cleuson - dxei nce

CLEUSON - DIXENCEINTRODUCING A HYDROELECTRIC COMPLEX UNIQUE IN THE WORLD

CLEUSON-DIXENCE COMPLEXCONTEXT

3

The original three power plants at Chandoline, Fionnay and Nendaz, with a capacity of 800 MW, take 2200 hours to turbine the 400 million m3 of water stored in the Grande Dixence lake.

To optimise this tremendous potential which represents 20% of the stored energy in Switzerland, the Cleuson-Dixence facility was built to increase the production capacity by 1200 MW to 2000 MW.

This reduces production to approximately 1’000 hours and, when there is a high demand for energy, enables peak power to be provided to the distribution grid.

Cleuson-Dixence produces 2.5 times the power of the Alpiq-Grande Dixence complex.

In 1992, a partnership was founded to build and operate this new facility which cost 1300 million CHF. Alpiq Suisse SA has a 7/22 participation and Grande Dixence SA a 15/22 participation.

FIONNAY PLANT

NENDAZPLANT

BIEUDRONPLANT

CHANDOLINEPLANT

Nendaz

HérémenceMéribé

Plan Désert

Voua

sson

Zerm

att /

Aro

lla

Vex

RHÔNE RIVER

RIVER

PRINTZE

BORGNE RIVER

LA FARA

RIVER

DRAN

SE R

IVER

DIXENCE RIVER

Hérémence Valley

Nendaz Valley

Bagne

s Vall

ey

Hérens Valle

y

Mont Fort

Rosablanche

Pointed’Allèves

Pic d'Artsinol

GrepponBlanc

Mont Rouge

Sion

Dent deNendazMont

Gond

GRANDEDIXENCE

Le Chargeur

TortinTracouet

CLEUSON

CLEUSON-DIXENCE COMPLEXOVERVIEW

FIONNAY PLANT

NENDAZPLANT

BIEUDRONPLANT

CHANDOLINEPLANT

Nendaz

HérémenceMéribé

Plan Désert

Voua

sson

Zerm

att /

Aro

lla

Vex

RHÔNE RIVER

RIVER

PRINTZE

BORGNE RIVER

LA FARA

RIVER

DRAN

SE R

IVER

DIXENCE RIVER

Hérémence Valley

Nendaz Valley

Bagne

s Vall

ey

Hérens Valle

y

Mont Fort

Rosablanche

Pointed’Allèves

Pic d'Artsinol

GrepponBlanc

Mont Rouge

Sion

Dent deNendazMont

Gond

GRANDEDIXENCE

Le Chargeur

TortinTracouet

CLEUSON

5EXISTING FACILITIES

CLEUSON-DIXENCE FACILITY

TEMPORARY CONSTRUCTION CABLE CAR

PRODUCTION PLANTS

DAMS

CLEUSON-DIXENCE COMPLEXMAIN SPECIFICATIONS

7

Constructed entirely underground between 1993 and 1998, the Cleuson-Dixence facility includes the following main components :

1 A new water intake drilled through the Grande Dixence dam at Le Chargeur.

2 A 15.8 km long headrace tunnel from the dam to Tracouet.

3 A surge chamber at Tracouet, excavated in the Dent-de-Nendaz mountainside.

4 A 4.3 km long penstock connecting Tracouet to the Bieudron plant.

5 An underground plant equipped with three vertical generators each fitted with a 423 MW Pelton turbine and a 465 MVA generator.

(By way of comparison, the Gösgen nuclear power plant has an in-stalled power capacity of 970 MW and the Leibstadt plant, 1165 MW).

The energy produced across all the Alpiq-Grande Dixence- Cleuson-Dixence facilities reaches approximately 2000 million kWh per year, which corresponds to the average annual consumption of 400’000 households.

