Engadine power plants

Engadiner Kraftwerke AG
legal form	Corporation
ISIN	CH0022972209
founding	1954
Seat	Zernez , Switzerland
management	Michael Roth (Director)
Number of employees	48
sales	59.3 million CHF (2018/19)
Branch	power supply
Website	www.ekwstrom.ch

Engadine power plants
Central Pradella
location
Canton of Graubünden , Switzerland
Coordinates	820942  /  187788
country	Switzerland  Valais
Waters	Lago di Livigno Lai dad Ova Spin Inn Smaller waters: Sampuoir , Clemgia , Tantermozza , Assa , Varusch, Vallember
Data
Type	three-stage storage power plant group with one pumped storage stage
Primary energy	water
power	(Turbine output ) Total output : turbine : 442 MW pump: 52 MW Centers: Ova Spin: 54 MW P) Pradella: 300 MW S) Martina: 84 MW S) P) Pumped storage power plant S) Storage power plant Doping centers: Punt dal Gall: 2.8 MW D) Ova Spin: 0.5 MW D) Pradella: 1.0 MW D)
owner	Alpiq Suisse : 22% Axpo Power : 5% Axpo Solutions : 15% BKW Energie : 30% CKW : 10% Canton of Graubünden 14% Municipalities 4%
operator	Engadiner Kraftwerke AG
Project start	1954
Start of operations	Ova Spin: 1970 Pradella: 1970 Martina: 1994
turbine	Punt dal Gall: 2 × Francis turbines Ova Spin: 2 × Francis pump turbines 1 × Francis turbine Pradella: 4 × Francis turbines Martina: 2 × Francis turbines
Energy fed in 2019	Total: 1416 GWh Central: Punt dal Gall: 5.5 GWh Ova Spin: 87 GWh P) Ova Spin: 1.6 GWh D) Pradella: 1020 GWh Pradella: 2.5 GWh D) Martina: 299 GWh
was standing	January 1, 2020

The Engadine Kraftwerke AG , abbreviated EKW , Romansh in the Ladin idioms Ouvras Electricas d'Engiadina SA , Italian Officine Elettriche dell'Engiadina SA , French Usines Electriques de l'Engadine SA , is a corporation founded in 1954 Kraftwerksgesellschaft holder and distributor of electricity. The headquarters in Pradella is the hydropower plant with the second largest electricity generation in Switzerland.

Investments

Engadine power plants
Spöl Lake Livigno 1805  m above sea level M. Punt dal Gall (doping KW) 1695  m above sea level M. Inn S-chanf 1650  m above sea level M. Vallember 1663  m above sea level M. Varusch 1655  m above sea level M. Tantermozza 1660  m above sea level M. Ova spin 1592  m above sea level M. Lai dad Ova Spin 1630  m above sea level M. Ova Spin (doping KW) 1577  m above sea level M. Mouth of Spöl Sampuoir 1644  m above sea level M. Clemgia 1281  m above sea level M. Pradella (doping KW) 1134  m above sea level M. Pradella 1138  m above sea level M. Equalization basin Pradell a Assa 1178  m above sea level M. Martina 1036  m above sea level M. Inn

The Lago di Livigno is the head storage of the three power plant levels of the Engadine power plants. The top level Livigno – Ova Spin is designed as a pumped storage power plant and can pump water from the Inn into Lake Livigno, the other two levels Ova Spin – Pradella and Pradella – Martina are designed as storage power plants.

There are 46 km between the S-chanf Inn water intake and the return of the water in Martina . The tunnel system of the power plant group consists of gravity and pressure tunnels , which are 4 to 6 m in diameter and run up to 1,500 m below the surface. The greatest overburden can be found in the area of Piz Clemgia . Several kilometers of the tunnel system cross under the national park.

In addition to the power plants, EKW also operate the Munt-la-Schera tunnel , which serves as access to the Punt dal Gall dam on Lake Livigno and as an entrance to Livigno .

Livigno – Ova Spin level

The Ova Spin headquarters located in the Spölschlucht gorge bears the name of a hamlet on the Ofenpass road. It processes the water from the Lago di Livigno and there in as a balancing reservoir serving Lai dad Ova Spin out. In off- peak times , it can pump the water from the equalization basin back into Lake Livigno. In addition to water from Lake Livigno, it is also filled with water from the Inn , the Ova da Varusch and the Vallember . This water is collected near S-chanf and channeled into the lake via a 15 km long gravity tunnel .

The machine house is located under the overflow of the dam and can only be reached via an access building on the right side of the valley. Two vertical Francis turbines are installed, which can also serve as pumps by using the generator as a drive motor. In pumping mode, the turbines are started by a frequency converter and can be operated at either 375 / min or 500 / min depending on the delivery head, which varies with the level of the lakes. The total installed capacity is 50 MW, both in turbine and pump operation. 100 GWh are produced annually and 49 GWh are required for pumping.

Level Ova Spin – Pradella

The headquarters in Pradella near Scuol is the group's largest power plant. With four vertical Francis turbines, it processes the water from the Lai dad Ova Spin, which is fed in via a 20 km long pressure tunnel. Each machine group has an output of 72 MW, so that the total output is 288 MW. The power plant produces around 1 TWh of energy annually, making it the Swiss hydropower plant with the second largest electricity production. Only the Bieudron power plant, which processes water from the Lac des Dix , generates even more electricity.

The control center for the entire power plant group is also located at the Pradella headquarters, as is the open-air switchgear that connects to the European network . Since the 1990s, combines a 380 kV - high-voltage line Pradella directly with Austria . Another three-pole 380 kV line from Sils im Domleschg coming Albula line also ends there. The Laufenburg electricity company , which, like Engadiner Kraftwerke AG, supplies the Lower Engadine with electricity, has the right to use this energy road .

Level Pradella – Martina

The Martina headquarters is located underground in a cavern near Martina on the border with Austria . It processes the water from the Pradella equalization basin, which is fed in via a 14 km long pressure tunnel. The two machine groups with Francis turbines have a combined output of 70 MW. Around 290 GWh of energy are produced annually.

Plant scheme

Web links

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

• Official website

Individual evidence

1. ↑ Engadiner Kraftwerke AG (Ed.): Annual Report 2018/19 . S. 23 ( ekwstrom.ch [PDF]).
2. ^ Commercial register office of the Canton of Graubünden (ed.): Engadiner Kraftwerke AG CHE-105.768.959 . Commercial register extract. May 10, 2020.
3. ↑ ^{a b} The most important hydropower plants in Switzerland. Federal Office of Energy SFOE, accessed on May 5, 2020 (2019 electricity production: 2201 GWh). 
4. ↑ EKW Engadiner Kraftwerke AG: Headquarters Ova Spin: Engadiner Kraftwerke AG. In: www.ekwstrom.ch. Retrieved October 23, 2016 . 
5. ^ EKW Engadiner Kraftwerke AG: Headquarters Martina: Engadiner Kraftwerke AG. In: www.ekwstrom.ch. Retrieved October 23, 2016 .