Wave energy remains one of the least-exploited clean energy options, with huge potential as part of a green energy grid. Finland's AW Energy is preparing to field a contender at scale – the Waveroller – which sits on the sea bed generating up to 1 MW.

Wave power does not seem to be a super fast-moving sector. We've seen plenty of fascinating ideas in this space, from jetty-mounted pump arms, to telescoping barrels, to elastic sea-bed flappers, and two different flavors of artificial blowhole generators, to name just a few, but nearly all remain at a pilot/prototype stage.

Which is annoying; wave energy is super-reliable, super-predictable, and available 24/7 at coastlines worldwide, which is right where a lot of people tend to like living. It should be a dream addition to the renewable energy mix. But it's moving so slowly that you have to wonder where the holdup is.

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