2500 m

R 2.20 m

Casing4.70 m R 2.915 m

Drill hole

5.60 mØ 3.80

mPrecast

segment

Ø 5.26 m

Lining

int. Ø

4.20

m

15'833 m

LOT B

Pressurised headrace gallery


LOT C LOTS D AND FLOT A

Concrete gallery 11’588 m Steel lining 2790 mSteel lining 1455 m

Le Chargeur

Water intake

DIX LAKE

Pte d'Allève

La Grande Arpette

Mont Gond

Tortin Tracouet Bieudron

SURGE CHAMBER

Dent de Nendaz

Penstock

4230 m BIEUDRON PLANT 1,200 MW

3000 m

2000 m

1500 m

1000 m

500 m

RHÔNE

CLEUSON LAKE

Max

. gro

ss h

ead

1883

m

F1

F2

F4

F5

F6

F7

TRACOUET

DZERDJONNA

PÉROUA

CONDÉMINES

4.40

m

4.40 m

R 2.63 m

R 2.40 m

CLEUSON-DIXENCE COMPLEXLONGITUDINAL PROFILE DIAGRAM

2500 m

R 2.20 m

Casing4.70 m R 2.915 m

Drill hole

5.60 mØ 3.80

mPrecast

segment

Ø 5.26 m

Lining

int. Ø

4.20

m

15'833 m

LOT B



LOT C LOTS D AND FLOT A

Concrete gallery 11’588 m Steel lining 2790 mSteel lining 1455 m

Le Chargeur

Water intake

DIX LAKE

Pte d'Allève

La Grande Arpette

Mont Gond


SURGE CHAMBER

Dent de Nendaz

Penstock

4230 m BIEUDRON PLANT 1,200 MW

3000 m

2000 m

1500 m

1000 m

500 m

RHÔNE

CLEUSON LAKE

Max

. gro

ss h

ead

1883

mF1

F2

F4

F5

F6

F7

TRACOUET

DZERDJONNA

PÉROUA

CONDÉMINES

4.40

m

4.40 m

R 2.63 m

R 2.40 m

0 1 2 3 4 5km

9

Access tunnelsF1 F7

Lower carboniferousShaly sandstone"St Christophe" schists

15'833 m

LOT B LOT C LOTS D AND FLOT A

Le Chargeur

DIX LAKE

Pte d'Allève

La Grande Arpette

Mont Gond


SURGE CHAMBER

Dent de Nendaz

Penstock

4230 m BIEUDRONPLANT1200 MW

3000 m

2500 m

2000 m

1500 m

1000 m

500 m

RHÔNE

Max

. gro

ss h

ead

1883

m

Concrete gallery 11'588 m Steel lining 2790 mSteel lining 1455 m



Schist

s of L

ower

Cas

anna

Gre

ensto

ne

Aug

en gn

eiss M

icasc

hists

Schi

sts o

f Upp

er C

asan

na

Ch

loriti

c Mica

schi

sts a

nd G

neiss

Chèq

ues

sync

line

Verr

ucan

o ph

ylitt

ic s

chis

ts

Tria

s bo

rder

Tria

s m

edia

n

Uppe

r car

boni

fero

us

Gra

velly

and

sla

ty s

chis

ts

Low

er c

arbo

nife

rous

Gr

avel

ly an

d sla

ty s

chis

ts

Tria

ssic

sca

le

An

hydr

ite

"L

e Té

légr

aph"

bre

ccia

Dent

de

Nen

daz

seri

es

Chl

oriti

c m

icas

chis

ts

Ph

ylitt

ic s

chis

t Q

uart

zite

TRACOUET

DZERDJONNA

PÉROUA

CONDÉMINES

CLEUSON LAKE

CLEUSON-DIXENCE COMPLEXLONGITUDINAL PROFILE AND GEOLOGY (CROSS SECTIONS)

