Very interesting visit to a magnificent piece of engineering.
Its a bit tricky to find if you use sat nav and the map here on TA shows the visitor centre in the wrong place.
Basically as you come over the dam east to west turn off into the carpark on the left and park up in the visitor area just...
The Rance is a special hydro-electric station, as it is based on the tidal effect. This coast of Brittany is known for the tidal effect and this station is between the see side and the lake side. Visit is free.