In spite of the high development cost of the project, the costs have now been recovered, and electricity production costs are lower than that of nuclear power generation (1.8c per kWh, versus 2.5c per kWh for nuclear).
Rance Tidal Power Plant Environmental impact
The barrage has caused progressive silting of the Rance ecosystem. Sand-eels and plaice have disappeared, though sea bass and cuttlefish have returned to the river. By definition, tides still flow in the estuary and the operators, EDF endeavours to adjust their level to minimize the biological impact.
Tourist attraction
The Rance Tidal Power Plant facility attracts approximately 200,000 visitors per year. A canal lock in the west end of the dam permits the passage of 16,000 vessels between the English Channel and the Rance. Departmental highway 168 crosses the dam and allows vehicles to travel between Dinard and Saint-Malo. There is a drawbridge where the road crosses the lock which may be raised to allow larger vessels to pass.
| Rance Tidal Power Plant | |
|---|---|
| Country |  France |
| Locale | Brittany |
| Status | Operational |
| Construction began | 26 July 1963 |
| Opening date | 26 November 1966 |
| Construction cost | ₣620 million |
| Owner(s) | Électricité de France |
| Dam and spillways | |
| Type of dam | Barrage |
| Length | 700 m (2,300 ft) |
| Reservoir | |
| Tidal range | 8 m (26 ft) |
| Power station | |
| Type | Tidal barrage |
| Turbines | 24 |
| Installed capacity | 240 MW |
| Annual generation | 600 GWh |