Operational Tidal Schemes

La Rance
The Rance Tidal Power Station is the world's first tidal power station. The facility is located on the estuary of the Rance River, in Brittany, France. Opened on the 26th November 1966, it is currently operated by Electricite de France (EDF), and is the largest tidal power station in the world, in terms of installed capacity. The annual output is approximately 600 GWh with a peak rating of 240 Megawatts, generated by its 24 turbines . The barrage is 750 m (2,461 ft) long, from Brebis point in the west to briantais point in the east. The power plant portion of the barrage is 332.5 m (1,091 ft) long. The tidal basin measures 22.5 km2 (9 sq mi). 

The Annapolis Royal Generating Station is a 20 MW tidal power station located on the Annapolis River immediately upstream from the town of Annapolis Royal, Nova Scotia, Canada. It is the only tidal generating station in North America.  The generating station harnesses the tidal difference created by the large tides in the Annapolis Basin, a sub-basin of the Bay of Fundy.  Opened in 1984, the Annapolis Royal Generating Station was constructed by Nova Scotia Power Corporation, which was, at the time, a provincial government Crown Corporation that was frequently used to socially benefit various areas in the province.

Tidal harnesses to generate electricity had been under discussion for the Bay of Fundy and its various sub-basins for several decades. The decision to build the facility was partly prompted by the promise of federal funding for this alternative energy project, as well as the provincial requirement of the Department of Transportation to replace an aging steel truss bridge over the river between Annapolis Royal and Granville Ferry. The resulting rock-filled barrage carries Trunk Road 1 across the river, as well as housing the power house and sluice gates.

Tidal Schemes Under Construction

Sihwa Lake Tidal Power Station is a large tidal power station currently under construction. Due to be completed in August 2010, it will operate with a total power output capacity of 254 MW, surpassing the 240 MW Rance Tidal Power Station to become the world's largest tidal power installation.

The tidal barrage makes use of a seawall constructed in 1994 for flood mitigation and agricultural purposes. Ten 25.4 MW submerged bulb turbines are driven in an unpumped flood generation scheme; power is generated on tidal inflows only and the outflow is sluiced away. This slightly unconventional and relatively inefficient approach has been chosen to balance a complex mix of existing land use, water use, conservation, environmental and power generation considerations.

Proposed Tidal Schemes

It is estimated that a tidal power scheme in the Severn Estuary, which is the largest tidal range in the world, could satisfy up to 5% of the UK's electricity needs.

A government led feasibility study began at the start of 2008 and is due to report in 2010.  Currently, five schemes have been shortlisted: three are tidal barrages and two are tidal lagoons.  One of the barrage schemes has an installed capacity of 8.6 GW and has the potential to deliver 16.8 TWh (terawatt hours) of electricity a year.

For more information visit the project website.


For more information visit the project website.


For more information click here.


For more information click here.