula substation, which connects the Mittelbünden power plants to the Swissgrid transmission lines and the supply network in Graubünden, is also located at the same location . The EWZ operates its own supply network in Graubünden, which covers around a third of the canton's electricity needs.

System scheme and location map

Central Grisons power plants
Julia
Alp Flix (5 versions) 1707- 2012  m above sea level. M.
Lai da Marmorera
1680  m above sea level M.
Marmorera (doping power plant, planned)
Version Ava da Faller 1,695 m above the sea
Version Ava da Nandrò 1,796 m above the sea
Nandrò 1,719 m above the sea
Moated castle
Tinizong
1200  m above sea level M.
Lai da Burvagn
1116  m above sea level M.
Version Balandegnbach 1133  m above sea level. M.
Version Ava da Mulegn 1120  m above sea level M.
Albula
Tiefencastel East and West
827  m above sea level M.
Solis reservoir
824  m above sea level M.
Solis doping turbine
Heidsee
1484  m above sea level M.
Solos
824  m above sea level M.
Sils (EWZ)
672  m above sea level M.
Hinterrhein
Rothenbrunnen (EWZ)
616  m above sea level M.

Location map power plants Mittelbünden.svg

Pictures of the plant components

  • Tinizong machine house

  • Machine house with the central Tiefencastel West and East

  • Nisellas weir, demolished in 1983

  • Central solos of the Heidseewerk

  • Machine house Sils (EWZ)

Old system schemes

Condition of the systems after the Tinizong machine house was commissioned in 1954, but before Tiefencastel Ost was commissioned in 1970.

  • Location map

  • Length profile

literature

  • W. Kummer: The planned Heidsee plant, a supplement to the Albula power plant in the city of Zurich . In: Schweizerische Bauzeitung . tape 69 , issue 17, April 28, 1917, p. 192-193 , doi : 10.5169 / seals-33868 .
  • The Marmorera-Tinzen power plant project: Excerpt from the directive of the Zurich city council to the municipal council . In: Schweizerische Bauzeitung . Volume 67, issue 40, October 1, 1949, p. 565-570 , doi : 10.5169 / seals-84141 .

Web links

Commons : Kraftwerke Mittelbünden  - Collection of images, videos and audio files

Individual evidence

  1. ^ Department for water management (ed.): The water forces of Switzerland . tape 4 . Bern 1916, Albula power station, p. 246-247 .
  2. ↑ S. Zurlinden: Hundred Years: Pictures from the History of the City of Zurich in the Period from 1814 to 1914 . tape 2 . Report House, Zurich 1915, The Cityscape 1914, p. 388 ( google.ch ).
  3. ↑ Federal Office for Water Management (Ed.): Statistics on hydropower plants in Switzerland . tape 4 . Bern 1928, Heidsee, p. 262-263 .
  4. ↑ Herbert Calvis: The importance of the Rhine in terms of water and energy economics from its sources to the entry into the Rhenish Slate Mountains . Ed .: Herbert Calvis. 1981, p. 84 ( google.ch [accessed on April 28, 2020]).
  5. ↑ City Council of Zurich: Mittelbünden power plants, approval of a property loan of CHF 13,350,000 for the construction of the Nandrò small power plant . Zurich August 20, 2008 ( gemeinderat-zuerich.ch [PDF]).
  6. ↑ Project ID 189579: Doping power plants Marmorera and Löbbia. In: simap.ch. Retrieved April 28, 2020 .
  7. ↑ ewz: Project Small Hydropower Adont. In: ee-news.ch. ewz, January 23, 2012 .;
  8. ↑ EWZ Kraftwerke Mittelbünden. Canton of Graubünden, Office for Energy and Transport, accessed on April 28, 2020 .
  9. ↑ Luca Poroli: EWZ: Sils Albula substation ensures long-term power supply. In: Insidenews. August 7, 2017, accessed on April 28, 2020 (German).