Located right in the centre of Brittany, the Guerlédan hydroelectric dam is open to the public for tours that take you right to the heart of the world's leading renewable energy source!

Government decision 15-10-23

Following the Government's decision to declare the "Emergency Attack" level as part of the Vigipirate plan, please take note of the EDF Hydro decisions for the Lac de Guerlédan dam site: suspension of external visits from the general public as part of our industrial tourism initiatives. Guided tours are therefore cancelled.

With its storage capacity of 51 million m3, the Guerlédan dam supplies electricity at very short notice, responding to peaks in consumption on the grid. 


The EDF Guerlédan dam is : 

  • A century-old dam
  • A major industrial heritage in the history of electrification in Brittany 
  • The powerful story of a titanic project (1923-1930) documented by numerous archive photos 

Tour highlights

Access to the heart of the power station and the bowels of the dam.

The inner journey : 

  • Direct access to the machine room, the heart of electricity production at the Guerlédan hydroelectric plant.  
  • A bird's eye view of the engine room. 
  • An exhibition of archive photos.  
  • The old control room has been kept as it was.  
  • An interpretation area covering all the areas in which the EDF team works on the Guerlédan dam, from operation and maintenance to water management, using models and computer graphics.  

The outdoor course : 

  • A close-up view of the Guerlédan dam.
  • Immerse yourself in the history of the dam's construction and emptying over the course of the century.  
  • Crossing a gallery inside the dam.  

Regulatory requirements:

  • At the time of registration: All names, first names, dates of birth and telephone numbers must be provided.
  • On arrival at the site: compulsory check of valid national identity cards or passports.
  • Photos and bags prohibited.
  • No dogs allowed.
  • Closed-toe and flat shoes.
  • Under-8s are not permitted.
  • No access for people with reduced mobility.
  • Visitors with claustrophobia are advised not to visit the tunnel gallery (at the end of the tour). 

Visits must be booked in advance with the Pontivy Communauté Tourist Office or the Électrothèque du lac de Guerlédan.

Places are limited.

From age 8.

Running time: 1 hour 15 minutes.

Departure from the Guerlédan dam.

Pontivy Communauté Tourist Office

Benoit, Marion, Leïla, Alexandre and Hervé, guides at the Pontivy Communauté tourist office, are waiting to take you on a tour of the EDF hydroelectric dam at Lac de Guerlédan!

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