Lower carboniferousShaly sandstone"St Christophe" schists

15'833 m

LOT B LOT C LOTS D AND FLOT A

Le Chargeur

DIX LAKE

Pte d'Allève

La Grande Arpette

Mont Gond


SURGE CHAMBER

Dent de Nendaz

Penstock

4230 m BIEUDRONPLANT1200 MW

3000 m

2500 m

2000 m

1500 m

1000 m

500 m

RHÔNE

Max

. gro

ss h

ead

1883

m

Concrete gallery 11'588 m Steel lining 2790 mSteel lining 1455 m



Schist

s of L

ower

Cas

anna

Gre

ensto

ne

Aug

en gn

eiss M

icasc

hists

Schi

sts o

f Upp

er C

asan

na

Ch

loriti

c Mica

schi

sts a

nd G

neiss

Chèq

ues

sync

line

Verr

ucan

o ph

ylitt

ic s

chis

ts

Tria

s bo

rder

Tria

s m

edia

n

Uppe

r car

boni

fero

us

Gra

velly

and

sla

ty s

chis

ts

Low

er c

arbo

nife

rous

Gr

avel

ly an

d sla

ty s

chis

ts

Tria

ssic

sca

le

An

hydr

ite

"L

e Té

légr

aph"

bre

ccia

Dent

de

Nen

daz

seri

es

Chl

oriti

c m

icas

chis

ts

Ph

ylitt

ic s

chis

t Q

uart

zite

TRACOUET

DZERDJONNA

PÉROUA

CONDÉMINES

CLEUSON LAKE

2200 m

2364 m

Valve chamber

A

A B

B

A A B B

4.40

m

R 2.20 m

R 2.20 m R 1.90 m

4.40 m

R 1.90 m

0 1 2 3 4 5km

11WATER INTAKE AT LE CHARGEUR (CROSS SECTIONS)

9

10 11

12

13

14 15

16 17

18

19

8

6

1

5

4

7

32

CLEUSON-DIXENCE COMPLEXWATER INTAKE AT LE CHARGEUR (PLAN VIEW)

11

12

13

14

15

16

17

18

19

LOWER STATION FOR TOURIST CABLE CAR

« THE RITZ » HOTEL

EXHIBITION HALL

UPPER STATION FOR TEMPORARY CONSTRUCTION CABLE CAR (2 X 15 TONS)

MAIN DRAWOFF Q = 50 m3/s

PRESSURE REGULATION SHAFT ANDCLEUSON WATER INTRODUCTION

HEADRACE TUNNEL FOR THE CHANDOLINE PLANT Q = 10.5 m3/s

HEADRACE TUNNEL FOR THE FIONNAY PLANT Q = 45 m3/s

ACCESS TUNNEL TO PRESSURE REGULATION SYSTEMS AND VALVES

1

2

3

4

5

6

7

8

9

10

GRANDE DIXENCE DAM, HEIGHT 285 m

NEW WATER INTAKE, 4.40 m DIA., Q = 75 m3/s

GRANDE DIXENCE WATER INTAKE, 3.30 m DIA., Q = 45 m3/s

WATER INTAKE FOR LOW-LEVEL OUTLET

ACCESS TUNNEL TO THE NEW VALVE CHAMBER

NEW VALVE CHAMBER

ACCESS TUNNEL TO THE NEWHEADRACE TUNNEL

HEADRACE TUNNEL LOW POINT

HEADRACE TUNNEL BETWEEN LE CHARGEUR AND TRACOUET, LENGTH 15’833 km

DRAWOFF FOR THE HEADRACE TUNNEL

10

7 8

9 11

23

12

14

1

4

5

611

3

7 8 10 135

9

4

11

2

1

GRADIENT=32%

CHARGEUR

TRACOUET

13

32 TONS OVERHEAD CRANE

WALKWAY

BY-PASS

COUNTERWEIGHT

VALVE BODY, 3.30 m DIA.

SERVOENGINE

UPSTREAM PIPE, 3.30 m DIA.

REMOVABLE PIPE, 3.30 m DIA.

MANHOLE, 600 mm DIA.

VENT, 700 mm DIA.

BASES

INSPECTION WINCH

HEADRACE GALLERY

PENSTOCK INLET

BUTTERFLY VALVE CHAMBERS

8

9

10

11

12

13

14

1

2

3

4

5

6

7

2364 m2384 m

2559.23 m

2449.30 m

DAMPLANT

F4

20.20 m

65.3

0 m

104.

