I have seen a tidal dam and energy station in the area they are speaking of. This must be something different than a tidal dam.

A better alternative in that area than wind turbines.

http://www.edgenewengland.com/index.php?ch=technology&sc=science&sc2=&sc3=&id=109297

another article dated 2006

http://www.workingwaterfront.com/articles/Tidal-power-proposals-return-to-eastern-Maine/11341/printer-friendly/

an excerpt

"The available tidal energy potential for the Minas Passage, Nova Scotia, is over 1 GW. Harnessing just 15% of the available tidal energy resource base would generate enough electricity to power about 120,000 Canadian homes..."