Roger wrote:

Last time this came up, another site in the north was suggested - I
can't remember if it was the Solway, or Morecambe bay, one of those.
But when I dug it turned out the tides were a nice 6 hours away from the
Severn. Which means between them they have a steady generation rate.

The Severn is undoubtedly the best site but more than one oppo is needed
both because it will take several other sites just to match the Severns
output and because, as at present proposed, the generators would only
work when the tide is flowing and then for only for a part of the time.

The cabling to move the power around is perhaps more of an issue.

Most of the power would be needed in England (Scotland exports power) so
going too far North would increase transmission costs but don't forget
they get tides on the East and South Coasts as well. :-)


If you can find two similar sized sites with tides 6 hours apart each
one fills in the gaps in the other's output. I don't think there are
any, apart from the Severn, in the SE of the UK with big tides and the
right time difference.

6 hours BTW - I mean 6.5 really, you want the peak flow in one to
coincide with the peak levels in the other. 2 sine waves roughly.

Andy