77 m

81.3

4 m

3.29

m

407.00 m

557.00 m7.55 m71.90 m

9.00 m

G=20%

150.00 m

71.90 m

407.00 m

557.00 m

150.00 m

A

A

B BA

A

CC

CLEUSON-DIXENCE COMPLEXSURGE CHAMBER

LONGITUDINAL CROSS SECTION

PLAN VIEW

DIX

ENCE

TRA

COU

ET

ACCESS DOOR

CHAMBER F2

CHAMBER F2

F2

A A

CROSS SECTION A-A CROSS SECTION B-B CROSS SECTION C-C

R 3.81

m

R 3.35 mR 5.1

0 m

R 4.50 m

4.45 m 4.45 m

R 2.

10

R 2.25

R 1.80

4.64

m

3.45 m

CROSS SECTION A-A

15ACCESS TUNNEL TO TORTIN F2

BIEUDRON POWER PLANT

19

Situated close to the Nendaz (Grande Dixence) power plant, the main cavern at Bieudron is over 100 m long, 39 m high and 25 m wide. The plant includes 3 caverns and several connecting tunnels and access tunnels representing an excavated volume of 150’000 m3.

It comprises 3 vertical generators operating at 428 rpm, with :

— 3 spherical valves with a diameter of 1.40 m

— 3 Pelton turbines with a unit power of 423 MW

— 3 x 465 MVA generators with water-cooled rotor windings and stator bars

— 3 x 465 MVA three-phase transformers

— 9 x 230/410 kV one-phase cables supplying power to the 410/230 kV station at Chamoson

The Bieudron power plant alone holds three world records, for : the drop height, the output of the Pelton turbines and the output per ge-nerator pole.

CHAMOSON SWITCHINGSTATION 410/230 kV

CHAMOSON SWITCHINGSTATION 230 kV

BIEUDRON PLANT 1200 MW

NENDAZ PLANT 390 MW

BIEUDRON POWER PLANTPLAN OF LOCATION

21

NENDAZ PLANT, 390 MW

PENSTOCK INLET, 75 m3/s

DISTRIBUTOR, 3 x 25 m3/s

SPHERICAL VALVES CHAMBER

BIEUDRON MACHINES ROOM

BAR TUNNELS

TRANSFORMER CELLS

COOLING WATER RESERVOIR, CAPACITY 21,000 m3

TAILRACE TUNNEL

410 kV CABLES TUNNEL AND ACCESS TO TRANSFORMERS

RESTITUTION WORK TO THE RIVER RHÔNE

CABLE GATEWAY

CHAMOSON SWITCHING STATION (410/230 kV)

CONNECTING TUNNELS

EMERGENCY TUNNEL

VENTILATION TUNNELS

ACCESS TUNNELS

COMMAND AND CONTROL SYSTEM FOR SWITCHING STATION

AUTO-TRANSFORMER (600 MVA/230/410 kV)

10

11

12

13

14

15

16

17

18

19

1

2

3

4

5

6

7

8

9

2021

22

23

23

23

24

26

27

25

19

18

11

12

17

16

9

9

7

6

15

15

14

5

10

4

3

14

1

8

2

13

BIEUDRON POWER PLANTOVERVIEW

2021

22

23

23

23

24

26

27

25

19

18

11

12

17

16

9

9

7

6

15

15

14

5

10

4

3

14

1

8

2

13

23PENSTOCK

DISTRIBUTOR

UNIT BRANCH (25 m3/s, PRESSURE 190 BAR)

VALVES CHAMBER

SPHERICAL VALVE (210 TONS PER UNIT)

