The UK has been thinking about tidal power in a "Severn Barrage" on the Severn river near Bristol since 1849: https://en.wikipedia.org/wiki/Severn_Barrage http

The UK has been thinking about tidal power in a "Severn Barrage" on the Severn river near Bristol since 1849: https://en.wikipedia.org/wiki/Severn_Barrage https://en.wikipedia.org/wiki/Severn_Barrage No progress in recent years though due to environmental concerns, although there is always Salter's Ducks (which is just harnessing plain wave action, not tidal): https://en.wikipedia.org/wiki/Salter%27s_duck https://en.wikipedia.org/wiki/Salter%27s_duck Sadly, seems like it also suffers from a similar lack of progress.