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The 'Annapolis Royal Generating Station' is an 18-MW tidal power plant 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 Annapolis Royal facility was partly prompted by the promise of federal funding for this alternative energy project, as well as the provincial Department of Transportation's requirement to replace an aging steel truss bridge over the river between Annapolis Royal and Granville Ferry.
The resulting rock-filled dam carries Trunk 1 across the river, as well as housing the power house and sluice gates.
The project has had mixed results. While effectively generating electricity, the dam across the river restricting water flow (to allow the tidal difference to accumulate every 6 hours) has resulted in increased river bank erosion on both the upstream and downstream sides.
The dam has also trapped marine life, including a case in August, 2004 when a mature Humpback whale swam through the open sluice gate at slack tide, ending up trapped for several days in the upper part of the river before eventually finding its way out to the Annapolis Basin (it was nicknamed ''"Sluice"'').
The body of an immature Humpback whale was discovered in spring 2007 near the head of tide in the river at Bridgetown. A post-mortem was inconclusive but suggested the whale had become trapped in the river after following fish through the sluice gates.