MAIN CAVERN

423 MW PELTON TURBINE

465 MVA GENERATOR

CONTROL ROOM


BUSBAR TUNNELS

21 kV 15’000 A BUSBARS

TRANSFORMER CELL

465 MVA THREE-PHASE TRANSFORMERS

230/410 kV ONE-PHASE CABLE OUTLET

TAILWATER BRANCH

MAINTENANCE AND STORAGE BUILDING

COOLING WATER RESERVOIR

16/0.4 kV AUXILIARY TRANSFORMERS

230/400 V SWITCHBOARDS

EMERGENCY TUNNEL

ASSEMBLY SITE

CONNECTING TUNNELS

ACCESS TUNNEL TO PLANT

ACCESS TUNNEL TO DISTRIBUTOR

TUNNEL FOR 410 kV CABLES AND ACCESS TO TRANSFORMERS

VENTILATION TUNNEL

15

16

17

18

19

20

21

22

23

24

25

26

27

1

2

3

4

5

6

7

8

9

10

11

12

13

14

9

10

8

6

1

5

4

7

3

2

BIEUDRON POWER PLANT SPHERICAL VALVE

1

2

3

4

5

6

7

8

9

10

11

GATE VALVE WITH BEARINGS

BODY OF THE VALVE

COVERS

BEARING BUSHES

UPSTREAM PIPE

DOWNSTREAM REMOVABLE PIPE

RECONDITIONING JOINT

SERVICE JOINT

SERVOENGINE

SERVOENGINE LEVER


9

10

8

6

1

5

4

7

3

2

6

11

5

25

103 m

25 m

UNIT 1 UNIT 2 UNIT 3

ASSEMBLYSITE

25 m

39 m

BIEUDRON POWER PLANT LONGITUDINAL CROSS SECTION

103 m

25 m

UNIT 1 UNIT 2 UNIT 3

ASSEMBLYSITE

25 m

39 m

27

43 m 46 m25 m

1

2

4

6

5

5

7

8 9

10

11

3

BIEUDRON POWER PLANTTRANSVERSE CROSS SECTION

43 m 46 m25 m

1

2

4

6

5

5

7

8 9

10

11

3

291

2

3

4

5

6

7

8

9

10

11

DISTRIBUTOR

VALVES CHAMBER


MACHINES ROOM

TUNNEL FOR LOW AND MEDIUM VOLTAGE CABLES

LOW WATER TUNNEL

BAR TUNNEL

FLAP GATE

TAILWATER BRANCH

TRANSFORMER CELLS

TAILRACE

9

6

4

7

582

3

1

BIEUDRON POWER PLANTTRANSFORMER

1

2

3

4

5

6

7

8

9

BUSBAR INPUT

THREE PHASE TRANSFORMER465 MVA - 21 kV/410 kV

CABLE-TRANSFORMER SF6 CONNECTION

230/410 kV CABLES

CABLE SUPPORTS

VENTILATION

CABLE GALLERY

CO2 FIRE PROTECTION

SMOKE EXTRACTION

XLPE INSULATION

COPPER CONDUCTOR

NON-INFLAMMPE SHEATH

CORRUGATEDALUMINIUM SHEATH

140 mm

Weight 32 kg/m

BAR SUPPORT

SHEATH

OCTOGONAL CONDUCTOR

1100 mm

31230/410 kV CABLE

21 kV BUSBAR CROSS SECTION

1

2

11

9

10

8

5

6

7

4

3

BIEUDRON POWER PLANTTURBINE-GENERATOR UNIT

GENERATOR SHAFT

EXCITER

ROTOR – COOLING WATER

ROTOR

STATOR

TURBINE GUIDE BEARING

PELTON TURBINE

RACK AND PLATFORM

INJECTOR

BUSBARS

COMBINED TRUST ANDBEARING SUPPORT

7

8

9

10

11

1

2

3

4

5

6

33

ROLE OF COMMAND AND CONTROL SYSTEM

— Automatically control all components in the power plant, locally or remotely from the Alpiq control centre

— Guarantee maximum safety of individuals and property— Ensure the optimum availability of production generators

GENERAL SPECIFICATIONS OF THE COMMAND AND CONTROL SYSTEM

Division into decentralised elementary systems each including :

— A direct mode or local service— An automatic mode, local or remote control— Control panels— Redundant automated devices

Number of elementary systems :

— 12 systems for general power plant operations and headgates— 18 systems for each unit Total systems across facility :

— 85 CPUs— approx. 8000 digital inputs— approx. 8500 digital outputs— approx. 500 analogue inputs— approx. 100 analogue outputs

COMMAND AND CONTROL SYSTEM

PENSTOCK REHABILITATION WORK

RHÔNEBIEUDRON

1714.63

1713.97

2156.90

1485.531416.16 1280.95

481.00

2000 m

1500 m

1000 m

500 m450.00

Upper Fontanettes

BY-PASS

F4 TRACOUET

F5 DZERDJONNA

F6 PÉROUA

F7 CONDÉMINES

1413.98

1207.85 Lower Fontanettes

37Following the rupture of the Cleuson-Dixence penstock on 12th De-cember 2000, EOS Holding and Grande Dixence SA, the owners of the facility, decided to set up a company in 2003 to plan and manage the rehabilitation works.

