The figures might not add up now, but the amount of untapped energy available ought to be hard to ignore. Coles and his colleagues found that tidal stream power has the potential to meet 11 percent of the UK’s current annual electricity demand, or 11.5 gigawatts. But according to the trade association Renewable UK, only six projects are fully or partially operational, producing a total of 10.6 megawatts—or less than 0.1 percent of what’s said to be possible. Further projects with a capacity of 370 megawatts have been approved, but even if built, the UK would still only be capturing roughly
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