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The tidal range in that area is the second highest in the world, behind only that of the Bay of Fundy in Nova Scotia.
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The estuary's classic funnel shape, unique in the UK, helps give it the third highest tidal range in the world at more than 12m (39ft).
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"I think it's unfortunate that attention for tidal range has tended to focus on the Severn, it's the wrong place to start, it's too big, " he said.
BBC: UK tidal power has huge potential, say scientists
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Earlier this year, areas in the Pentland Firth and around Orkney were leased to seven companies, which aim to generate enough electricity to supply 750, 000 homes by 2020 from a range of wave and tidal devices.
BBC: Pentland Firth tidal project set for development