[Updated March 27, 2024]

Following a government decision and the reinforced vigipirate plan, guided tours of the Guerlédan hydroelectric dam are canceled until further notice.

Located in the center of Brittany, the Guerlédan hydroelectric dam offers tours to the public for a true immersion in the heart of the first of renewable energies!

With its retention capacity of 51 million m3, the Guerlédan dam provides electricity in a very short time and thus responds to peaks in consumption on the network.    


The EDF Guerlédan dam is:  

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

The advantages of the visit

Access to the heart of the production plant and the bowels of the dam.

The interior route: 

  • Direct access to the engine room, the heart of electricity production at the Guerlédan hydraulic plant.  
  • A bird's eye view of the engine room. 
  • An exhibition of archive photos.  
  • The old control room kept as is.  
  • An interpretation space on all areas of intervention of the EDF team at the Guerlédan dam, from operation and maintenance to water management, thanks to models and infographics.  

The exterior route: 

  • A close-up view of the Guerlédan dam.
  • An immersion in the history of the construction of the dam and its emptying over the century.  
  • Crossing a gallery inside the dam.  

Regulatory conditions to be respected:

  • At the time of registration: Obligation to take the surnames, first names and date of birth of all people as well as a telephone number.
  • Upon arrival on site: check of valid national identity cards or passports required.
  • Photos and bags prohibited.
  • No dogs allowed.
  • Closed, flat shoes.
  • Visit not authorized for children under 8 years old.
  • No access for people with reduced mobility.
  • The visit to the tunnel gallery (at the end of the visit) is contraindicated for claustrophobic people. 

Visit by reservation at the Pontivy Community Tourist Office or the Guerlédan Lake Electrothèque.

Places limits.

From 8 years.

Duration 1h15.

Departure from the Guerlédan dam.

Opening hours from July 01 to August 31, 2024
Tuesday Open
Wednesday Open
Thursday Open
Friday Open
Opening hours from October 21 to November 02, 2024
Tuesday Open from 10:30 a.m. to 11:45 p.m. and from 14:30 p.m. to 15:45 p.m.
Thursday Open from 10:30 a.m. to 11:45 p.m. and from 14:30 p.m. to 15:45 p.m.
Pontivy Community Tourist Office

Benoit, Marion, Leïla, Alexandre and Hervé, guides at the Pontivy Community tourist office, are waiting for you for great visits to the EDF hydroelectric dam on Lake Guerlédan!

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