Companies around the world are trying to harness the power of the tides to create a renewable energy source. Canada’s Bay of Fundy is a promising place to do it because it has the highest tides in the world. But turning the tides into energy has proven to be challenging and costly.Matthew MClearn is an investigative reporter and data journalist with The Globe and Mail’s Energy, Natural Resources and Environment Team. He’s on the show to explain how tidal power works and where we’re at in its development.Questions? Comments? Ideas? Email us at thedecibel@globeandmail.com