Based on consultation and advice from an international panel of experts, Cleuson-Dixence Construction SA has studied several reha-bilitation schemes : repair of the current penstock, lining, alternative solutions comprising new deep or semi-deep wells, open air penstocks and combination scenarios.

The solution which appeared to be the most suitable, both in terms of feasibility and high level of safety, was to line the inside of the penstock.

The « old » shielding provides a seal for the new lining against the groundwater and no longer plays a structural role. The total cost of rehabilitation was 365 million CHF.

Access tunnelsF4 F7

Upper Fontanettes windowL = -340 m

Lower Fontanettes windowL = -126 m

Site platformAlt. 1263 m

Chamber at head of vertical penstock

Site platformAlt. 1205 m

68.2

0 m

6.50

m9.

50 m

13.15 m

Concrete conduit

Lining of existing conduit

Section of abandoned penstock/

Concreting/

Filling of existing conduit

Conduit laid on platesVert

ical

pen

stoc

k

40 m33 m

Chamber at foot of bypass

Lining of existing conduit

1200 m

1220 m

1240 m

1260 m

1280 m

1340 m

1320 m

1300 m

Chamber at foot of vertical penstock

Access tunnel at foot of verticalpenstock

PENSTOCK REHABILITATION WORKDESCRIPTION OF THE VARIOUS OPERATIONS

BY-PASS : LONGITUDINAL PROFILE

Ø2.85

m

NEW LINING

PACKING MORTAR 130 mm THICK

PREFABRICATED SEGMENTAL RINGS 300 mm THICK

CONCRETE FILLING 400 mm THICK

CONCRETE FILLING 130 mm THICK

EXISTING LINING INT. DIA. 3.20 m

SERVICE-PIPES INT. DIA. 5’’ FOR CONTROLCOMMAND AND ELECTRICITY

WATER

39LINING : CROSS SECTION

The first work started in 2005. The entire length Tracouet – Dzerdjonna – Péroua – Condémines – Bieudron was rehabilitated.Outside the area affected by the accident, the repair was done by lining the penstock. This means that a new steel tube was inserted inside the existing penstock. In total, 400 pipes, 12’500 tons of steel and 16’400 m of welds were required to create the lining.

In the area where the accident occurred, a workaround solution using a deep by-pass was adopted. The damaged section of the penstock, a length of 117 m, was filled.

Two additional acces tunnels were excavated upstream and downstream of the damage section, to create the access points required for the construction of the bypass. Lining was carried out using steels with a high elastic limit, selected to optimise the quality and performance of the work.

To minimize head loss, the space separating the old penstock from the lining was reduced to the minimum (approximately 10 to 15 cm). This space was filled with concrete.

The commissioning tests for the Cleuson-Dixence facility started in the middle of 2009 and the Bieudron power plant produced its first kilowatt-hours in January 2010. The rebuilding of the Cleuson-Dixence penstock took 4 ½ years, involving 600 people working around the clock, 7 days a week.

VISITS / CONTACTS

43From the power of the mountains to the power of men, experience the story of electricity !

At the Bieudron and Nendaz hydroelectric power plants, buried underneath the mountain, turbines are driven by the water from the Grande Dixence lake.

Come and discover these constructions, which are unique in the world, their history and their features.

Guided visits available, must be prebookedOpen from January to December, working days onlyDuration of the visit : 1 hour 30 minutes

CONTACT INFORMATION

Grande Dixence SA+41 27 328 43 [email protected]

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cleuson - dxei nce

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