The ocean – which covers 70% of the earth’s surface – offers plenty of potential.
For example, it is estimated that 10% of Europe’s wave power could be produced off the coast of Scotland.
But companies developing wave and tidal energy technology need to research and test their products before dropping them in the sea.
Adam Shaw visits a research testing facility in Edinburgh, where they hope to harness the power of the wave.
If you would like to comment on this story or anything else you have seen on Future, head over to our Facebook page or message us on Twitter.